macOS: Desktop app has no Edit menu, so ⌘V / ⌘C / ⌘X / ⌘A / ⌘Z do nothing in any text field

[wkbevill-svg]

The desktop shell installs an application menu template that contains no Edit
menu, and therefore no paste / copy / cut / selectAll / undo roles. On
macOS, Electron delivers those shortcuts as application-menu key equivalents,
so with no Edit menu the shortcuts never reach the focused text field. There is
also no context-menu handler in the shell, so right-click offers no Paste
either — as far as I can tell there is currently no way to paste into the
desktop app at all.

This blocks the documented first-run flow: Settings → Models → enter a
DeepSeek API key. The field accepts typed characters, but the key cannot be
pasted into it.

Reproduction

1. pnpm install && pnpm run build
2. pnpm run dev:desktop (Electron 44.0.0, macOS 27.0 arm64)
3. Open Settings → Models and focus the API key input
4. Copy any text, press ⌘V → nothing is inserted
5. Right-click the field → no context menu appears

Affects ⌘C, ⌘X, ⌘A and ⌘Z in every text field in the app, not just this input.
The menu template is shared, so packaged builds are affected too.

[a20070322]

Confirmed independently on macOS arm64 with Electron 44.0.0 and DSH 0.1.6-alpha.1 (source checkout 0d1f50007f).

We reproduced the failure through native UI automation: with the API address field focused in Settings → Models, the paste operation timed out waiting for the application to read the clipboard, and the field remained empty.

Adding Electron’s standard { role: 'editMenu' } alongside the existing application menu resolves the issue. After rebuilding and restarting the actual Desktop app, automation successfully pasted paste-check-123 into the session search field and verified the value through the accessibility tree. The test text was cleared afterward. We directly verified paste; we did not separately exercise every other editing shortcut.

Minimal fix, including the paired Desktop README update:
a20070322@033b122

Validation completed:

• pnpm run build:desktop
• pnpm run lint
• pnpm run doc-sync — 41 passed, 0 failed, 0 skipped
• Normal pre-push incremental typecheck
• Native macOS Electron paste verification described above

I am sharing the patch here because external PR creation is currently unavailable for this repository.