t添加标签功能

internal/handler/pinned_libraries.go

@@ -6,6 +6,7 @@ import (
 	"github.com/gin-gonic/gin"
 
 	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/model"
 	"github.com/truewhile/MeBox/internal/service"
 )
 
@@ -13,6 +14,45 @@ type pinnedLibrariesReq struct {
 	LibraryIDs []string `json:"library_ids"`
 }
 
+type libraryTagsReq struct {
+	Tags []model.LibraryTagSet `json:"tags"`
+}
+
+func getLibraryTagsHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		uid, _ := c.Get(middleware.CtxUserID)
+		tags, err := svc.Profile.GetLibraryTags(c.Request.Context(), uid.(string))
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		if tags == nil {
+			tags = []model.LibraryTagSet{}
+		}
+		c.JSON(http.StatusOK, gin.H{"tags": tags})
+	}
+}
+
+func setLibraryTagsHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		var req libraryTagsReq
+		if err := c.ShouldBindJSON(&req); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		uid, _ := c.Get(middleware.CtxUserID)
+		tags, err := svc.Profile.SetLibraryTags(c.Request.Context(), uid.(string), req.Tags)
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		if tags == nil {
+			tags = []model.LibraryTagSet{}
+		}
+		c.JSON(http.StatusOK, gin.H{"tags": tags})
+	}
+}
+
 func getPinnedLibrariesHandler(svc *service.Container) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		uid, _ := c.Get(middleware.CtxUserID)

internal/handler/routes_authenticated_core.go

@@ -12,6 +12,8 @@ func registerAuthedUserAndLicenseRoutes(authed *gin.RouterGroup, svc *service.Co
 	authed.PATCH("/me", updateProfileHandler(svc))
 	authed.GET("/me/pinned-libraries", getPinnedLibrariesHandler(svc))
 	authed.PUT("/me/pinned-libraries", setPinnedLibrariesHandler(svc))
+	authed.GET("/me/library-tags", getLibraryTagsHandler(svc))
+	authed.PUT("/me/library-tags", setLibraryTagsHandler(svc))
 	authed.POST("/me/password", changePasswordHandler(svc))
 	authed.POST("/me/logout", logoutHandler(svc))
 	authed.GET("/me/temporary-password", temporaryPasswordHandler(svc))

internal/handler/routes_authenticated_test.go

@@ -27,6 +27,8 @@ func TestAuthenticatedRouteSurfacesAreRegistered(t *testing.T) {
 		"GET /api/me",
 		"GET /api/me/pinned-libraries",
 		"PUT /api/me/pinned-libraries",
+		"GET /api/me/library-tags",
+		"PUT /api/me/library-tags",
 		"GET /api/auth/permissions",
 		"GET /api/libraries",
 		"GET /api/media",

internal/model/library_tag.go

@@ -0,0 +1,118 @@
+package model
+
+import (
+	"encoding/json"
+	"strings"
+)
+
+// MaxLibraryTags 是单个用户可创建的标签数量上限，避免恶意写入过大的 JSON。
+const MaxLibraryTags = 50
+
+// MaxLibraryTagNameLen 是单个标签名的最大字符长度（按 rune 计数）。
+const MaxLibraryTagNameLen = 24
+
+// LibraryTagSet 是用户自定义的媒体库标签分组。
+// LibraryIDs 保存该标签下媒体库的 ID（含远程 Emby 挂载库的 embyremote~ 形式），
+// 顺序即媒体库在该标签内的展示顺序。
+type LibraryTagSet struct {
+	Name       string   `json:"name"`
+	LibraryIDs []string `json:"library_ids"`
+}
+
+// DecodeLibraryTags 解析 LibraryTags 字段，忽略损坏的数据。
+func (u *User) DecodeLibraryTags() []LibraryTagSet {
+	if u == nil || strings.TrimSpace(u.LibraryTags) == "" {
+		return nil
+	}
+	var tags []LibraryTagSet
+	if err := json.Unmarshal([]byte(u.LibraryTags), &tags); err != nil {
+		return nil
+	}
+	out := make([]LibraryTagSet, 0, len(tags))
+	for _, tag := range NormalizeLibraryTags(tags) {
+		out = append(out, tag)
+	}
+	if len(out) == 0 {
+		return nil
+	}
+	return out
+}
+
+// EncodeLibraryTags 把标签集合序列化为可写入 LibraryTags 字段的 JSON 字符串。
+// 空集合序列化为空字符串，便于用零值表达"没有标签"。
+func EncodeLibraryTags(tags []LibraryTagSet) (string, error) {
+	if len(tags) == 0 {
+		return "", nil
+	}
+	raw, err := json.Marshal(tags)
+	if err != nil {
+		return "", err
+	}
+	return string(raw), nil
+}
+
+// NormalizeLibraryTags 清洗标签集合：去空白、丢弃空名标签、去掉标签名与
+// 标签内媒体库 ID 的重复项，并把标签名重复的项合并。保持传入顺序。
+func NormalizeLibraryTags(tags []LibraryTagSet) []LibraryTagSet {
+	if len(tags) == 0 {
+		return nil
+	}
+	out := make([]LibraryTagSet, 0, len(tags))
+	indexByName := make(map[string]int, len(tags))
+	for _, tag := range tags {
+		name := TruncateLibraryTagName(tag.Name)
+		if name == "" {
+			continue
+		}
+		if len(out) >= MaxLibraryTags {
+			break
+		}
+		key := strings.ToLower(name)
+		pos, exists := indexByName[key]
+		if !exists {
+			if len(out) >= MaxLibraryTags {
+				break
+			}
+			out = append(out, LibraryTagSet{Name: name, LibraryIDs: []string{}})
+			pos = len(out) - 1
+			indexByName[key] = pos
+		}
+		seen := make(map[string]struct{}, len(out[pos].LibraryIDs))
+		for _, id := range out[pos].LibraryIDs {
+			seen[id] = struct{}{}
+		}
+		for _, id := range tag.LibraryIDs {
+			trimmed := strings.TrimSpace(id)
+			if trimmed == "" {
+				continue
+			}
+			if _, ok := seen[trimmed]; ok {
+				continue
+			}
+			seen[trimmed] = struct{}{}
+			out[pos].LibraryIDs = append(out[pos].LibraryIDs, trimmed)
+		}
+	}
+	if len(out) == 0 {
+		return nil
+	}
+	for i := range out {
+		if out[i].LibraryIDs == nil {
+			out[i].LibraryIDs = []string{}
+		}
+	}
+	return out
+}
+
+// TruncateLibraryTagName 去掉首尾空白并按 rune 截断到长度上限。
+func TruncateLibraryTagName(name string) string {
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return ""
+	}
+	runes := []rune(name)
+	if len(runes) > MaxLibraryTagNameLen {
+		runes = runes[:MaxLibraryTagNameLen]
+	}
+	return strings.TrimSpace(string(runes))
+}

internal/model/library_tag_test.go

@@ -0,0 +1,79 @@
+package model
+
+import "testing"
+
+func TestNormalizeLibraryTagsMergesDuplicatesAndTrims(t *testing.T) {
+	tags := []LibraryTagSet{
+		{Name: "  动画  ", LibraryIDs: []string{" a ", "", "b", "a"}},
+		{Name: "动画", LibraryIDs: []string{"c", "b"}},
+		{Name: "   ", LibraryIDs: []string{"x"}},
+		{Name: "电影", LibraryIDs: nil},
+	}
+	got := NormalizeLibraryTags(tags)
+	if len(got) != 2 {
+		t.Fatalf("NormalizeLibraryTags len = %d, want 2 (%#v)", len(got), got)
+	}
+	if got[0].Name != "动画" {
+		t.Fatalf("first tag name = %q, want 动画", got[0].Name)
+	}
+	want := []string{"a", "b", "c"}
+	if len(got[0].LibraryIDs) != len(want) {
+		t.Fatalf("first tag ids = %v, want %v", got[0].LibraryIDs, want)
+	}
+	for i := range want {
+		if got[0].LibraryIDs[i] != want[i] {
+			t.Fatalf("first tag ids = %v, want %v", got[0].LibraryIDs, want)
+		}
+	}
+	if got[1].Name != "电影" || got[1].LibraryIDs == nil {
+		t.Fatalf("empty tag should survive with an empty non-nil id list: %#v", got[1])
+	}
+}
+
+func TestNormalizeLibraryTagsCapsCountAndNameLength(t *testing.T) {
+	long := make([]rune, MaxLibraryTagNameLen+10)
+	for i := range long {
+		long[i] = 'x'
+	}
+	got := NormalizeLibraryTags([]LibraryTagSet{{Name: string(long)}})
+	if len(got) != 1 {
+		t.Fatalf("len = %d, want 1", len(got))
+	}
+	if runes := []rune(got[0].Name); len(runes) != MaxLibraryTagNameLen {
+		t.Fatalf("name length = %d, want %d", len(runes), MaxLibraryTagNameLen)
+	}
+
+	many := make([]LibraryTagSet, 0, MaxLibraryTags+5)
+	for i := 0; i < MaxLibraryTags+5; i++ {
+		many = append(many, LibraryTagSet{Name: string(rune('a' + i%26)) + "-" + string(rune('a'+i/26))})
+	}
+	if capped := NormalizeLibraryTags(many); len(capped) > MaxLibraryTags {
+		t.Fatalf("capped len = %d, want <= %d", len(capped), MaxLibraryTags)
+	}
+}
+
+func TestEncodeDecodeLibraryTagsRoundTrip(t *testing.T) {
+	user := &User{}
+	if encoded, err := EncodeLibraryTags(nil); err != nil || encoded != "" {
+		t.Fatalf("EncodeLibraryTags(nil) = %q, %v; want \"\", nil", encoded, err)
+	}
+	raw, err := EncodeLibraryTags([]LibraryTagSet{{Name: "动画", LibraryIDs: []string{"lib-1"}}})
+	if err != nil {
+		t.Fatalf("EncodeLibraryTags: %v", err)
+	}
+	user.LibraryTags = raw
+	decoded := user.DecodeLibraryTags()
+	if len(decoded) != 1 || decoded[0].Name != "动画" || len(decoded[0].LibraryIDs) != 1 || decoded[0].LibraryIDs[0] != "lib-1" {
+		t.Fatalf("DecodeLibraryTags = %#v", decoded)
+	}
+
+	user.LibraryTags = "{not json"
+	if decoded := user.DecodeLibraryTags(); decoded != nil {
+		t.Fatalf("corrupt payload should decode to nil, got %#v", decoded)
+	}
+
+	user.PopulateComputedFields()
+	if user.LibraryTagList != nil {
+		t.Fatalf("PopulateComputedFields should mirror DecodeLibraryTags, got %#v", user.LibraryTagList)
+	}
+}

