feat: sidebar redesign — activity feed, grouped nav, AI split (#107)

* docs: add 5 sidebar icon color concepts for UX review

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat(ui): add semantic icon colors and updated icons to sidebar nav

Swap generic icons for more descriptive alternatives (Network, Wrench,
FileOutput, Library, Code2, Lightbulb) and assign each nav item a unique
semantic color for instant visual landmarks.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(ui): default Sessions page to Active tab, reorder tabs

Active sessions are what engineers care about most. Tab order is now
Active, Prepared, Completed, All.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: add sidebar grouping and AI naming concept mockups

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: add sidebar redesign context and decision summary

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: add sidebar redesign spec and implementation plan

Design spec covers: activity zone with daily stats + session feed,
nav grouping (Resolve/Build/Insights), AI split (FlowPilot + Flow Assist),
pinned flows removal. Implementation plan has 5 chunks, 12 tasks, 39 steps.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: add sidebar stats Pydantic schemas

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* test: add failing tests for sidebar stats endpoint

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: add sidebar stats endpoint with daily stats and activity feed

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: add sidebar API client, stats bar, activity feed components

New components: SidebarStatsBar, SidebarActivityFeed, ActivityItem.
New API client for sidebar stats endpoint. Pulse-dot CSS animation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: restructure sidebar with stats bar, activity feed, and grouped nav

Dashboard-first layout with Resolve/Build/Insights groups.
AI split: FlowPilot (Resolve) + Flow Assist (Build).
Stats bar: Resolved/Active/In Session daily counters.
Activity feed: active sessions with CW ticket #, recent completions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* refactor: remove pinned flows frontend (PinnedFlowsSection, store, API, pin buttons)

Removed: PinnedFlowsSection component, pinnedFlowsStore, pinnedFlows API client.
Cleaned: pin buttons from TreeGridView, TreeListView, TreeTableView.
Cleaned: favorites section from QuickStartPage, pin props from TreeLibraryPage.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: add FlowAssistPage placeholder and /flow-assist route

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: real-time sidebar stats via session-changed events

Sidebar now refreshes stats when sessions are created or completed,
not just on page navigation. Uses window event bus pattern (same as
folder-changed events in codebase).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: live-ticking In Session timer using active session start times

SidebarStatsBar now computes active session elapsed time client-side
from started_at timestamps, ticking every 60s. Backend only returns
completed session minutes to avoid double-counting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: sidebar In Session timer ticks every second and shows seconds

Timer now uses 1s interval (not 60s) and displays seconds when under
a minute so it matches the session timer in the flow UI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: trigger PR environment redeploy

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* debug: add console.log to SidebarStatsBar for timer investigation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: parse sidebar timestamps as UTC (append Z suffix)

Backend returns naive UTC timestamps without timezone indicator.
JS Date() treats bare ISO strings as local time, causing the timer
to compute negative elapsed time (future timestamps). Appending 'Z'
forces UTC parsing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: rename 'In Session' to 'Total Time' for clarity

Makes it clear the timer is an aggregate of all sessions today,
not just the current one.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/api/index.ts

@@ -11,7 +11,6 @@ export { default as stepCategoriesApi } from './stepCategories'
 export { default as accountsApi } from './accounts'
 export { default as adminApi } from './admin'
 export { treeMarkdownApi } from './treeMarkdown'
-export { default as pinnedFlowsApi } from './pinnedFlows'
 export { default as analyticsApi } from './analytics'
 export { targetListsApi } from './targetLists'
 export { maintenanceSchedulesApi, batchLaunchApi } from './maintenanceSchedules'
@@ -23,3 +22,4 @@ export { flowTransferApi } from './flowTransfer'
 export { kbAcceleratorApi } from './kbAccelerator'
 export { scriptsApi } from './scripts'
 export { integrationsApi, sessionPsaApi } from './integrations'
+export { sidebarApi } from './sidebar'

frontend/src/api/pinnedFlows.ts

@@ -1,34 +0,0 @@
-import { apiClient } from './client'
-
-export interface PinnedFlow {
-  id: string
-  tree_id: string
-  tree_name: string
-  tree_type: 'troubleshooting' | 'procedural' | 'maintenance'
-  category_emoji?: string
-  category_name?: string
-  pinned_at: string
-  display_order: number
-}
-
-export interface PinnedFlowsResponse {
-  items: PinnedFlow[]
-  count: number
-}
-
-export const pinnedFlowsApi = {
-  list: async (): Promise<PinnedFlowsResponse> => {
-    const { data } = await apiClient.get('/trees/pinned')
-    return data
-  },
-
-  unpin: async (treeId: string): Promise<void> => {
-    await apiClient.delete(`/trees/${treeId}/pin`)
-  },
-
-  pin: async (treeId: string): Promise<void> => {
-    await apiClient.post(`/trees/${treeId}/pin`)
-  },
-}
-
-export default pinnedFlowsApi

frontend/src/api/sessions.ts

@@ -31,6 +31,7 @@ export const sessionsApi = {
 
   async create(data: SessionCreate): Promise<Session> {
     const response = await apiClient.post<Session>('/sessions', data)
+    window.dispatchEvent(new Event('session-changed'))
     return response.data
   },
 
@@ -41,6 +42,7 @@ export const sessionsApi = {
 
   async complete(id: string, data: SessionComplete): Promise<Session> {
     const response = await apiClient.post<Session>(`/sessions/${id}/complete`, data)
+    window.dispatchEvent(new Event('session-changed'))
     return response.data
   },
 

frontend/src/api/sidebar.ts

@@ -0,0 +1,45 @@
+import apiClient from './client'
+
+export interface SidebarActiveSession {
+  session_id: string
+  tree_name: string
+  tree_id: string
+  tree_type: 'troubleshooting' | 'procedural' | 'maintenance'
+  started_at: string
+  ticket_number: string | null
+  psa_ticket_id: string | null
+}
+
+export interface SidebarRecentSession {
+  session_id: string
+  tree_name: string
+  tree_id: string
+  tree_type: 'troubleshooting' | 'procedural' | 'maintenance'
+  completed_at: string
+}
+
+export interface SidebarTreeCounts {
+  total: number
+  troubleshooting: number
+  procedural: number
+  maintenance: number
+}
+
+export interface SidebarStatsResponse {
+  resolved_today: number
+  active_count: number
+  total_session_minutes_today: number
+  tree_counts: SidebarTreeCounts
+  active_sessions: SidebarActiveSession[]
+  recent_completions: SidebarRecentSession[]
+}
+
+export const sidebarApi = {
+  getStats: async (): Promise<SidebarStatsResponse> => {
+    const tzOffset = new Date().getTimezoneOffset()
+    const response = await apiClient.get<SidebarStatsResponse>(
+      `/sessions/sidebar-stats?tz_offset=${tzOffset}`
+    )
+    return response.data
+  },
+}