Complete Phase 2: Frontend implementation with React + TypeScript

Frontend Features:
- React 18 + Vite + TypeScript + Tailwind CSS + Zustand
- JWT authentication with automatic token refresh
- Tree library with search and category filtering
- Full tree navigation (decision/action/solution nodes)
- Session management with notes and completion
- Session history with export (Markdown/Text/HTML)
- ErrorBoundary for graceful error handling

Backend Fixes:
- CORS: Added port 5174 to allowed origins
- Sessions: Fixed JSONB datetime serialization (mode='json')

Documentation:
- Updated PROGRESS.md with Phase 2 completion
- Updated 03-DEVELOPMENT-ROADMAP.md with checked items
- Added PHASE-2.5-PERSONAL-BRANCHING.md spec

Seed Data:
- Added backend/scripts/seed_data.py with Password Reset tree

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

frontend/src/types/auth.ts

@@ -0,0 +1,12 @@
+export interface Token {
+  access_token: string
+  refresh_token: string
+  token_type: string
+}
+
+export interface AuthState {
+  user: import('./user').User | null
+  token: Token | null
+  isAuthenticated: boolean
+  isLoading: boolean
+}

frontend/src/types/index.ts

@@ -0,0 +1,17 @@
+export * from './user'
+export * from './auth'
+export * from './tree'
+export * from './session'
+
+// API response wrapper types
+export interface PaginatedResponse<T> {
+  items: T[]
+  total: number
+  page: number
+  size: number
+  pages: number
+}
+
+export interface ApiError {
+  detail: string
+}

frontend/src/types/session.ts

@@ -0,0 +1,55 @@
+import type { TreeStructure } from './tree'
+
+export interface DecisionRecord {
+  node_id: string
+  question: string | null
+  answer: string | null
+  action_performed: string | null
+  notes: string | null
+  automation_used: boolean
+  timestamp: string
+  attachments: string[]
+}
+
+export interface Session {
+  id: string
+  tree_id: string
+  user_id: string
+  tree_snapshot: TreeStructure
+  path_taken: string[]
+  decisions: DecisionRecord[]
+  started_at: string
+  completed_at: string | null
+  ticket_number: string | null
+  client_name: string | null
+  exported: boolean
+}
+
+export interface SessionCreate {
+  tree_id: string
+  ticket_number?: string
+  client_name?: string
+}
+
+export interface SessionUpdate {
+  path_taken?: string[]
+  decisions?: DecisionRecord[]
+  ticket_number?: string
+  client_name?: string
+}
+
+export interface SessionExport {
+  format: 'text' | 'markdown' | 'html'
+  include_timestamps?: boolean
+  include_tree_info?: boolean
+}
+
+// Navigation state for active session
+export interface SessionNavigationState {
+  activeSession: Session | null
+  currentNodeId: string
+  pathTaken: string[]
+  decisions: DecisionRecord[]
+  isLoading: boolean
+  error: string | null
+}

frontend/src/types/tree.ts

@@ -0,0 +1,98 @@
+// Tree node types
+export type NodeType = 'decision' | 'action' | 'solution'
+
+export interface TreeOption {
+  id: string
+  label: string
+  next_node_id: string
+}
+
+export interface TreeNodeBase {
+  id: string
+  type: NodeType
+}
+
+export interface DecisionNode extends TreeNodeBase {
+  type: 'decision'
+  question: string
+  help_text?: string
+  options: TreeOption[]
+  children: TreeNode[]
+}
+
+export interface ActionNode extends TreeNodeBase {
+  type: 'action'
+  title: string
+  description: string
+  commands?: string[]
+  expected_outcome?: string
+  next_node_id?: string
+  children?: TreeNode[]
+}
+
+export interface SolutionNode extends TreeNodeBase {
+  type: 'solution'
+  title: string
+  description: string
+  resolution_steps?: string[]
+}
+
+export type TreeNode = DecisionNode | ActionNode | SolutionNode
+
+export interface TreeStructure {
+  id: string
+  type: NodeType
+  question?: string
+  title?: string
+  description?: string
+  help_text?: string
+  options?: TreeOption[]
+  commands?: string[]
+  expected_outcome?: string
+  next_node_id?: string
+  resolution_steps?: string[]
+  children?: TreeStructure[]
+}
+
+// API response types
+export interface Tree {
+  id: string
+  name: string
+  description: string | null
+  category: string | null
+  tree_structure: TreeStructure
+  author_id: string | null
+  team_id: string | null
+  is_active: boolean
+  version: number
+  created_at: string
+  updated_at: string
+  usage_count: number
+}
+
+export interface TreeListItem {
+  id: string
+  name: string
+  description: string | null
+  category: string | null
+  is_active: boolean
+  version: number
+  usage_count: number
+  created_at: string
+  updated_at: string
+}
+
+export interface TreeCreate {
+  name: string
+  description?: string
+  category?: string
+  tree_structure: TreeStructure
+}
+
+export interface TreeUpdate {
+  name?: string
+  description?: string
+  category?: string
+  tree_structure?: TreeStructure
+  is_active?: boolean
+}

frontend/src/types/user.ts

@@ -0,0 +1,28 @@
+export type UserRole = 'admin' | 'engineer' | 'viewer'
+
+export interface User {
+  id: string
+  email: string
+  name: string
+  role: UserRole
+  team_id: string | null
+  created_at: string
+  last_login: string | null
+}
+
+export interface UserCreate {
+  email: string
+  password: string
+  name: string
+  role?: UserRole
+}
+
+export interface UserLogin {
+  email: string
+  password: string
+}
+
+export interface UserUpdate {
+  name?: string
+  email?: string
+}