internal/model/user.go

@@ -28,6 +28,11 @@ type User struct {
 	// PinnedLibraryIDs 存储用户置顶的媒体库 ID 列表（JSON 字符串），顺序即置顶优先级。
 	PinnedLibraryIDs  string   `gorm:"type:text" json:"-"`
 	PinnedLibraryList []string `gorm:"-" json:"pinned_library_ids,omitempty"`
+	// LibraryTags 存储用户自定义的媒体库标签分组（JSON 字符串），
+	// 形如 [{"name":"动画","library_ids":["lib-1","lib-2"]}]。标签属于用户本人，
+	// 用于在媒体库页把同一标签下的媒体库聚合到一起。
+	LibraryTags    string          `gorm:"type:text" json:"-"`
+	LibraryTagList []LibraryTagSet `gorm:"-" json:"library_tags,omitempty"`
 	// SubtitleChineseMode 是网页播放器外挂字幕的简繁转换偏好：
 	// original / simplified / traditional。
 	SubtitleChineseMode string `gorm:"size:16;not null;default:original" json:"subtitle_chinese_mode"`
@@ -103,4 +108,5 @@ func (u *User) PopulateComputedFields() {
 	}
 	u.AllowedLibraryList = u.DecodeAllowedLibraryIDs()
 	u.PinnedLibraryList = u.DecodePinnedLibraryIDs()
+	u.LibraryTagList = u.DecodeLibraryTags()
 }

internal/service/profile.go

@@ -144,6 +144,85 @@ func (p *ProfileService) SetPinnedLibraryIDs(ctx context.Context, userID string,
 	return normalized, nil
 }
 
+// GetLibraryTags returns the user's library tag groups, filtered to libraries
+// the user can still access. Empty tags are kept so an editor does not lose a
+// tag that was just created.
+func (p *ProfileService) GetLibraryTags(ctx context.Context, userID string) ([]model.LibraryTagSet, error) {
+	user, err := p.repo.User.FindByID(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+	if user == nil {
+		return nil, errors.New("user not found")
+	}
+	tags := model.NormalizeLibraryTags(user.DecodeLibraryTags())
+	if len(tags) == 0 {
+		return []model.LibraryTagSet{}, nil
+	}
+	visibility := UserDefaultMediaVisibility(ctx, p.repo, userID)
+	accessible, err := p.accessibleLibraryIDSet(ctx, visibility)
+	if err != nil {
+		return nil, err
+	}
+	for i := range tags {
+		tags[i].LibraryIDs = filterPinnedLibraryIDs(tags[i].LibraryIDs, accessible)
+		if tags[i].LibraryIDs == nil {
+			tags[i].LibraryIDs = []string{}
+		}
+	}
+	return tags, nil
+}
+
+// SetLibraryTags persists the user's library tag groups after dropping
+// inaccessible libraries. A library belongs to at most one tag: the first tag
+// that lists it wins, so the saved state always matches the tab UI.
+func (p *ProfileService) SetLibraryTags(ctx context.Context, userID string, tags []model.LibraryTagSet) ([]model.LibraryTagSet, error) {
+	if userID == "" {
+		return nil, errors.New("missing user id")
+	}
+	user, err := p.repo.User.FindByID(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+	if user == nil {
+		return nil, errors.New("user not found")
+	}
+	visibility := UserDefaultMediaVisibility(ctx, p.repo, userID)
+	accessible, err := p.accessibleLibraryIDSet(ctx, visibility)
+	if err != nil {
+		return nil, err
+	}
+	normalized := model.NormalizeLibraryTags(tags)
+	if len(normalized) > model.MaxLibraryTags {
+		normalized = normalized[:model.MaxLibraryTags]
+	}
+	claimed := make(map[string]struct{})
+	for i := range normalized {
+		filtered := make([]string, 0, len(normalized[i].LibraryIDs))
+		for _, id := range filterPinnedLibraryIDs(normalized[i].LibraryIDs, accessible) {
+			if _, taken := claimed[id]; taken {
+				continue
+			}
+			claimed[id] = struct{}{}
+			filtered = append(filtered, id)
+		}
+		normalized[i].LibraryIDs = filtered
+	}
+	raw, err := model.EncodeLibraryTags(normalized)
+	if err != nil {
+		return nil, err
+	}
+	if err := p.repo.User.UpdateFields(ctx, userID, map[string]any{
+		"library_tags": raw,
+	}); err != nil {
+		return nil, err
+	}
+	if normalized == nil {
+		normalized = []model.LibraryTagSet{}
+	}
+	return normalized, nil
+}
+
 func (p *ProfileService) accessibleLibraryIDSet(ctx context.Context, visibility MediaVisibility) (map[string]struct{}, error) {
 	libs, err := p.repo.Library.List(ctx)
 	if err != nil {

internal/service/profile_library_tags_test.go

@@ -0,0 +1,150 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"go.uber.org/zap"
+)
+
+func TestProfileLibraryTagsFiltersInaccessibleAndKeepsOneTagPerLibrary(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.User{}, &model.Library{}, &model.EmbyMount{}); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	svc := NewProfileService(zap.NewNop(), repos)
+
+	user := &model.User{Username: "viewer", PasswordHash: "hash", Role: "user"}
+	if err := repos.User.Create(t.Context(), user); err != nil {
+		t.Fatal(err)
+	}
+	libA := &model.Library{Name: "Movies", Path: "/media/movies", Type: "movie", Enabled: true}
+	libB := &model.Library{Name: "TV", Path: "/media/tv", Type: "tv", Enabled: true}
+	libHidden := &model.Library{Name: "Adult", Path: "/media/adult", Type: "movie", Enabled: true}
+	for _, lib := range []*model.Library{libA, libB, libHidden} {
+		if err := repos.Library.Create(t.Context(), lib); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := repos.User.UpdateFields(t.Context(), user.ID, map[string]any{
+		"allowed_library_ids": `["` + libA.ID + `","` + libB.ID + `"]`,
+	}); err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := svc.SetLibraryTags(t.Context(), user.ID, []model.LibraryTagSet{
+		{Name: " 热门 ", LibraryIDs: []string{libA.ID, libHidden.ID, "missing", libA.ID}},
+		{Name: "热门", LibraryIDs: []string{libB.ID, libA.ID}},
+		{Name: "", LibraryIDs: []string{libB.ID}},
+	})
+	if err != nil {
+		t.Fatalf("SetLibraryTags: %v", err)
+	}
+	if len(got) != 1 {
+		t.Fatalf("SetLibraryTags returned %d tags, want 1 (%#v)", len(got), got)
+	}
+	if got[0].Name != "热门" {
+		t.Fatalf("tag name = %q, want 热门", got[0].Name)
+	}
+	// libA 已在第一个标签里占位，第二个标签里的 libA 应被丢弃。
+	want := []string{libA.ID, libB.ID}
+	if len(got[0].LibraryIDs) != len(want) {
+		t.Fatalf("tag ids = %v, want %v", got[0].LibraryIDs, want)
+	}
+	for i := range want {
+		if got[0].LibraryIDs[i] != want[i] {
+			t.Fatalf("tag ids = %v, want %v", got[0].LibraryIDs, want)
+		}
+	}
+
+	loaded, err := svc.GetLibraryTags(t.Context(), user.ID)
+	if err != nil {
+		t.Fatalf("GetLibraryTags: %v", err)
+	}
+	if len(loaded) != 1 || loaded[0].Name != "热门" || len(loaded[0].LibraryIDs) != len(want) {
+		t.Fatalf("GetLibraryTags = %#v, want one tag with %v", loaded, want)
+	}
+}
+
+func TestProfileLibraryTagsKeepsEmptyTagAndMountedEmby(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.User{}, &model.Library{}, &model.EmbyMount{}); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	svc := NewProfileService(zap.NewNop(), repos)
+
+	user := &model.User{Username: "viewer", PasswordHash: "hash", Role: "user"}
+	if err := repos.User.Create(t.Context(), user); err != nil {
+		t.Fatal(err)
+	}
+	mount := &model.EmbyMount{
+		AccountID:      "acct-1",
+		RemoteViewID:   "view-42",
+		RemoteViewName: "Remote Movies",
+		Enabled:        true,
+	}
+	if err := repos.EmbyMount.Create(t.Context(), mount); err != nil {
+		t.Fatal(err)
+	}
+	remoteID := EncodeEmbyRemoteID(mount.ID, mount.RemoteViewID)
+
+	got, err := svc.SetLibraryTags(t.Context(), user.ID, []model.LibraryTagSet{
+		{Name: "远程", LibraryIDs: []string{remoteID, "embyremote~missing~view"}},
+		{Name: "以后再用", LibraryIDs: []string{}},
+	})
+	if err != nil {
+		t.Fatalf("SetLibraryTags: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("SetLibraryTags = %#v, want 2 tags", got)
+	}
+	if len(got[0].LibraryIDs) != 1 || got[0].LibraryIDs[0] != remoteID {
+		t.Fatalf("remote tag ids = %v, want [%s]", got[0].LibraryIDs, remoteID)
+	}
+	if got[1].Name != "以后再用" || len(got[1].LibraryIDs) != 0 {
+		t.Fatalf("empty tag should survive as-is, got %#v", got[1])
+	}
+
+	loaded, err := svc.GetLibraryTags(t.Context(), user.ID)
+	if err != nil {
+		t.Fatalf("GetLibraryTags: %v", err)
+	}
+	if len(loaded) != 2 || len(loaded[1].LibraryIDs) != 0 {
+		t.Fatalf("GetLibraryTags = %#v, want the empty tag preserved", loaded)
+	}
+}
+
+func TestProfileLibraryTagsEmptyStateReturnsEmptySlice(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.User{}, &model.Library{}, &model.EmbyMount{}); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	svc := NewProfileService(zap.NewNop(), repos)
+
+	user := &model.User{Username: "viewer", PasswordHash: "hash", Role: "user"}
+	if err := repos.User.Create(t.Context(), user); err != nil {
+		t.Fatal(err)
+	}
+	if tags, err := svc.GetLibraryTags(t.Context(), user.ID); err != nil || tags == nil || len(tags) != 0 {
+		t.Fatalf("GetLibraryTags = %#v, %v; want empty non-nil slice", tags, err)
+	}
+	if tags, err := svc.SetLibraryTags(t.Context(), user.ID, nil); err != nil || tags == nil || len(tags) != 0 {
+		t.Fatalf("SetLibraryTags(nil) = %#v, %v; want empty non-nil slice", tags, err)
+	}
+}

