Improve terminal and UI experience

- Open all terminals in editor area (first column) instead of panel
- Update login message to mention Claude plan (Pro/Max) and API key
- Hide "Claude Code Chat" title when window is very small (<350px)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/ui-styles.ts

@@ -28,6 +28,12 @@ const styles = `
         letter-spacing: -0.3px;
     }
 
+    @media (max-width: 385px) {
+        .header h2 {
+            display: none;
+        }
+    }
+
     .controls {
         display: flex;
         gap: 6px;