fix: dashboard and omnibar route to /assistant chat, not /pilot guided flow

Aligns with copilot-first GTM direction — the dashboard chat input and
CommandPalette "Troubleshoot with FlowPilot" now launch the conversational
AI chat (/assistant), not the structured diagnostic flow (/pilot). Guided
flows remain accessible from the sidebar "Flows" section.

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

frontend/src/components/dashboard/StartSessionInput.tsx

@@ -44,7 +44,7 @@ export function StartSessionInput() {
     if (logContent.trim()) {
       state.logs = logContent.trim()
     }
-    navigate('/pilot', { state })
+    navigate('/assistant', { state })
   }
 
   const handleKeyDown = (e: React.KeyboardEvent) => {
@@ -55,7 +55,7 @@ export function StartSessionInput() {
   }
 
   const handleSuggestionClick = (suggestion: string) => {
-    navigate('/pilot', { state: { prefill: suggestion } })
+    navigate('/assistant', { state: { prefill: suggestion } })
   }
 
   // ── File handling ──────────────────────────────

frontend/src/components/layout/CommandPalette.tsx

@@ -177,7 +177,7 @@ export function CommandPalette({ open, onClose }: CommandPaletteProps) {
       group: 'flowpilot',
       title: 'Troubleshoot with FlowPilot',
       subtitle: trimmed,
-      path: '/pilot',
+      path: '/assistant',
       icon: 'sparkles',
     }