web/src/api/profile.ts

@@ -1,5 +1,5 @@
 import { api } from './client'
-import type { User } from '../types'
+import type { LibraryTagSet, User } from '../types'
 
 export const profileAPI = {
   get: () => api.get<User>('/me').then((r) => r.data),
@@ -21,6 +21,12 @@ export const profileAPI = {
   setPinnedLibraries: (libraryIds: string[]) =>
     api.put<{ library_ids: string[] }>('/me/pinned-libraries', { library_ids: libraryIds }).then((r) => r.data.library_ids ?? []),
 
+  getLibraryTags: () =>
+    api.get<{ tags: LibraryTagSet[] | null }>('/me/library-tags').then((r) => r.data.tags ?? []),
+
+  setLibraryTags: (tags: LibraryTagSet[]) =>
+    api.put<{ tags: LibraryTagSet[] | null }>('/me/library-tags', { tags }).then((r) => r.data.tags ?? []),
+
   adminUpdateRole: (id: string, role: 'admin' | 'user') =>
     api.patch<User>(`/admin/users/${id}/role`, { role }).then((r) => r.data),
 }

web/src/components/LibraryTagBar.tsx

@@ -0,0 +1,164 @@
+import { useEffect, useMemo, useRef, useState } from 'react'
+import { Layers, Plus, Settings2, X } from 'lucide-react'
+
+import { MAX_LIBRARY_TAGS } from '../utils/libraryTags'
+import type { LibraryTagTab } from '../utils/libraryTags'
+
+/**
+ * 媒体库标签栏：固定「全部」+ 每个标签一个页签，选中后只展示该标签下的媒体库。
+ * 只是管理员/普通用户都能用的展示层过滤，不改动媒体库本身。
+ */
+export function LibraryTagBar({
+  tabs,
+  selectedTagId,
+  onSelect,
+  onCreate,
+  onManage,
+  manageLabel = '管理标签',
+  showCreate = true,
+  busy = false,
+}: {
+  tabs: LibraryTagTab[]
+  selectedTagId: string
+  onSelect: (tagId: string) => void
+  onCreate?: (name: string) => void
+  onManage?: () => void
+  manageLabel?: string
+  showCreate?: boolean
+  busy?: boolean
+}) {
+  const [creating, setCreating] = useState(false)
+  const [draft, setDraft] = useState('')
+  const inputRef = useRef<HTMLInputElement | null>(null)
+  // 同一帧内 blur 与 Enter 都可能触发提交：用一个标记保证只提交一次。
+  const submittedRef = useRef(false)
+
+  useEffect(() => {
+    if (creating) {
+      submittedRef.current = false
+      inputRef.current?.focus()
+    }
+  }, [creating])
+
+  const hasTags = useMemo(() => tabs.some((tab) => !tab.isAll), [tabs])
+
+  const submit = () => {
+    if (submittedRef.current) return
+    submittedRef.current = true
+    const name = draft.trim()
+    setDraft('')
+    setCreating(false)
+    if (!name) return
+    onCreate?.(name)
+  }
+
+  const cancel = () => {
+    submittedRef.current = true
+    setDraft('')
+    setCreating(false)
+  }
+
+  return (
+    <div className="flex flex-wrap items-center gap-2 border-b border-[var(--app-border)] pb-3">
+      <div className="flex flex-wrap items-center gap-1.5">
+        {tabs.map((tab) => {
+          const active = tab.id === selectedTagId
+          return (
+            <button
+              key={tab.id}
+              type="button"
+              onClick={() => onSelect(tab.id)}
+              aria-pressed={active}
+              className={`inline-flex items-center gap-1.5 rounded-xl border px-3 py-1.5 text-xs font-bold transition-colors ${
+                active
+                  ? 'border-brand-500/60 bg-brand-500/10 text-brand-600'
+                  : 'border-[var(--app-border)] bg-[var(--app-panel-soft)] text-[var(--app-subtle)] hover:border-brand-500/40 hover:text-[var(--app-text)]'
+              }`}
+              title={tab.isAll ? '显示全部媒体库' : `只看「${tab.name}」标签下的媒体库`}
+            >
+              {tab.isAll && <Layers size={13} />}
+              <span className="max-w-[8rem] truncate">{tab.name}</span>
+              <span className={`font-mono text-[10px] ${active ? 'text-brand-500' : 'text-[var(--app-muted)]'}`}>
+                {tab.count}
+              </span>
+            </button>
+          )
+        })}
+      </div>
+
+      {(showCreate || onManage) && (
+        <div className="flex flex-wrap items-center gap-1.5">
+          {showCreate && onCreate && (creating || !hasTags) && (
+            <div className="inline-flex items-center gap-1 rounded-xl border border-[var(--app-border)] bg-[var(--app-panel-soft)] px-2 py-1">
+              <input
+                ref={inputRef}
+                value={draft}
+                onChange={(event) => setDraft(event.target.value)}
+                onKeyDown={(event) => {
+                  if (event.key === 'Enter') {
+                    event.preventDefault()
+                    submit()
+                  }
+                  if (event.key === 'Escape') {
+                    event.preventDefault()
+                    setDraft('')
+                    setCreating(false)
+                  }
+                }}
+                onBlur={() => submit()}
+                maxLength={24}
+                placeholder="新标签名"
+                className="h-6 w-24 bg-transparent text-xs font-semibold text-[var(--app-text)] outline-none placeholder:text-[var(--app-muted)]"
+                title={`最多 24 个字，当前最多 ${MAX_LIBRARY_TAGS} 个标签`}
+              />
+              <button
+                type="button"
+                onMouseDown={(event) => event.preventDefault()}
+                onClick={submit}
+                disabled={busy || !draft.trim()}
+                className="rounded-lg p-1 text-brand-500 transition-colors hover:bg-[var(--app-hover)] disabled:opacity-40"
+                title="创建标签"
+              >
+                <Plus size={13} />
+              </button>
+              <button
+                type="button"
+                onMouseDown={(event) => event.preventDefault()}
+                onClick={cancel}
+                className="rounded-lg p-1 text-[var(--app-muted)] transition-colors hover:bg-[var(--app-hover)]"
+                title="取消"
+              >
+                <X size={13} />
+              </button>
+            </div>
+          )}
+
+          {showCreate && onCreate && !creating && hasTags && (
+            <button
+              type="button"
+              onClick={() => setCreating(true)}
+              disabled={busy || tabs.length - 1 >= MAX_LIBRARY_TAGS}
+              className="inline-flex items-center gap-1 rounded-xl border border-dashed border-[var(--app-border)] px-2.5 py-1.5 text-xs font-bold text-[var(--app-muted)] transition-colors hover:border-brand-500/50 hover:text-brand-500 disabled:opacity-40"
+              title="新建标签"
+            >
+              <Plus size={13} />
+              <span>新建标签</span>
+            </button>
+          )}
+
+          {onManage && (
+            <button
+              type="button"
+              onClick={onManage}
+              className="inline-flex items-center gap-1 rounded-xl border border-[var(--app-border)] bg-[var(--app-panel-soft)] px-2.5 py-1.5 text-xs font-bold text-[var(--app-subtle)] transition-colors hover:border-brand-500/40 hover:text-brand-500"
+              title="重命名 / 删除标签，调整标签下的媒体库"
+            >
+              <Settings2 size={13} />
+              <span>{manageLabel}</span>
+            </button>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}

