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>

frontend/src/components/layout/Sidebar.tsx

@@ -1,11 +1,17 @@
 import { useEffect, useState } from 'react'
-import { LayoutGrid, Network, Wrench, Clock, FileOutput, BarChart3, Settings, PanelLeftClose, PanelLeftOpen, MessageSquareText, BotMessageSquare, BookOpen, Lightbulb, Code2, Library } from 'lucide-react'
+import { useLocation } from 'react-router-dom'
+import {
+  LayoutGrid, Network, Wrench, Clock, FileOutput, BarChart3,
+  Settings, PanelLeftClose, PanelLeftOpen, MessageSquareText,
+  BookOpen, Lightbulb, Code2, Library, Brain, WandSparkles,
+} from 'lucide-react'
 import { cn } from '@/lib/utils'
 import { useUserPreferencesStore } from '@/store/userPreferencesStore'
-import { usePinnedFlowsStore } from '@/store/pinnedFlowsStore'
+import { sidebarApi } from '@/api'
-import { PinnedFlowsSection } from '@/components/sidebar/PinnedFlowsSection'
+import type { SidebarStatsResponse } from '@/api/sidebar'
+import { SidebarStatsBar } from '@/components/sidebar/SidebarStatsBar'
+import { SidebarActivityFeed } from '@/components/sidebar/SidebarActivityFeed'
 import { NavItem } from './NavItem'
-import { sessionsApi, treesApi } from '@/api'
 
 // Semantic icon colors — each nav item gets a unique color for visual landmarks
 const NAV_COLORS = {
@@ -14,7 +20,8 @@ const NAV_COLORS = {
   editor:    '#f59e0b',  // amber-500
   sessions:  '#34d399',  // emerald-400
   exports:   '#60a5fa',  // blue-400
-  ai:        '#e879f9',  // fuchsia-400
+  flowPilot: '#e879f9',  // fuchsia-400
+  flowAssist:'#f472b6',  // pink-400
   stepLib:   '#fb923c',  // orange-400
   scripts:   '#2dd4bf',  // teal-400
   kb:        '#fb7185',  // rose-400
@@ -26,40 +33,14 @@ const NAV_COLORS = {
 export function Sidebar() {
   const sidebarCollapsed = useUserPreferencesStore(s => s.sidebarCollapsed)
   const toggleSidebar = useUserPreferencesStore(s => s.toggleSidebar)
+  const location = useLocation()
 
-  const pinnedItems = usePinnedFlowsStore((s) => s.items)
+  const [stats, setStats] = useState<SidebarStatsResponse | null>(null)
-  const loadPinned = usePinnedFlowsStore((s) => s.load)
-  const unpinFlow = usePinnedFlowsStore((s) => s.unpin)
 
-  const [activeSessionCount, setActiveSessionCount] = useState(0)
+  // Fetch sidebar stats — refreshes on navigation
-  const [treeCounts, setTreeCounts] = useState({ total: 0, troubleshooting: 0, procedural: 0, maintenance: 0 })
-
-  // Load pinned flows on mount
   useEffect(() => {
-    loadPinned()
+    sidebarApi.getStats().then(setStats).catch(() => {})
-  }, [loadPinned])
+  }, [location.pathname])
-
-  // Fetch sidebar data on mount
-  useEffect(() => {
-    const fetchData = async () => {
-      try {
-        const [activeSessions, allTrees] = await Promise.all([
-          sessionsApi.list({ completed: false, size: 50 }).catch(() => []),
-          treesApi.list({ sort_by: 'name' }).catch(() => []),
-        ])
-        setActiveSessionCount(activeSessions.length)
-
-        const total = allTrees.length
-        const troubleshooting = allTrees.filter(t => t.tree_type === 'troubleshooting').length
-        const procedural = allTrees.filter(t => t.tree_type === 'procedural').length
-        const maintenance = allTrees.filter(t => t.tree_type === 'maintenance').length
-        setTreeCounts({ total, troubleshooting, procedural, maintenance })
-      } catch {
-        // Silently handle errors
-      }
-    }
-    fetchData()
-  }, [])
 
