fix(flowpilot): fix 4 Phase 2 escalation bugs + update Tailwind version in CLAUDE.md

- Fix escalation status mismatch: hook set 'escalated' but backend returns
  'requesting_escalation'
- Fix list_sessions to include sessions picked up by Engineer B via
  escalation_package->>'picked_up_by' JSONB query
- Fix sidebar escalation icon color: was Tailwind class 'text-amber-400'
  passed to style={{color}}, now hex '#fbbf24'
- Replace window.location.reload() after ticket linking with
  onReloadSession callback to preserve session state
- Update CLAUDE.md: Tailwind CSS v3 → v4 (@tailwindcss/vite, CSS-only config)

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

frontend/src/hooks/useFlowPilotSession.ts

@@ -151,7 +151,7 @@ export function useFlowPilotSession(): UseFlowPilotSession {
     setIsProcessing(true)
     try {
       const result = await aiSessionsApi.escalateSession(session.id, data)
-      setSession(prev => prev ? { ...prev, status: 'escalated' } : null)
+      setSession(prev => prev ? { ...prev, status: 'requesting_escalation' } : null)
       setDocumentation(result.documentation)
       setPsaPushStatus(result.psa_push_status)
       setPsaPushError(result.psa_push_error)