web/src/components/ManageLibraryTagsDialogView.tsx

@@ -0,0 +1,304 @@
+import { useEffect, useMemo, useState } from 'react'
+import { Check, Loader2, Pencil, Plus, Tag, Trash2, X } from 'lucide-react'
+import toast from 'react-hot-toast'
+
+import { confirmAction } from './confirmAction'
+import type { Library } from '../types'
+import { MAX_LIBRARY_TAGS, normalizeTagName, tagNameError, type LibraryTag } from '../utils/libraryTags'
+
+export type ManageLibraryTagsDialogProps = {
+  tags: LibraryTag[]
+  libraries: Library[]
+  saving: boolean
+  onCreate: (name: string) => Promise<string>
+  onRename: (from: string, to: string) => Promise<void>
+  onRemove: (name: string) => Promise<void>
+  onAssign: (libraryId: string, tagName: string) => Promise<void>
+  onClose: () => void
+}
+
+/**
+ * 标签管理对话框：左侧维护标签（新建 / 重命名 / 删除），右侧把每个媒体库归入
+ * 某个标签。一个媒体库同时只属于一个标签，未选择即为「未分类」。
+ */
+export function ManageLibraryTagsDialogView({
+  tags,
+  libraries,
+  saving,
+  onCreate,
+  onRename,
+  onRemove,
+  onAssign,
+  onClose,
+}: ManageLibraryTagsDialogProps) {
+  const [draftName, setDraftName] = useState('')
+  const [renaming, setRenaming] = useState('')
+  const [renameDraft, setRenameDraft] = useState('')
+  const [busyLibrary, setBusyLibrary] = useState('')
+
+  useEffect(() => {
+    const onKeyDown = (event: KeyboardEvent) => {
+      if (event.key === 'Escape') onClose()
+    }
+    window.addEventListener('keydown', onKeyDown)
+    return () => window.removeEventListener('keydown', onKeyDown)
+  }, [onClose])
+
+  const tagByLibrary = useMemo(() => {
+    const map = new Map<string, string>()
+    for (const tag of tags) {
+      for (const id of tag.library_ids) {
+        if (!map.has(id)) map.set(id, tag.name)
+      }
+    }
+    return map
+  }, [tags])
+
+  const handleCreate = async () => {
+    const error = tagNameError(draftName, tags)
+    if (error) {
+      toast.error(error)
+      return
+    }
+    if (tags.length >= MAX_LIBRARY_TAGS) {
+      toast.error(`最多 ${MAX_LIBRARY_TAGS} 个标签`)
+      return
+    }
+    const created = await onCreate(normalizeTagName(draftName))
+    if (created) {
+      setDraftName('')
+      toast.success(`标签「${created}」已创建`)
+    } else {
+      toast.error('标签创建失败')
+    }
+  }
+
+  const handleRename = async (from: string) => {
+    const error = tagNameError(renameDraft, tags, from)
+    if (error) {
+      toast.error(error)
+      return
+    }
+    await onRename(from, renameDraft)
+    setRenaming('')
+    setRenameDraft('')
+  }
+
+  const handleRemove = async (tag: LibraryTag) => {
+    const confirmed = await confirmAction({
+      title: '删除标签',
+      message: `确定删除标签「${tag.name}」？\n媒体库本身不会被删除，只会回到「未分类」。`,
+      confirmText: '删除',
+    })
+    if (!confirmed) return
+    await onRemove(tag.name)
+  }
+
+  const handleAssign = async (library: Library, tagName: string) => {
+    setBusyLibrary(library.id)
+    try {
+      await onAssign(library.id, tagName)
+    } finally {
+      setBusyLibrary('')
+    }
+  }
+
+  return (
+    <div
+      className="fixed inset-0 z-[100] flex items-center justify-center bg-black/35 p-2 backdrop-blur-sm sm:p-4"
+      onClick={onClose}
+    >
+      <div
+        role="dialog"
+        aria-modal="true"
+        className="flex h-[calc(100dvh-1rem)] w-full max-w-4xl flex-col overflow-hidden rounded-2xl border border-white/70 bg-[var(--app-panel)] shadow-2xl sm:h-[80vh] sm:rounded-3xl"
+        onClick={(event) => event.stopPropagation()}
+      >
+        <div className="flex items-center justify-between border-b border-[var(--app-border)] px-4 py-3 sm:px-6 sm:py-4">
+          <div className="flex items-center gap-2">
+            <Tag size={18} className="text-brand-500" />
+            <h3 className="font-display text-base font-bold text-[var(--app-text)] sm:text-lg">管理标签</h3>
+            {saving && <Loader2 size={14} className="animate-spin text-[var(--app-muted)]" />}
+          </div>
+          <button
+            type="button"
+            onClick={onClose}
+            className="rounded-xl p-1.5 text-[var(--app-muted)] transition hover:bg-[var(--app-hover)] hover:text-[var(--app-text)]"
+            title="关闭"
+          >
+            <X size={20} />
+          </button>
+        </div>
+
+        <div className="grid flex-1 grid-cols-1 gap-4 overflow-hidden p-3 sm:p-6 md:grid-cols-[minmax(0,1fr)_minmax(0,1.3fr)]">
+          <section className="flex min-h-0 flex-col gap-3">
+            <h4 className="text-xs font-bold uppercase tracking-widest text-[var(--app-muted)]">标签</h4>
+            <div className="flex items-center gap-1.5">
+              <input
+                value={draftName}
+                onChange={(event) => setDraftName(event.target.value)}
+                onKeyDown={(event) => {
+                  if (event.key === 'Enter') {
+                    event.preventDefault()
+                    void handleCreate()
+                  }
+                }}
+                maxLength={24}
+                placeholder="新建标签名"
+                className="input-base !py-2 text-sm"
+              />
+              <button
+                type="button"
+                onClick={() => void handleCreate()}
+                disabled={saving || !draftName.trim()}
+                className="btn-outline shrink-0 !px-3 !py-2 text-xs"
+                title="创建标签"
+              >
+                <Plus size={14} />
+                新建
+              </button>
+            </div>
+
+            <div className="min-h-0 flex-1 space-y-1.5 overflow-y-auto pr-1">
+              {tags.length === 0 ? (
+                <p className="rounded-xl border border-dashed border-[var(--app-border)] px-3 py-6 text-center text-xs text-[var(--app-muted)]">
+                  还没有标签。先创建一个，再把媒体库归入其中。
+                </p>
+              ) : (
+                tags.map((tag) => (
+                  <div
+                    key={tag.name}
+                    className="flex items-center gap-2 rounded-xl border border-[var(--app-border)] bg-[var(--app-panel-soft)] px-2.5 py-2"
+                  >
+                    {renaming === tag.name ? (
+                      <>
+                        <input
+                          autoFocus
+                          value={renameDraft}
+                          onChange={(event) => setRenameDraft(event.target.value)}
+                          onKeyDown={(event) => {
+                            if (event.key === 'Enter') {
+                              event.preventDefault()
+                              void handleRename(tag.name)
+                            }
+                            if (event.key === 'Escape') {
+                              setRenaming('')
+                              setRenameDraft('')
+                            }
+                          }}
+                          maxLength={24}
+                          className="min-w-0 flex-1 rounded-lg border border-[var(--app-border)] bg-[var(--app-panel)] px-2 py-1 text-xs font-semibold text-[var(--app-text)] outline-none focus:border-brand-500"
+                        />
+                        <button
+                          type="button"
+                          onClick={() => void handleRename(tag.name)}
+                          className="rounded-lg p-1 text-brand-500 transition-colors hover:bg-[var(--app-hover)]"
+                          title="保存名称"
+                        >
+                          <Check size={14} />
+                        </button>
+                        <button
+                          type="button"
+                          onClick={() => {
+                            setRenaming('')
+                            setRenameDraft('')
+                          }}
+                          className="rounded-lg p-1 text-[var(--app-muted)] transition-colors hover:bg-[var(--app-hover)]"
+                          title="取消"
+                        >
+                          <X size={14} />
+                        </button>
+                      </>
+                    ) : (
+                      <>
+                        <span
+                          className="min-w-0 flex-1 truncate text-sm font-bold text-[var(--app-text)]"
+                          title={tag.name}
+                        >
+                          {tag.name}
+                        </span>
+                        <span className="shrink-0 font-mono text-[10px] text-[var(--app-muted)]">
+                          {tag.library_ids.length}
+                        </span>
+                        <button
+                          type="button"
+                          onClick={() => {
+                            setRenaming(tag.name)
+                            setRenameDraft(tag.name)
+                          }}
+                          className="rounded-lg p-1 text-[var(--app-muted)] transition-colors hover:bg-[var(--app-hover)] hover:text-brand-500"
+                          title="重命名"
+                        >
+                          <Pencil size={13} />
+                        </button>
+                        <button
+                          type="button"
+                          onClick={() => void handleRemove(tag)}
+                          className="rounded-lg p-1 text-[var(--app-muted)] transition-colors hover:bg-[var(--app-hover)] hover:text-red-500"
+                          title="删除标签"
+                        >
+                          <Trash2 size={13} />
+                        </button>
+                      </>
+                    )}
+                  </div>
+                ))
+              )}
+            </div>
+          </section>
+
+          <section className="flex min-h-0 flex-col gap-3 border-t border-[var(--app-border)] pt-4 md:border-l md:border-t-0 md:pl-4 md:pt-0">
+            <h4 className="text-xs font-bold uppercase tracking-widest text-[var(--app-muted)]">
+              媒体库归类（{libraries.length}）
+            </h4>
+            <div className="min-h-0 flex-1 space-y-1.5 overflow-y-auto pr-1">
+              {libraries.length === 0 ? (
+                <p className="rounded-xl border border-dashed border-[var(--app-border)] px-3 py-6 text-center text-xs text-[var(--app-muted)]">
+                  暂无可归类的媒体库。
+                </p>
+              ) : (
+                libraries.map((library) => (
+                  <div
+                    key={library.id}
+                    className="flex items-center gap-2 rounded-xl border border-[var(--app-border)] bg-[var(--app-panel-soft)] px-2.5 py-2"
+                  >
+                    <span
+                      className="min-w-0 flex-1 truncate text-xs font-semibold text-[var(--app-text)]"
+                      title={library.name}
+                    >
+                      {library.name}
+                    </span>
+                    {busyLibrary === library.id && (
+                      <Loader2 size={13} className="shrink-0 animate-spin text-[var(--app-muted)]" />
+                    )}
+                    <select
+                      value={tagByLibrary.get(library.id) ?? ''}
+                      disabled={saving || busyLibrary === library.id}
+                      onChange={(event) => void handleAssign(library, event.target.value)}
+                      className="input-base h-8 w-32 shrink-0 !py-0 text-xs"
+                      title="选择该媒体库所属标签"
+                    >
+                      <option value="">未分类</option>
+                      {tags.map((tag) => (
+                        <option key={tag.name} value={tag.name}>
+                          {tag.name}
+                        </option>
+                      ))}
+                    </select>
+                  </div>
+                ))
+              )}
+            </div>
+          </section>
+        </div>
+
+        <div className="flex items-center justify-between gap-3 border-t border-[var(--app-border)] px-4 py-3 sm:px-6">
+          <span className="text-xs text-[var(--app-muted)]">标签按用户保存；一个媒体库同时只属于一个标签。</span>
+          <button type="button" onClick={onClose} className="btn-outline !px-4 !py-2 text-sm">
+            完成
+          </button>
+        </div>
+      </div>
+    </div>
+  )
+}

