fix: command palette hover contrast + FlowPilot routing

- Hover state uses bg-card-hover + text-foreground for readable contrast
- FlowPilot item navigates to /pilot (copilot) instead of /assistant
- Rename "Ask FlowPilot AI" → "Troubleshoot with FlowPilot"
- Update placeholder to hint at troubleshooting capability

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

frontend/src/components/layout/CommandPalette.tsx

@@ -174,9 +174,9 @@ export function CommandPalette({ open, onClose }: CommandPaletteProps) {
     const flowPilotItem: PaletteItem = {
       id: 'flowpilot-ai',
       group: 'flowpilot',
-      title: 'Ask FlowPilot AI',
+      title: 'Troubleshoot with FlowPilot',
       subtitle: trimmed,
-      path: '/assistant',
+      path: '/pilot',
       icon: 'sparkles',
     }
 
@@ -326,7 +326,7 @@ export function CommandPalette({ open, onClose }: CommandPaletteProps) {
             value={query}
             onChange={e => { setQuery(e.target.value); setSelectedIndex(0) }}
             onKeyDown={handleKeyDown}
-            placeholder="Search flows, ask a question, navigate…"
+            placeholder="Search flows, sessions, tags... or describe an issue to troubleshoot"
             className="flex-1 bg-transparent text-sm text-foreground placeholder:text-muted-foreground outline-hidden"
           />
           <kbd className="rounded border border-border bg-background px-1.5 py-0.5 font-mono text-[0.625rem] text-muted-foreground">
@@ -376,7 +376,7 @@ export function CommandPalette({ open, onClose }: CommandPaletteProps) {
                               'bg-primary/5 border border-primary/10',
                               isQuestion ? 'mb-1' : '',
                               isSelected
-                                ? 'bg-primary/10 border-primary/20'
+                                ? 'bg-primary/15 border-primary/30'
                                 : 'hover:bg-primary/10 hover:border-primary/20'
                             )}
                           >
@@ -414,8 +414,8 @@ export function CommandPalette({ open, onClose }: CommandPaletteProps) {
                           className={cn(
                             'flex w-full items-center gap-3 rounded-lg px-3 py-2.5 text-left transition-colors',
                             isSelected
-                              ? 'bg-accent text-foreground'
-                              : 'text-muted-foreground hover:bg-accent/50'
+                              ? 'bg-card-hover text-foreground'
+                              : 'text-muted-foreground hover:bg-card-hover hover:text-foreground'
                           )}
                         >
                           <ItemIcon