fix(automation): Switch to Build Mode for Backend Generation

- Modified Views.tsx to keep the user in GlobalMode.Build instead of switching to Chat when generating a backend.
- Added intelligent system prompt routing in LayoutComponents.tsx for [BACKEND_REQUEST] to ensure the AI knows how to generate a server.js file.

bin/goose-ultra-final/src/components/LayoutComponents.tsx

@@ -2470,7 +2470,19 @@ Format: { "ideas": [{ "title": "Short Title", "subtitle": "One line", "tag": "To
         (window as any)._redesignApprovedSessions[state.activeProject.id] = true;
       }
 
-      if (isQaFailureArtifact) {
+      const isBackendRequest = userPrompt.includes('[BACKEND_REQUEST]');
+
+      if (isBackendRequest) {
+        // --- BACKEND GENERATION MODE ---
+        systemPrompt = `[SYSTEM INSTRUCTION]: BACKEND GENERATION REQUEST.
+        
+The user wants to generate a server-side implementation for the existing frontend.
+1. Analyze the provided frontend code in the user prompt.
+2. Identify all API endpoints and data structures.
+3. Propose a plan to create a 'server.js' (Node.js/Express) file.
+4. The plan MUST start with '[PLAN]'.
+5. Do NOT modify the frontend code. Only build the backend.`;
+      } else if (isQaFailureArtifact) {
         // --- REPAIR MODE (F3: Retention & Match) ---
         // "Broken frontend is treated as a REPAIR task"
         const originalIntent = state.activeProject?.originalPrompt || "Unknown Intent";

bin/goose-ultra-final/src/components/Views.tsx

@@ -1452,8 +1452,8 @@ Start with "# 🔧 Repair Plan" and be concise.`;
                                 return;
                             }
 
-                            // Switch to Chat to show progress
-                            dispatch({ type: 'SET_MODE', mode: GlobalMode.Chat });
+                            // Switch to Build mode (Plan tab) to show progress
+                            dispatch({ type: 'SET_MODE', mode: GlobalMode.Build });
                             dispatch({ type: 'SET_TAB', tab: TabId.Plan });
 
                             const prompt = `[BACKEND_REQUEST]