web/src/components/manageLibraryTagsDialog.tsx

@@ -0,0 +1,27 @@
+import { createRoot } from 'react-dom/client'
+
+import {
+  ManageLibraryTagsDialogView,
+  type ManageLibraryTagsDialogProps,
+} from './ManageLibraryTagsDialogView'
+
+export type OpenManageLibraryTagsDialogOptions = Omit<ManageLibraryTagsDialogProps, 'onClose'>
+
+/** 以独立根节点打开标签管理对话框，关闭后 resolve。 */
+export function openManageLibraryTagsDialog(
+  options: OpenManageLibraryTagsDialogOptions,
+): Promise<void> {
+  return new Promise((resolve) => {
+    const host = document.createElement('div')
+    document.body.appendChild(host)
+    const root = createRoot(host)
+
+    const close = () => {
+      root.unmount()
+      host.remove()
+      resolve()
+    }
+
+    root.render(<ManageLibraryTagsDialogView {...options} onClose={close} />)
+  })
+}

web/src/hooks/useLibraryTags.ts

@@ -0,0 +1,242 @@
+import { useCallback, useEffect, useRef, useState } from 'react'
+import toast from 'react-hot-toast'
+
+import {
+  ALL_TAG_ID,
+  attachLibraryToTag,
+  dedupeLibraryTags,
+  loadLibraryTags,
+  normalizeLibraryTags,
+  normalizeTagName,
+  readCachedLibraryTags,
+  readSelectedTagId,
+  resolveSelectedTagId,
+  saveLibraryTags,
+  writeCachedLibraryTags,
+  writeSelectedTagId,
+  type LibraryTag,
+} from '../utils/libraryTags'
+
+export type UseLibraryTagsResult = {
+  /** 当前用户维护的标签（顺序即标签栏顺序）。 */
+  tags: LibraryTag[]
+  /** 标签数据是否仍在首次加载中。 */
+  loading: boolean
+  /** 是否有写入在途（可用于禁用重复点击）。 */
+  saving: boolean
+  /** 接口不可用（例如旧后端）时降级为本地标签。 */
+  loadError: boolean
+  /** 当前选中的标签栏：ALL_TAG_ID 表示「全部」。 */
+  selectedTagId: string
+  setSelectedTagId: (tagId: string) => void
+  createTag: (name: string) => Promise<string>
+  renameTag: (from: string, to: string) => Promise<void>
+  removeTag: (name: string) => Promise<void>
+  /** 覆盖某个标签下的媒体库集合（保持传入顺序）。 */
+  setTagLibraries: (name: string, libraryIds: string[]) => Promise<void>
+  /** 把媒体库挂到标签下；tagName 为空表示移出所有标签。 */
+  assignLibrary: (libraryId: string, tagName: string) => Promise<void>
+}
+
+/**
+ * 媒体库标签的用户级读写。
+ *
+ * 写入采用「先乐观更新、串行提交、失败回滚」：标签是整份替换（`PUT`），
+ * 并发请求可能让旧快照最后落库，因此所有写操作串行排队，每次发送的都是
+ * 排队时的最新本地状态。接口不可用（旧后端/网络异常）时退回本地存储，
+ * 标签栏依旧可用，不会因为一次失败就让标签凭空消失。
+ */
+export function useLibraryTags(): UseLibraryTagsResult {
+  const [tags, setTags] = useState<LibraryTag[]>([])
+  const [loading, setLoading] = useState(true)
+  const [saving, setSaving] = useState(false)
+  const [loadError, setLoadError] = useState(false)
+  const [selectedTagId, setSelectedTagIdState] = useState(() => readSelectedTagId())
+
+  const tagsRef = useRef<LibraryTag[]>([])
+  const selectedRef = useRef(selectedTagId)
+  const savedRef = useRef<LibraryTag[]>([])
+  const chainRef = useRef<Promise<unknown>>(Promise.resolve())
+  const pendingRef = useRef(0)
+  // 后端没有该接口（旧版本）时退化为仅本地存储，不再反复提示保存失败。
+  const localOnlyRef = useRef(false)
+
+  useEffect(() => {
+    tagsRef.current = tags
+  }, [tags])
+
+  useEffect(() => {
+    selectedRef.current = selectedTagId
+  }, [selectedTagId])
+
+  useEffect(() => {
+    let cancelled = false
+    setLoading(true)
+    loadLibraryTags()
+      .then((rows) => {
+        if (cancelled) return
+        tagsRef.current = rows
+        savedRef.current = rows
+        setTags(rows)
+        setLoadError(false)
+      })
+      .catch((err) => {
+        if (cancelled) return
+        // 旧后端没有 /me/library-tags：用本地缓存兜底，标签栏照常可用。
+        const cached = readCachedLibraryTags()
+        tagsRef.current = cached
+        savedRef.current = cached
+        setTags(cached)
+        setLoadError(true)
+        // 接口不存在时（旧后端）只做本地读写，避免每次编辑都弹一次保存失败。
+        localOnlyRef.current = isMissingEndpoint(err)
+      })
+      .finally(() => {
+        if (!cancelled) setLoading(false)
+      })
+    return () => {
+      cancelled = true
+    }
+  }, [])
+
+  // 选中的标签可能被删除，落回「全部」以免标签栏空白。
+  useEffect(() => {
+    const resolved = resolveSelectedTagId(tags, selectedTagId)
+    if (resolved !== selectedTagId) {
+      selectedRef.current = resolved
+      setSelectedTagIdState(resolved)
+    }
+  }, [tags, selectedTagId])
+
+  const setSelectedTagId = useCallback((tagId: string) => {
+    const next = tagId && tagId !== ALL_TAG_ID ? tagId : ALL_TAG_ID
+    selectedRef.current = next
+    writeSelectedTagId(next)
+    setSelectedTagIdState(next)
+  }, [])
+
+  const mutate = useCallback((updater: (current: LibraryTag[]) => LibraryTag[]) => {
+    const rollback = savedRef.current
+    const next = dedupeLibraryTags(normalizeLibraryTags(updater(tagsRef.current)))
+    tagsRef.current = next
+    setTags(next)
+
+    pendingRef.current += 1
+    setSaving(true)
+    const task = chainRef.current.then(async () => {
+      // 发送排队时的最新本地状态：链上更早的写入已经被后面的状态取代。
+      const snapshot = tagsRef.current
+      if (localOnlyRef.current) {
+        // 已知后端不支持标签接口：只落本地缓存，不再发请求。
+        if (tagsRef.current === snapshot) savedRef.current = snapshot
+        writeCachedLibraryTags(snapshot)
+        return
+      }
+      try {
+        const saved = await saveLibraryTags(snapshot)
+        savedRef.current = saved
+        setLoadError(false)
+        if (tagsRef.current === snapshot) {
+          tagsRef.current = saved
+          setTags(saved)
+        }
+      } catch (err) {
+        if (isMissingEndpoint(err)) {
+          // 旧后端不支持标签接口：本次修改保留在本地存储，标签栏照常可用。
+          localOnlyRef.current = true
+          savedRef.current = snapshot
+          writeCachedLibraryTags(snapshot)
+          setLoadError(true)
+          return
+        }
+        // 用最后一次成功保存的状态回滚，避免前端显示一份服务端并不存在的标签。
+        tagsRef.current = rollback
+        savedRef.current = rollback
+        setTags(rollback)
+        setLoadError(true)
+        toast.error('标签保存失败，请稍后重试')
+      }
+    })
+    chainRef.current = task.catch(() => undefined)
+    return task.finally(() => {
+      pendingRef.current = Math.max(0, pendingRef.current - 1)
+      if (pendingRef.current === 0) setSaving(false)
+    })
+  }, [])
+
+  const createTag = useCallback(
+    async (name: string) => {
+      const trimmed = normalizeTagName(name)
+      if (!trimmed) return ''
+      if (tagsRef.current.some((tag) => tag.name.toLowerCase() === trimmed.toLowerCase())) {
+        return trimmed
+      }
+      await mutate((current) => [...current, { name: trimmed, library_ids: [] }])
+      return tagsRef.current.some((tag) => tag.name === trimmed) ? trimmed : ''
+    },
+    [mutate],
+  )
+
+  const renameTag = useCallback(
+    async (from: string, to: string) => {
+      const trimmed = normalizeTagName(to)
+      if (!trimmed || trimmed === from) return
+      await mutate((current) =>
+        current.map((tag) => (tag.name === from ? { ...tag, name: trimmed } : tag)),
+      )
+      // 重命名后选中项要跟着换到新名字，否则标签栏会落回「全部」。
+      if (selectedRef.current === from) setSelectedTagId(trimmed)
+    },
+    [mutate, setSelectedTagId],
+  )
+
+  const removeTag = useCallback(
+    async (name: string) => {
+      await mutate((current) => current.filter((tag) => tag.name !== name))
+      if (selectedRef.current === name) setSelectedTagId(ALL_TAG_ID)
+    },
+    [mutate, setSelectedTagId],
+  )
+
+  const setTagLibraries = useCallback(
+    async (name: string, libraryIds: string[]) => {
+      await mutate((current) =>
+        current.map((tag) => (tag.name === name ? { ...tag, library_ids: libraryIds } : tag)),
+      )
+    },
+    [mutate],
+  )
+
+  const assignLibrary = useCallback(
+    async (libraryId: string, tagName: string) => {
+      await mutate((current) => {
+        if (tagName) return attachLibraryToTag(current, libraryId, tagName)
+        return current.map((tag) => ({
+          ...tag,
+          library_ids: tag.library_ids.filter((id) => id !== libraryId),
+        }))
+      })
+    },
+    [mutate],
+  )
+
+  return {
+    tags,
+    loading,
+    saving,
+    loadError,
+    selectedTagId,
+    setSelectedTagId,
+    createTag,
+    renameTag,
+    removeTag,
+    setTagLibraries,
+    assignLibrary,
+  }
+}
+
+/** 判断错误是否说明后端没有这个接口（旧版本 / 反向代理未更新）。 */
+function isMissingEndpoint(err: unknown): boolean {
+  const status = (err as { response?: { status?: number } })?.response?.status
+  return status === 404 || status === 405 || status === 501
+}

