fix(desktop): render popup overlays in packaged builds

Popup pages loaded their scripts as classic <script src> tags, which the
renderer build never bundles, so an installed app rendered only the static
markup: the recording tip stayed at 0:00 with no wave bars and live captions
showed nothing.

- declare popup scripts as modules so the build emits them, and fail
  packaging when a renderer page references an asset that was never produced
- hold popup IPC until the renderer has loaded and re-assert visibility on
  every show, so a popup hidden once still appears next time
- surface popup renderer console and load failures in the main log

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4.1-flash

.github/workflows/ci.yml

@@ -169,6 +169,10 @@ jobs:
       - name: Build Target Workspace
         run: ${{ matrix.cmd }}
 
+      - name: Verify Desktop Renderer Bundles
+        if: matrix.target == 'desktop'
+        run: node scripts/ci/verify-desktop-renderer-bundles.mjs
+
   # ──────────────────────────────────────────────────────────────────
   # 4. Android x86_64 artifacts and native dependency gate
   # ──────────────────────────────────────────────────────────────────