   const handleSidebarWheel = (e: React.WheelEvent<HTMLElement>) => {
     const sidebar = e.currentTarget
@@ -93,14 +74,15 @@ export function Sidebar() {
           {/* Collapsed: icon-only nav */}
           <div className="flex flex-col items-center px-1.5 py-3 space-y-1">
             <NavItem href="/" icon={LayoutGrid} label="Dashboard" iconColor={NAV_COLORS.dashboard} collapsed />
+            <NavItem href="/sessions" icon={Clock} label="Sessions" badge={stats?.active_count || undefined} iconColor={NAV_COLORS.sessions} collapsed />
             <NavItem href="/trees" icon={Network} label="All Flows" matchPaths={['/trees', '/flows']} iconColor={NAV_COLORS.flows} collapsed />
-            <NavItem href="/my-trees" icon={Wrench} label="Flow Editor" iconColor={NAV_COLORS.editor} collapsed />
+            <NavItem href="/assistant" icon={Brain} label="FlowPilot" iconColor={NAV_COLORS.flowPilot} collapsed />
-            <NavItem href="/sessions" icon={Clock} label="Sessions" badge={activeSessionCount || undefined} iconColor={NAV_COLORS.sessions} collapsed />
-            <NavItem href="/shares" icon={FileOutput} label="Exports" iconColor={NAV_COLORS.exports} collapsed />
-            <NavItem href="/assistant" icon={BotMessageSquare} label="AI Assistant" iconColor={NAV_COLORS.ai} collapsed />
-            <NavItem href="/step-library" icon={Library} label="Step Library" iconColor={NAV_COLORS.stepLib} collapsed />
             <NavItem href="/scripts" icon={Code2} label="Script Library" iconColor={NAV_COLORS.scripts} collapsed />
+            <NavItem href="/my-trees" icon={Wrench} label="Flow Editor" iconColor={NAV_COLORS.editor} collapsed />
+            <NavItem href="/flow-assist" icon={WandSparkles} label="Flow Assist" iconColor={NAV_COLORS.flowAssist} collapsed />
+            <NavItem href="/step-library" icon={Library} label="Step Library" iconColor={NAV_COLORS.stepLib} collapsed />
             <NavItem href="/kb-accelerator" icon={Lightbulb} label="KB Accelerator" iconColor={NAV_COLORS.kb} collapsed />
+            <NavItem href="/shares" icon={FileOutput} label="Exports" iconColor={NAV_COLORS.exports} collapsed />
             <NavItem href="/analytics" icon={BarChart3} label="Analytics" iconColor={NAV_COLORS.analytics} collapsed />
             <NavItem href="/guides" icon={BookOpen} label="User Guides" iconColor={NAV_COLORS.guides} collapsed />
             <NavItem href="/feedback" icon={MessageSquareText} label="Feedback" iconColor={NAV_COLORS.feedback} collapsed />
@@ -108,34 +90,62 @@ export function Sidebar() {
         </>
       ) : (
         <>
-          {/* Pinned Flows */}
+          {/* Stats Bar */}
-          <PinnedFlowsSection flows={pinnedItems} onUnpin={unpinFlow} />
+          <SidebarStatsBar
+            resolved={stats?.resolved_today ?? 0}
+            active={stats?.active_count ?? 0}
+            sessionMinutes={stats?.total_session_minutes_today ?? 0}
+          />
+
+          {/* Activity Feed */}
+          <SidebarActivityFeed
+            activeSessions={stats?.active_sessions ?? []}
+            recentCompletions={stats?.recent_completions ?? []}
+            totalActive={stats?.active_count ?? 0}
+          />
 