web/src/pages/HomePage.tsx

@@ -6,6 +6,10 @@ import type { HistoryItem } from '../api/playback'
 import type { Library, Media } from '../types'
 import type { SeriesCard } from '../utils/groupSeries'
 import { fetchLibraries, peekLibraries } from '../utils/libraryCache'
+import { buildLibraryTagTabs, filterLibrariesByTag } from '../utils/libraryTags'
+import { LibraryTagBar } from '../components/LibraryTagBar'
+import { openManageLibraryTagsDialog } from '../components/manageLibraryTagsDialog'
+import { useLibraryTags } from '../hooks/useLibraryTags'
 import { usePinnedLibraries } from '../hooks/usePinnedLibraries'
 import { sortByPinnedIds } from '../utils/pinnedLibraries'
 import { partitionPreviewIDs } from '../utils/remoteEmby'
@@ -30,6 +34,7 @@ export function HomePage() {
   const [librariesLoading, setLibrariesLoading] = useState(true)
   const [historyLoading, setHistoryLoading] = useState(true)
   const { pinnedIds } = usePinnedLibraries()
+  const libraryTags = useLibraryTags()
 
   // 1. 媒体库元数据极速加载（不带 preview，毫秒级秒开首屏）。
   //    会话内已有缓存则先用缓存立即渲染，后台仍刷新一次兜底。
@@ -87,6 +92,29 @@ export function HomePage() {
 
   const sortedLibraries = useMemo(() => sortByPinnedIds(libraries, pinnedIds), [libraries, pinnedIds])
 
+  // 标签过滤只作用于展示层：选中的标签栏决定哪部分媒体库参与轮播/入口网格/内容行。
+  const effectiveTagId = libraryTags.selectedTagId
+  const tagTabs = useMemo(
+    () => buildLibraryTagTabs(sortedLibraries, libraryTags.tags),
+    [sortedLibraries, libraryTags.tags],
+  )
+  const taggedLibraries = useMemo(
+    () => filterLibrariesByTag(sortedLibraries, libraryTags.tags, effectiveTagId),
+    [sortedLibraries, libraryTags.tags, effectiveTagId],
+  )
+
+  const handleManageTags = useCallback(() => {
+    void openManageLibraryTagsDialog({
+      tags: libraryTags.tags,
+      libraries,
+      saving: libraryTags.saving,
+      onCreate: libraryTags.createTag,
+      onRename: libraryTags.renameTag,
+      onRemove: libraryTags.removeTag,
+      onAssign: libraryTags.assignLibrary,
+    })
+  }, [libraries, libraryTags])
+
   // 按需拉取卡片预览管理。同一个库可能先以 4 张封面用于入口网格，
   // 稍后需要 10 张用于内容横排，因此缓存的是已加载数量而不是简单布尔值。
   const fetchedPreviewLimitsRef = useRef<Map<string, number>>(new Map())
@@ -153,14 +181,14 @@ export function HomePage() {
 
   // 3. 首屏只预取轮播和前三行所需的预览；入口卡片进入视口后自行按批加载。
   useEffect(() => {
-    if (sortedLibraries.length === 0) return
+    if (taggedLibraries.length === 0) return
-    const carouselLibIds = sortedLibraries
+    const carouselLibIds = taggedLibraries
       .filter((l) => l.carousel_enabled === true)
       .map((l) => l.id)
-    const topRowLibIds = sortedLibraries.slice(0, 3).map((l) => l.id)
+    const topRowLibIds = taggedLibraries.slice(0, 3).map((l) => l.id)
     const shelfTargets = Array.from(new Set([...carouselLibIds, ...topRowLibIds]))
     void fetchPreviews(shelfTargets, 10)
-  }, [sortedLibraries, fetchPreviews])
+  }, [taggedLibraries, fetchPreviews])
 
   // 4. 媒体库展示行渐进流式加载：默认先检视前 3 个库，随向下滚动逐步检视后续库
   const INITIAL_ROWS = 3
@@ -171,26 +199,26 @@ export function HomePage() {
 
   const revealMoreLibraries = useCallback(() => {
     setVisibleTargetCount((prev) => {
-      if (prev >= sortedLibraries.length) return prev
+      if (prev >= taggedLibraries.length) return prev
-      return Math.min(prev + STEP_ROWS, sortedLibraries.length)
+      return Math.min(prev + STEP_ROWS, taggedLibraries.length)
     })
-  }, [sortedLibraries.length])
+  }, [taggedLibraries.length])
 
   // 随 visibleTargetCount 增加，按需触发后续库的预览加载
   useEffect(() => {
-    if (sortedLibraries.length === 0) return
+    if (taggedLibraries.length === 0) return
-    const currentTargets = sortedLibraries.slice(0, visibleTargetCount).map((l) => l.id)
+    const currentTargets = taggedLibraries.slice(0, visibleTargetCount).map((l) => l.id)
     void fetchPreviews(currentTargets, 10)
-  }, [sortedLibraries, visibleTargetCount, fetchPreviews])
+  }, [taggedLibraries, visibleTargetCount, fetchPreviews])
 
   // 当前已拉取并确认有内容的媒体库行
   const visibleLibraries = useMemo(() => {
-    return sortedLibraries
+    return taggedLibraries
       .slice(0, visibleTargetCount)
       .filter((lib) => (libraryData[lib.id]?.cards?.length ?? 0) > 0)
-  }, [sortedLibraries, visibleTargetCount, libraryData])
+  }, [taggedLibraries, visibleTargetCount, libraryData])
 
-  const hasMoreLibraries = visibleTargetCount < sortedLibraries.length
+  const hasMoreLibraries = visibleTargetCount < taggedLibraries.length
 
   // 底部哨兵监听与滚动双保险（触底解锁后续媒体库行）
   useEffect(() => {
@@ -258,7 +286,7 @@ export function HomePage() {
   // series-type libs (loaded via /series), so gate on cards instead.
   const carouselItems = useMemo(() => {
     const candidateMedia: Media[] = []
-    const effectiveSelectedIds = libraries
+    const effectiveSelectedIds = taggedLibraries
       .filter((l) => l.carousel_enabled === true)
       .map((l) => l.id)
 
@@ -275,7 +303,7 @@ export function HomePage() {
 
     // Fallback to all loaded items with artwork
     if (candidateMedia.length === 0) {
-      for (const lib of libraries) {
+      for (const lib of taggedLibraries) {
         const data = libraryData[lib.id]
         if (data) {
           for (const card of data.cards) {
@@ -286,14 +314,13 @@ export function HomePage() {
     }
 
     return candidateMedia.slice(0, 10)
-  }, [libraries, libraryData])
+  }, [taggedLibraries, libraryData])
 
   // 库列表还没回来先展示整页 loading；库为空时再等一下播放记录，
   // 以免在"空站点"和"有观看记录"两个终态之间闪空白。
   if (librariesLoading || (libraries.length === 0 && historyLoading)) {
     return <HomeLoadingState />
   }
-
   const empty =
     libraries.length === 0 &&
     history.length === 0
@@ -313,14 +340,32 @@ export function HomePage() {
       {historyLoading && <ContinueWatchingSkeleton />}
       {!historyLoading && history.length > 0 && <ContinueWatchingSection history={history} />}
 
-      {/* 3. 媒体库卡片区（每页展示 20 个媒体库） */}
+      {/* 3. 媒体库标签栏 + 卡片区（每页展示 20 个媒体库） */}
       {sortedLibraries.length > 0 && (
-        <HomeLibrariesSection
+        <section className="space-y-6">
-          libraries={sortedLibraries}
+          <LibraryTagBar
-          libraryData={libraryData}
+            tabs={tagTabs}
-          libraryCounts={libraryCounts}
+            selectedTagId={effectiveTagId}
-          onNeedPreviews={fetchPreviews}
+            onSelect={libraryTags.setSelectedTagId}
-        />
+            onCreate={(name) => {
+              void libraryTags.createTag(name)
+            }}
+            onManage={handleManageTags}
+            busy={libraryTags.saving}
+          />
+          {taggedLibraries.length === 0 ? (
+            <p className="rounded-2xl border border-dashed border-[var(--app-border)] bg-[var(--app-panel)] px-4 py-12 text-center text-sm text-[var(--app-muted)]">
+              「{effectiveTagId}」标签下还没有媒体库，可在「管理标签」里把媒体库归入该标签。
+            </p>
+          ) : (
+            <HomeLibrariesSection
+              libraries={taggedLibraries}
+              libraryData={libraryData}
+              libraryCounts={libraryCounts}
+              onNeedPreviews={fetchPreviews}
+            />
+          )}
+        </section>
       )}
 
       {/* 4. 各媒体库内容展示行（向下滑动渐进流式加载，不受上方20个分页限制） */}

web/src/pages/LibrariesPage.tsx

@@ -2,8 +2,11 @@ import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 
 import { libraryAPI } from '../api/library'
 import { toolsAPI } from '../api/tools'
+import { LibraryTagBar } from '../components/LibraryTagBar'
+import { openManageLibraryTagsDialog } from '../components/manageLibraryTagsDialog'
 import { openManageLibrariesDialog } from '../components/manageLibrariesDialog'
 import { useEpisodeArtworkPreference } from '../hooks/useEpisodeArtworkPreference'
+import { useLibraryTags } from '../hooks/useLibraryTags'
 import { usePinnedLibraries } from '../hooks/usePinnedLibraries'
 import { useAuthStore } from '../stores/auth'
 import {
@@ -15,6 +18,8 @@ import type { LibraryPreview } from './librariesPageModel'
 import type { Library } from '../types'
 import type { SeriesCard } from '../utils/groupSeries'
 import { fetchLibraries, invalidateLibraries, peekLibraries } from '../utils/libraryCache'
+import { ALL_TAG_ID, buildLibraryTagTabs, filterLibrariesByTag } from '../utils/libraryTags'
+import type { LibraryTag } from '../utils/libraryTags'
 import { sortLibraryPreviews } from '../utils/pinnedLibraries'
 import { partitionPreviewIDs } from '../utils/remoteEmby'
 
