Add tree organization system with categories, tags, and folders

Features:
- Categories: Global and team-specific tree categorization (admin-managed)
- Tags: Flexible tree tagging with autocomplete (author + admin)
- User folders: Personal tree collections with subfolder support
  - Hierarchical structure (max 3 levels deep)
  - Right-click context menu for folder management
  - Cascade delete for subfolders
- Filter trees by category, tags, and folder in library view

Backend:
- New models: Category, Tag, UserFolder with relationships
- New API endpoints for categories, tags, and folders
- Tree organization migrations (005, 006)

Frontend:
- FolderSidebar with hierarchical folder tree
- FolderEditModal for create/edit with color picker
- AddToFolderMenu for quick tree organization
- TagInput with autocomplete and TagBadges display
- Updated TreeMetadataForm and TreeLibraryPage

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/types/category.ts

@@ -0,0 +1,45 @@
+// Category types for tree organization
+
+export interface Category {
+  id: string
+  name: string
+  slug: string
+  description: string | null
+  team_id: string | null
+  display_order: number
+  is_active: boolean
+  created_at: string
+  updated_at: string
+  tree_count: number
+}
+
+export interface CategoryListItem {
+  id: string
+  name: string
+  slug: string
+  description: string | null
+  team_id: string | null
+  display_order: number
+  is_active: boolean
+  tree_count: number
+}
+
+export interface CategoryCreate {
+  name: string
+  description?: string | null
+  team_id?: string | null
+}
+
+export interface CategoryUpdate {
+  name?: string
+  description?: string | null
+  display_order?: number
+  is_active?: boolean
+}
+
+// Embedded category info for tree responses
+export interface CategoryInfo {
+  id: string
+  name: string
+  slug: string
+}

frontend/src/types/folder.ts

@@ -0,0 +1,52 @@
+// Folder types for user tree organization
+
+export interface Folder {
+  id: string
+  name: string
+  color: string
+  icon: string
+  parent_id: string | null
+  display_order: number
+  tree_count: number
+  created_at: string
+  updated_at: string
+}
+
+export interface FolderListItem {
+  id: string
+  name: string
+  color: string
+  icon: string
+  parent_id: string | null
+  display_order: number
+  tree_count: number
+}
+
+export interface FolderCreate {
+  name: string
+  color?: string
+  icon?: string
+  parent_id?: string | null
+}
+
+export interface FolderUpdate {
+  name?: string
+  color?: string
+  icon?: string
+  display_order?: number
+  parent_id?: string | null
+}
+
+export interface FolderReorderRequest {
+  folder_ids: string[]
+}
+
+export interface FolderTreeRequest {
+  tree_id: string
+}
+
+// For hierarchical display of folders
+export interface FolderTreeItem extends FolderListItem {
+  children: FolderTreeItem[]
+  isExpanded?: boolean
+}

frontend/src/types/index.ts

@@ -3,6 +3,9 @@ export * from './auth'
 export * from './tree'
 export * from './session'
 export * from './invite'
+export * from './tag'
+export * from './category'
+export * from './folder'
 
 // API response wrapper types
 export interface PaginatedResponse<T> {

frontend/src/types/tag.ts

@@ -0,0 +1,27 @@
+// Tag types for tree organization
+
+export interface Tag {
+  id: string
+  name: string
+  slug: string
+  team_id: string | null
+  usage_count: number
+  created_at: string
+}
+
+export interface TagListItem {
+  id: string
+  name: string
+  slug: string
+  team_id: string | null
+  usage_count: number
+}
+
+export interface TagCreate {
+  name: string
+  team_id?: string | null
+}
+
+export interface TagAssignment {
+  tags: string[]
+}

frontend/src/types/tree.ts

@@ -1,3 +1,5 @@
+import type { CategoryInfo } from './category'
+
 // Tree node types
 export type NodeType = 'decision' | 'action' | 'solution'
 
@@ -60,10 +62,15 @@ export interface Tree {
   name: string
   description: string | null
   category: string | null
+  category_id: string | null
+  category_info: CategoryInfo | null
+  tags: string[]
   tree_structure: TreeStructure
   author_id: string | null
   team_id: string | null
   is_active: boolean
+  is_public: boolean
+  is_default: boolean
   version: number
   created_at: string
   updated_at: string
@@ -75,7 +82,13 @@ export interface TreeListItem {
   name: string
   description: string | null
   category: string | null
+  category_id: string | null
+  category_info: CategoryInfo | null
+  tags: string[]
+  author_id: string | null
   is_active: boolean
+  is_public: boolean
+  is_default: boolean
   version: number
   usage_count: number
   created_at: string
@@ -86,13 +99,33 @@ export interface TreeCreate {
   name: string
   description?: string
   category?: string
+  category_id?: string | null
+  tags?: string[]
   tree_structure: TreeStructure
+  is_public?: boolean
+  is_default?: boolean
 }
 
 export interface TreeUpdate {
   name?: string
   description?: string
   category?: string
+  category_id?: string | null
+  tags?: string[]
   tree_structure?: TreeStructure
   is_active?: boolean
+  is_public?: boolean
+}
+
+// Filter params for tree listing
+export interface TreeFilters {
+  category?: string
+  category_id?: string
+  tags?: string
+  folder_id?: string
+  is_active?: boolean
+  author_id?: string
+  is_public?: boolean
+  skip?: number
+  limit?: number
 }

frontend/src/types/user.ts

@@ -5,6 +5,7 @@ export interface User {
   email: string
   name: string
   role: UserRole
+  is_team_admin: boolean
   team_id: string | null
   created_at: string
   last_login: string | null