[eric] onboarding: fix Build starters opening in Agent mode (prefill-mode now wins the reset race) + quirky 4th prompt per category (minecraft, world record, fantasy quest, moon)

frontend/src/app/pages/Dashboard/DashboardToolbar.tsx

@@ -143,12 +143,15 @@ const DashboardToolbar = React.forwardRef<HTMLDivElement, Props>(
       }
       prevInputOpen.current = inputOpen;
     }, [inputOpen, settingsLoaded, defaultMode, defaultModel, defaultThinkingLevel]);
-    // A Build starter opens the composer in App Builder mode. Runs after the
-    // reset above (declaration order) so it wins; cleared back to default when
-    // prefillMode is gone (normal new chat).
+    // Prefill-driven mode: a Build starter opens the composer in App Builder mode
+    // ('view-builder'); a non-Build starter (no prefillMode) falls back to the
+    // default. Gated on inputOpen + declared last so it wins the reset effects
+    // above regardless of settings-load timing. A later manual pick survives
+    // because none of these deps change on a pick.
     useEffect(() => {
-      if (prefillMode) setMode(prefillMode);
-    }, [prefillMode]);
+      if (!inputOpen || !settingsLoaded) return;
+      setMode(prefillMode || defaultMode || 'agent');
+    }, [prefillMode, inputOpen, settingsLoaded, defaultMode]);
 
     // Writes toolbar picks through to global default; otherwise the reopen-reset effect would snap back next open.
     const promoteToDefault = useCallback(<K extends keyof AppSettings>(key: K, value: AppSettings[K]) => {

frontend/src/app/pages/Dashboard/canvas/DashboardEmptyState.tsx

@@ -26,7 +26,7 @@ const STARTER_CATEGORIES: StarterCategory[] = [
       'Find today\'s top news and summarize it for me',
       'Compare the 3 best standing desks and recommend one',
       'Plan a weekend trip to Tokyo with a day-by-day itinerary',
-      'Find the highest-rated wireless earbuds under $100',
+      'Find the strangest world record I could actually break',
     ],
   },
   {
@@ -35,7 +35,7 @@ const STARTER_CATEGORIES: StarterCategory[] = [
       'Build a focus timer that dings when the break starts',
       'Make a tip calculator that splits the bill',
       'Create a Snake game I can play right now',
-      'Build a daily habit tracker with a streak counter',
+      'Build a tiny Minecraft-style block world I can walk around in',
     ],
   },
   {
@@ -44,7 +44,7 @@ const STARTER_CATEGORIES: StarterCategory[] = [
       'Write a friendly email introducing myself to a new client',
       'Turn my rough notes into a polished update',
       'Write a product description for a coffee mug',
-      'Write a short poem about the sea',
+      'Write my morning routine as an epic fantasy quest',
     ],
   },
   {
@@ -53,7 +53,7 @@ const STARTER_CATEGORIES: StarterCategory[] = [
       'Explain how AI chatbots actually work, in plain English',
       'Teach me the basics of investing in 5 minutes',
       'Explain the stock market like I\'m five',
-      'Give me a 5-minute crash course on climate change',
+      'What would happen if the moon disappeared tomorrow?',
     ],
   },
 ];