@@ -23,6 +28,7 @@ export function LibrariesPage() {
   const [libraries, setLibraries] = useState<Library[]>([])
   const [libraryData, setLibraryData] = useState<Record<string, { cards: SeriesCard[]; total: number }>>({})
   const { pinnedIds, loading: pinnedLoading, togglePin } = usePinnedLibraries()
+  const libraryTags = useLibraryTags()
   const [loading, setLoading] = useState(true)
   const [repairing, setRepairing] = useState(false)
   const [repairEpisodeArtwork, setRepairEpisodeArtwork] = useEpisodeArtworkPreference()
@@ -146,7 +152,31 @@ export function LibrariesPage() {
     void togglePin(libraryId)
   }, [togglePin])
 
-  const total = useMemo(() => previews.reduce((sum, preview) => sum + preview.total, 0), [previews])
+  const handleManageTags = useCallback(() => {
+    void openManageLibraryTagsDialog({
+      tags: libraryTags.tags,
+      libraries,
+      saving: libraryTags.saving,
+      onCreate: libraryTags.createTag,
+      onRename: libraryTags.renameTag,
+      onRemove: libraryTags.removeTag,
+      onAssign: libraryTags.assignLibrary,
+    })
+  }, [libraries, libraryTags])
+
+  const effectiveTagId = libraryTags.selectedTagId
+  const tagTabs = useMemo(
+    () => buildLibraryTagTabs(sortedPreviews.map((preview) => preview.library), libraryTags.tags),
+    [sortedPreviews, libraryTags.tags],
+  )
+  const taggedPreviews = useMemo(
+    () => filterPreviewsByTag(sortedPreviews, libraryTags.tags, effectiveTagId),
+    [sortedPreviews, libraryTags.tags, effectiveTagId],
+  )
+  const taggedTotal = useMemo(
+    () => taggedPreviews.reduce((sum, preview) => sum + preview.total, 0),
+    [taggedPreviews],
+  )
 
   if (loading || pinnedLoading) {
     return <p className="px-2 py-8 text-sm text-sand-500">媒体库加载中…</p>
@@ -155,8 +185,8 @@ export function LibrariesPage() {
   return (
     <div className="space-y-8">
       <LibrariesHeader
-        previewCount={previews.length}
+        previewCount={taggedPreviews.length}
-        total={total}
+        total={taggedTotal}
         isAdmin={isAdmin}
         repairMsg={repairMsg}
         repairEpisodeArtwork={repairEpisodeArtwork}
@@ -166,11 +196,26 @@ export function LibrariesPage() {
         onManageLibraries={handleManageLibraries}
       />
 
+      <LibraryTagBar
+        tabs={tagTabs}
+        selectedTagId={effectiveTagId}
+        onSelect={libraryTags.setSelectedTagId}
+        onCreate={(name) => {
+          void libraryTags.createTag(name)
+        }}
+        onManage={handleManageTags}
+        busy={libraryTags.saving}
+      />
+
       {previews.length === 0 ? (
         <LibrariesEmptyState isAdmin={isAdmin} />
+      ) : taggedPreviews.length === 0 ? (
+        <p className="rounded-3xl border border-dashed border-[var(--app-border)] bg-[var(--app-panel)] px-4 py-16 text-center text-sm text-[var(--app-muted)]">
+          「{effectiveTagId}」标签下还没有媒体库，可在「管理标签」里把媒体库归入该标签。
+        </p>
       ) : (
         <LibrariesContent
-          previews={sortedPreviews}
+          previews={taggedPreviews}
           pinnedIds={pinnedIds}
           onTogglePin={handleTogglePin}
           onNeedPreviews={fetchPreviews}
@@ -179,3 +224,20 @@ export function LibrariesPage() {
     </div>
   )
 }
+
+/** 按选中标签过滤媒体库预览（ALL_TAG_ID 时原样返回，保留置顶/手动排序）。 */
+function filterPreviewsByTag(previews: LibraryPreview[], tags: LibraryTag[], tagId: string): LibraryPreview[] {
+  if (!tagId || tagId === ALL_TAG_ID) return previews
+  const ordered = filterLibrariesByTag(
+    previews.map((preview) => ({ id: preview.library.id })),
+    tags,
+    tagId,
+  )
+  const byId = new Map(previews.map((preview) => [preview.library.id, preview]))
+  const out: LibraryPreview[] = []
+  for (const item of ordered) {
+    const preview = byId.get(item.id)
+    if (preview) out.push(preview)
+  }
+  return out
+}

web/src/types/auth.ts

@@ -1,3 +1,5 @@
+import type { LibraryTagSet } from './library'
+
 export interface User {
   id: string
   username: string
@@ -16,6 +18,8 @@ export interface User {
   is_active: boolean
   allowed_library_ids?: string[]
   pinned_library_ids?: string[]
+  /** 当前用户维护的媒体库标签分组。 */
+  library_tags?: LibraryTagSet[]
   is_default_admin?: boolean
   is_protected?: boolean
   realtime_online?: boolean

web/src/types/library.ts

@@ -28,6 +28,15 @@ export interface Library {
   total?: number
 }
 
+/**
+ * 用户自定义的媒体库标签分组。标签属于当前用户本人，用于在媒体库页把
+ * 同一标签下的媒体库聚合到一起。一个媒体库同时只属于一个标签。
+ */
+export interface LibraryTagSet {
+  name: string
+  library_ids: string[]
+}
+
 export interface ScanResult {
   library_id: string
   visited: number

web/src/utils/libraryTags.test.ts

@@ -0,0 +1,94 @@
+import {
+  ALL_TAG_ID,
+  attachLibraryToTag,
+  buildLibraryTagTabs,
+  dedupeLibraryTags,
+  detachLibraryFromTag,
+  filterLibrariesByTag,
+  normalizeLibraryTags,
+  normalizeTagName,
+  resolveSelectedTagId,
+  tagNameError,
+} from './libraryTags.ts'
+
+function check(name: string, condition: boolean) {
+  if (!condition) throw new Error(`libraryTags: ${name}`)
+}
+
+const libs = [
+  { id: 'lib-a', total: 10 },
+  { id: 'lib-b', total: 5 },
+  { id: 'lib-c', total: 0 },
+]
+
+check('empty input normalizes to empty list', normalizeLibraryTags(null).length === 0)
+check('trims and drops blank names', normalizeLibraryTags([{ name: '  ', library_ids: [] }]).length === 0)
+check(
+  'merges duplicate tag names case-insensitively',
+  normalizeLibraryTags([
+    { name: 'Anime', library_ids: ['a'] },
+    { name: 'anime', library_ids: ['b', 'a'] },
+  ]).length === 1,
+)
+check(
+  'dedupes ids inside one tag',
+  normalizeLibraryTags([{ name: '动画', library_ids: ['a', '', 'a', 'b'] }])[0].library_ids.join(',') === 'a,b',
+)
+check('truncates over-long names to 24 chars', Array.from(normalizeTagName('x'.repeat(40))).length === 24)
+
+const tabs = buildLibraryTagTabs(libs, [
+  { name: '动画', library_ids: ['lib-b', 'missing'] },
+  { name: '电影', library_ids: [] },
+])
+check('tab bar always starts with 全部', tabs[0].id === ALL_TAG_ID && tabs[0].count === 3)
+check('tag tab keeps creation order', tabs[1].name === '动画' && tabs[2].name === '电影')
+check('tag count ignores unavailable libraries', tabs[1].count === 1)
+
+check(
+  'filtering keeps tag order and drops unknown ids',
+  filterLibrariesByTag(libs, [{ name: '动画', library_ids: ['lib-c', 'missing', 'lib-a'] }], '动画')
+    .map((lib) => lib.id)
+    .join(',') === 'lib-c,lib-a',
+)
+check('全部 returns every library in original order', filterLibrariesByTag(libs, [], ALL_TAG_ID).length === 3)
+check('unknown tag yields no libraries', filterLibrariesByTag(libs, [], 'nope').length === 0)
+
+check(
+  'selected tag falls back to 全部 when the tag is gone',
+  resolveSelectedTagId([{ name: '动画', library_ids: [] }], '动画') === '动画' &&
+    resolveSelectedTagId([{ name: '动画', library_ids: [] }], '电影') === ALL_TAG_ID,
+)
+
+const claimed = dedupeLibraryTags([
+  { name: '动画', library_ids: ['a', 'b'] },
+  { name: '电影', library_ids: ['b', 'c'] },
+])
+check('one library belongs to a single tag', claimed[0].library_ids.join(',') === 'a,b')
+check('later tag loses the shared library', claimed[1].library_ids.join(',') === 'c')
+
+const attached = attachLibraryToTag(
+  [
+    { name: '动画', library_ids: ['a'] },
+    { name: '电影', library_ids: ['b'] },
+  ],
+  'a',
+  '电影',
+)
+check('attach moves the library out of its old tag', attached[0].library_ids.length === 0)
+check('attach appends to the target tag', attached[1].library_ids.join(',') === 'b,a')
+
+const detached = detachLibraryFromTag(
+  [{ name: '电影', library_ids: ['b', 'a'] }],
+  'a',
+  '电影',
+)
+check('detach removes only the requested library', detached[0].library_ids.join(',') === 'b')
+
+check('blank name is rejected', tagNameError('   ', []) !== '')
+check('duplicate name is rejected', tagNameError('动画', [{ name: '动画', library_ids: [] }]) !== '')
+check(
+  'renaming a tag to itself is allowed',
+  tagNameError('动画', [{ name: '动画', library_ids: [] }], '动画') === '',
+)
+
+console.log('libraryTags.test.ts ok')

