refactor: merge QuickLaunch into CommandPalette, amber New Session button

- Remove QuickLaunch (lightning bolt) from TopBar — redundant with CommandPalette
- Delete QuickLaunch.tsx (dead code, no remaining imports)
- Add "New Project" to CommandPalette quick actions
- Change sidebar "New Session" button from cyan to amber-400

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

frontend/src/components/layout/TopBar.tsx

@@ -1,11 +1,10 @@
 import { useState, useRef, useEffect, useCallback } from 'react'
 import { Link, useNavigate } from 'react-router-dom'
-import { Search, Zap, LogOut, Shield, Settings, HelpCircle } from 'lucide-react'
+import { Search, LogOut, Shield, Settings, HelpCircle } from 'lucide-react'
 import { useAuthStore } from '@/store/authStore'
 import { usePermissions } from '@/hooks/usePermissions'
 import { BrandLogo } from '@/components/common/BrandLogo'
 import { CommandPalette } from './CommandPalette'
-import { QuickLaunch } from './QuickLaunch'
 import { NotificationsPanel } from './NotificationsPanel'
 import { cn } from '@/lib/utils'
 
@@ -16,7 +15,7 @@ export function TopBar() {
 
   const [userMenuOpen, setUserMenuOpen] = useState(false)
   const [commandPaletteOpen, setCommandPaletteOpen] = useState(false)
-  const [quickLaunchOpen, setQuickLaunchOpen] = useState(false)
+
   const menuRef = useRef<HTMLDivElement>(null)
 
   const handleLogout = async () => {
@@ -113,13 +112,6 @@ export function TopBar() {
 
         {/* Action buttons */}
         <div className="flex items-center gap-1">
-          <button
-            onClick={() => setQuickLaunchOpen(true)}
-            className="rounded-lg p-2 text-muted-foreground hover:bg-card hover:text-foreground transition-colors"
-            title="Quick Launch"
-          >
-            <Zap size={18} />
-          </button>
           <Link
             to="/guides"
             className="rounded-lg p-2 text-muted-foreground hover:bg-card hover:text-foreground transition-colors"
@@ -192,7 +184,6 @@ export function TopBar() {
 
       {/* Command Palette */}
       <CommandPalette open={commandPaletteOpen} onClose={() => setCommandPaletteOpen(false)} />
-      <QuickLaunch open={quickLaunchOpen} onClose={() => setQuickLaunchOpen(false)} />
     </>
   )
 }