           <div style={{ borderBottom: '1px solid var(--glass-border)' }} />
 
-          {/* Primary Navigation */}
+          {/* Navigation */}
           <div className="px-3 py-2 space-y-0.5">
+            {/* Dashboard (standalone) */}
             <NavItem href="/" icon={LayoutGrid} label="Dashboard" iconColor={NAV_COLORS.dashboard} />
+
+            {/* Resolve */}
+            <div className="font-label text-[0.5625rem] uppercase tracking-[0.12em] text-[#5a6170] px-3 pt-3 pb-1">
+              Resolve
+            </div>
+            <NavItem href="/sessions" icon={Clock} label="Sessions" badge={stats?.active_count || undefined} iconColor={NAV_COLORS.sessions} />
             <NavItem
               href="/trees"
               icon={Network}
               label="All Flows"
-              badge={treeCounts.total || undefined}
+              badge={stats?.tree_counts.total || undefined}
               iconColor={NAV_COLORS.flows}
               matchPaths={['/trees', '/flows']}
               children={[
-                { href: '/trees?type=troubleshooting', label: 'Troubleshooting', count: treeCounts.troubleshooting || undefined },
+                { href: '/trees?type=troubleshooting', label: 'Troubleshooting', count: stats?.tree_counts.troubleshooting || undefined },
-                { href: '/trees?type=procedural', label: 'Projects', count: treeCounts.procedural || undefined },
+                { href: '/trees?type=procedural', label: 'Projects', count: stats?.tree_counts.procedural || undefined },
-                { href: '/trees?type=maintenance', label: 'Maintenance', count: treeCounts.maintenance || undefined },
+                { href: '/trees?type=maintenance', label: 'Maintenance', count: stats?.tree_counts.maintenance || undefined },
               ]}
             />
-            <NavItem href="/my-trees" icon={Wrench} label="Flow Editor" iconColor={NAV_COLORS.editor} />
+            <NavItem href="/assistant" icon={Brain} label="FlowPilot" iconColor={NAV_COLORS.flowPilot} />
-            <NavItem href="/sessions" icon={Clock} label="Sessions" badge={activeSessionCount || undefined} iconColor={NAV_COLORS.sessions} />
-            <NavItem href="/shares" icon={FileOutput} label="Exports" iconColor={NAV_COLORS.exports} />
-            <NavItem href="/assistant" icon={BotMessageSquare} label="AI Assistant" iconColor={NAV_COLORS.ai} />
-            <NavItem href="/step-library" icon={Library} label="Step Library" iconColor={NAV_COLORS.stepLib} />
             <NavItem href="/scripts" icon={Code2} label="Script Library" iconColor={NAV_COLORS.scripts} />
+
+            {/* Build */}
+            <div className="font-label text-[0.5625rem] uppercase tracking-[0.12em] text-[#5a6170] px-3 pt-3 pb-1">
+              Build
+            </div>
+            <NavItem href="/my-trees" icon={Wrench} label="Flow Editor" iconColor={NAV_COLORS.editor} />
+            <NavItem href="/flow-assist" icon={WandSparkles} label="Flow Assist" iconColor={NAV_COLORS.flowAssist} />
+            <NavItem href="/step-library" icon={Library} label="Step Library" iconColor={NAV_COLORS.stepLib} />
             <NavItem href="/kb-accelerator" icon={Lightbulb} label="KB Accelerator" iconColor={NAV_COLORS.kb} />
+
+            {/* Insights */}
+            <div className="font-label text-[0.5625rem] uppercase tracking-[0.12em] text-[#5a6170] px-3 pt-3 pb-1">
+              Insights
+            </div>
+            <NavItem href="/shares" icon={FileOutput} label="Exports" iconColor={NAV_COLORS.exports} />
             <NavItem href="/analytics" icon={BarChart3} label="Analytics" iconColor={NAV_COLORS.analytics} />
           </div>
         </>