web/src/utils/libraryTags.ts

@@ -0,0 +1,234 @@
+import type { Library, LibraryTagSet } from '../types'
+
+/** 与后端 model.MaxLibraryTagNameLen 保持一致。 */
+export const MAX_TAG_NAME_LENGTH = 24
+/** 与后端 model.MaxLibraryTags 保持一致。 */
+export const MAX_LIBRARY_TAGS = 50
+
+/** 「全部」伪标签：不参与持久化，仅用于标签栏选中项。 */
+export const ALL_TAG_ID = '__all__'
+
+export type LibraryTag = LibraryTagSet
+
+export type LibraryTagTab = {
+  /** 选中的稳定标识：ALL_TAG_ID 或标签名。 */
+  id: string
+  name: string
+  count: number
+  /** 是否为「全部」标签栏 */
+  isAll: boolean
+}
+
+const STORAGE_KEY = 'mebox_library_tags'
+const SELECTED_KEY = 'mebox_library_tag_selected'
+
+/** 标签名去空白并按字符数截断，与后端清洗规则一致。 */
+export function normalizeTagName(name: string): string {
+  return Array.from(name.trim()).slice(0, MAX_TAG_NAME_LENGTH).join('').trim()
+}
+
+export function normalizeLibraryTags(tags: unknown): LibraryTag[] {
+  if (!Array.isArray(tags)) return []
+  const out: LibraryTag[] = []
+  const indexByName = new Map<string, number>()
+  for (const raw of tags) {
+    if (!raw || typeof raw !== 'object') continue
+    const name = normalizeTagName(String((raw as LibraryTagSet).name ?? ''))
+    if (!name) continue
+    const key = name.toLowerCase()
+    let pos = indexByName.get(key)
+    if (pos === undefined) {
+      if (out.length >= MAX_LIBRARY_TAGS) break
+      out.push({ name, library_ids: [] })
+      pos = out.length - 1
+      indexByName.set(key, pos)
+    }
+    const ids = (raw as LibraryTagSet).library_ids
+    if (!Array.isArray(ids)) continue
+    const seen = new Set(out[pos].library_ids)
+    for (const id of ids) {
+      const trimmed = String(id ?? '').trim()
+      if (!trimmed || seen.has(trimmed)) continue
+      seen.add(trimmed)
+      out[pos].library_ids.push(trimmed)
+    }
+  }
+  return out
+}
+
+/** 读取本地兜底缓存：接口不可用时标签栏仍然可用。 */
+export function readCachedLibraryTags(): LibraryTag[] {
+  if (typeof window === 'undefined') return []
+  try {
+    return normalizeLibraryTags(JSON.parse(window.localStorage.getItem(STORAGE_KEY) ?? '[]'))
+  } catch {
+    return []
+  }
+}
+
+export function writeCachedLibraryTags(tags: LibraryTag[]): void {
+  if (typeof window === 'undefined') return
+  try {
+    if (tags.length === 0) {
+      window.localStorage.removeItem(STORAGE_KEY)
+      return
+    }
+    window.localStorage.setItem(STORAGE_KEY, JSON.stringify(tags))
+  } catch {
+    // 私密模式等场景忽略存储失败。
+  }
+}
+
+export function readSelectedTagId(): string {
+  if (typeof window === 'undefined') return ALL_TAG_ID
+  try {
+    return window.localStorage.getItem(SELECTED_KEY)?.trim() || ALL_TAG_ID
+  } catch {
+    return ALL_TAG_ID
+  }
+}
+
+export function writeSelectedTagId(tagId: string): void {
+  if (typeof window === 'undefined') return
+  try {
+    if (!tagId || tagId === ALL_TAG_ID) {
+      window.localStorage.removeItem(SELECTED_KEY)
+      return
+    }
+    window.localStorage.setItem(SELECTED_KEY, tagId)
+  } catch {
+    // 同上。
+  }
+}
+
+export async function loadLibraryTags(): Promise<LibraryTag[]> {
+  const { profileAPI } = await import('../api/profile')
+  const remote = normalizeLibraryTags(await profileAPI.getLibraryTags())
+  writeCachedLibraryTags(remote)
+  return remote
+}
+
+export async function saveLibraryTags(tags: LibraryTag[]): Promise<LibraryTag[]> {
+  const { profileAPI } = await import('../api/profile')
+  const saved = normalizeLibraryTags(await profileAPI.setLibraryTags(normalizeLibraryTags(tags)))
+  writeCachedLibraryTags(saved)
+  return saved
+}
+
+/**
+ * 把标签集合中的媒体库 ID 收敛为「每个库只归属一个标签」：越靠前的标签优先，
+ * 后面的标签里重复出现的库会被移除。与后端 SetLibraryTags 的语义一致。
+ */
+export function dedupeLibraryTags(tags: LibraryTag[]): LibraryTag[] {
+  const claimed = new Set<string>()
+  return tags.map((tag) => {
+    const libraryIds: string[] = []
+    for (const id of tag.library_ids) {
+      if (claimed.has(id)) continue
+      claimed.add(id)
+      libraryIds.push(id)
+    }
+    return { ...tag, library_ids: libraryIds }
+  })
+}
+
+/** 标签名是否可用：非空、未超长、且（除了自身以外）没有重名。 */
+export function tagNameError(name: string, tags: LibraryTag[], exceptName?: string): string {
+  const trimmed = normalizeTagName(name)
+  if (!trimmed) return '标签名不能为空'
+  if (Array.from(name.trim()).length > MAX_TAG_NAME_LENGTH) {
+    return `标签名最多 ${MAX_TAG_NAME_LENGTH} 个字`
+  }
+  const key = trimmed.toLowerCase()
+  const selfKey = exceptName ? normalizeTagName(exceptName).toLowerCase() : ''
+  if (key !== selfKey && tags.some((tag) => tag.name.toLowerCase() === key)) {
+    return '标签名已存在'
+  }
+  return ''
+}
+
+export function findTagIdByName(tags: LibraryTag[], name: string): string {
+  const key = normalizeTagName(name).toLowerCase()
+  if (!key) return ''
+  return tags.find((tag) => tag.name.toLowerCase() === key)?.name ?? ''
+}
+
+export function tagLibraryIds(tags: LibraryTag[], tagId: string): string[] {
+  if (!tagId || tagId === ALL_TAG_ID) return []
+  const tag = tags.find((item) => item.name === tagId)
+  return tag ? tag.library_ids : []
+}
+
+export function isLibraryInTag(tags: LibraryTag[], tagId: string, libraryId: string): boolean {
+  return tagLibraryIds(tags, tagId).includes(libraryId)
+}
+
+/**
+ * 按标签过滤媒体库：`tagId` 为「全部」时原样返回（保持原有置顶/手动排序），
+ * 否则只保留该标签下的库，并保持标签里记录的顺序。
+ */
+export function filterLibrariesByTag<T extends { id: string }>(
+  libraries: T[],
+  tags: LibraryTag[],
+  tagId: string,
+): T[] {
+  if (!tagId || tagId === ALL_TAG_ID) return libraries
+  const ids = tagLibraryIds(tags, tagId)
+  if (ids.length === 0) return []
+  const byId = new Map(libraries.map((lib) => [lib.id, lib]))
+  const out: T[] = []
+  for (const id of ids) {
+    const lib = byId.get(id)
+    if (lib) out.push(lib)
+  }
+  return out
+}
+
+/** 生成标签栏模型：首项固定为「全部」，其后按标签顺序追加。 */
+export function buildLibraryTagTabs(libraries: Library[], tags: LibraryTag[]): LibraryTagTab[] {
+  const tabs: LibraryTagTab[] = [
+    { id: ALL_TAG_ID, name: '全部', count: libraries.length, isAll: true },
+  ]
+  if (tags.length === 0) return tabs
+  const available = new Set(libraries.map((lib) => lib.id))
+  for (const tag of tags) {
+    tabs.push({
+      id: tag.name,
+      name: tag.name,
+      count: tag.library_ids.filter((id) => available.has(id)).length,
+      isAll: false,
+    })
+  }
+  return tabs
+}
+
+/** 选中的标签是否仍存在；被删除或被过滤掉时回落到「全部」。 */
+export function resolveSelectedTagId(tags: LibraryTag[], selectedId: string): string {
+  if (!selectedId || selectedId === ALL_TAG_ID) return ALL_TAG_ID
+  return tags.some((tag) => tag.name === selectedId) ? selectedId : ALL_TAG_ID
+}
+
+/** 标签下的媒体库条目总数（用于标题文案）。 */
+export function sumLibraryTotals(libraries: Library[]): number {
+  return libraries.reduce((sum, lib) => sum + (lib.total ?? 0), 0)
+}
+
+/** 把一个媒体库挂到标签下：会先从原标签移除，保证一库一标签。 */
+export function attachLibraryToTag(tags: LibraryTag[], libraryId: string, tagName: string): LibraryTag[] {
+  const target = findTagIdByName(tags, tagName)
+  if (!target) return tags
+  const next = tags.map((tag) => ({
+    ...tag,
+    library_ids: tag.library_ids.filter((id) => id !== libraryId),
+  }))
+  return next.map((tag) =>
+    tag.name === target ? { ...tag, library_ids: [...tag.library_ids, libraryId] } : tag,
+  )
+}
+
+/** 从标签下移除媒体库。 */
+export function detachLibraryFromTag(tags: LibraryTag[], libraryId: string, tagName: string): LibraryTag[] {
+  return tags.map((tag) =>
+    tag.name === tagName ? { ...tag, library_ids: tag.library_ids.filter((id) => id !== libraryId) } : tag,
+  )
+}