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>

backend/app/api/endpoints/ai_sessions.py

@@ -15,7 +15,7 @@ from typing import Annotated, Optional
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Request, status
-from sqlalchemy import select, func
+from sqlalchemy import or_, select, func
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
 
@@ -465,10 +465,16 @@ async def list_sessions(
     skip: int = Query(0, ge=0),
     limit: int = Query(20, ge=1, le=100),
 ):
-    """List the current user's AI sessions."""
+    """List the current user's AI sessions (owned or picked up)."""
+    user_id_str = str(current_user.id)
     query = (
         select(AISession)
-        .where(AISession.user_id == current_user.id)
+        .where(
+            or_(
+                AISession.user_id == current_user.id,
+                AISession.escalation_package["picked_up_by"].as_string() == user_id_str,
+            )
+        )
         .order_by(AISession.created_at.desc())
         .offset(skip)
         .limit(limit)