feat(dashboard): FlowPilot cockpit dashboard + sidebar redesign

- Replace QuickStartPage with FlowPilot-centric dashboard
- Add StartSessionInput with Guided/Chat mode toggle
- Add PendingEscalations, ActiveFlowPilotSessions, PerformanceCards
- Add KnowledgeBaseCards, TeamSummary, RecentFlowPilotSessions
- Every number/card is a portal to its detail page
- Restructure sidebar: Resolve/Knowledge/Insights sections
- Remove redundant nav items (FlowPilot, Flow Editor, Flow Assist, etc.)
- Wire prefill from dashboard input to FlowPilot intake
- Update mobile nav to match new sidebar structure

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

frontend/src/components/flowpilot/FlowPilotIntake.tsx

@@ -10,10 +10,11 @@ import type { FileUploadResponse } from '@/types/upload'
 interface FlowPilotIntakeProps {
   onSubmit: (request: AISessionCreateRequest) => void
   isLoading: boolean
+  defaultProblem?: string
 }
 
-export function FlowPilotIntake({ onSubmit, isLoading }: FlowPilotIntakeProps) {
-  const [text, setText] = useState('')
+export function FlowPilotIntake({ onSubmit, isLoading, defaultProblem }: FlowPilotIntakeProps) {
+  const [text, setText] = useState(defaultProblem || '')
   const [showLogs, setShowLogs] = useState(false)
   const [logContent, setLogContent] = useState('')
   const [showTicketPicker, setShowTicketPicker] = useState(false)