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/components/layout/Sidebar.tsx

@@ -86,7 +86,7 @@ export function Sidebar() {
             <NavItem href="/pilot" icon={Sparkles} label="New Session" iconColor={NAV_COLORS.dashboard} collapsed />
             <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="/escalations" icon={AlertTriangle} label="Escalations" iconColor="text-amber-400" collapsed />
+            <NavItem href="/escalations" icon={AlertTriangle} label="Escalations" iconColor="#fbbf24" collapsed />
             <NavItem href="/trees" icon={Network} label="All Flows" matchPaths={['/trees', '/flows']} iconColor={NAV_COLORS.flows} collapsed />
             <NavItem href="/assistant" icon={Brain} label="FlowPilot" iconColor={NAV_COLORS.flowPilot} collapsed />
             <NavItem href="/scripts" icon={Code2} label="Script Library" iconColor={NAV_COLORS.scripts} collapsed />
@@ -136,7 +136,7 @@ export function Sidebar() {
               Resolve
             </div>
             <NavItem href="/sessions" icon={Clock} label="Sessions" badge={stats?.active_count || undefined} iconColor={NAV_COLORS.sessions} />
-            <NavItem href="/escalations" icon={AlertTriangle} label="Escalations" iconColor="text-amber-400" />
+            <NavItem href="/escalations" icon={AlertTriangle} label="Escalations" iconColor="#fbbf24" />
             <NavItem
               href="/trees"
               icon={Network}