docs: update CLAUDE.md with session quick wins (#51-#55)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -159,6 +159,13 @@ When adding new frontend pages or components, use "ResolutionFlow" for any user-
   - Utility script: `backend/make_superadmin_simple.py list|<email>` - promote users to super admin
   - ActionMenu component: uses React Portal to avoid overflow clipping in tables
   - **API Path Gotcha:** Frontend `apiClient` baseURL is `http://localhost:8000/api/v1` — all API calls should use relative paths WITHOUT `/api/v1/` prefix (e.g., `/admin/users` not `/api/v1/admin/users`)
+- **Session Quick Wins (Issues #51-#55, PR #72):**
+  - Session timer: `useSessionTimer` hook displays elapsed `MM:SS` / `HH:MM:SS` in session header
+  - Keyboard hints: `Tab` shortcut focuses notes textarea (`id="session-notes"`), hint text updated
+  - Repeat Last Session: saves `{tree_id, tree_name, client_name, ticket_number}` to localStorage on session start; "Repeat" button on tree library page prefills metadata via `location.state`
+  - Session auto-recovery: fetches incomplete sessions on tree library mount; resume/dismiss banner (dismissed IDs in `sessionStorage`)
+  - Copy step to clipboard: copy button on each decision card in `SessionDetailPage` timeline
+  - Delete tree button: added to `TreeTableView` and `TreeListView` (was missing, only grid view had it)
 
 ### What's In Progress
 
@@ -263,7 +270,7 @@ patherly/
 │   │   │   ├── auth.ts
 │   │   │   ├── trees.ts
 │   │   │   └── sessions.ts
-│   │   ├── hooks/                  # Custom React hooks (useKeyboardShortcuts, usePermissions)
+│   │   ├── hooks/                  # Custom React hooks (useKeyboardShortcuts, usePermissions, useSessionTimer)
 │   │   ├── store/
 │   │   │   ├── authStore.ts        # Zustand auth state
 │   │   │   ├── themeStore.ts       # Unused (dark-only mode, no toggle)