fix: refine desktop sidebar and prompt anchor

.changeset/compact-prompt-anchor.md

@@ -2,4 +2,4 @@
 "@pymodel/pythinker-code": patch
 ---
 
-Make the chat prompt anchor a compact line index that expands to prompt labels.
+Make the chat prompt anchor a compact line index that opens prompt and response previews.

.changeset/show-desktop-update-card.md

@@ -2,4 +2,4 @@
 "@pymodel/pythinker-code": patch
 ---
 
-Show available desktop updates in a sidebar card with compact download progress.
+Show available desktop updates as a sidebar button with release notes and update controls.

apps/desktop/src/window-options.ts

@@ -5,6 +5,7 @@ export function windowAppearanceOptions(platform: NodeJS.Platform): BrowserWindo
     return {
       autoHideMenuBar: true,
       titleBarStyle: 'hiddenInset',
+      titleBarOverlay: true,
       trafficLightPosition: { x: 16, y: 16 },
       // A transparent NSWindow is non-opaque with a clear background, which
       // removes native corners and shadow. Vibrancy does not require it.

apps/desktop/tests/window-appearance.spec.ts

@@ -11,6 +11,7 @@ describe('desktop window appearance configuration', () => {
 
     expect('frame' in opts).toBe(false)
     expect(opts['titleBarStyle']).toBe('hiddenInset')
+    expect(opts['titleBarOverlay']).toBe(true)
     expect(opts['trafficLightPosition']).toEqual({ x: 16, y: 16 })
     // Native corners and shadow require an opaque window.
     expect('transparent' in opts).toBe(false)

apps/pythinker-code/dist-web/.web-bundle-manifest.json

@@ -1,4 +1,4 @@
 {
-  "sourceHash": "f88e4160eddd99fef98d31820eb0a5e660fc8209a97edb99e62b445d7f9b7365",
-  "sourceFileCount": 403
+  "sourceHash": "ad0be8811299a96afcfa243941b6812309cf4597345759fac292edbcf7dea1e4",
+  "sourceFileCount": 404
 }