fix(code): persist and restore native window zoom across reloads

[richardsolomou]

Problem

Native window zoom (Cmd +/−) reset to 100% intermittently while resizing. #2003 added crash-recovery auto-reload, so a renderer hiccup during resize reloads the webContents, and native zoom was never persisted or restored.

Changes

Persist zoomLevel in window-state and re-apply it on every did-finish-load. Replaced the native zoom menu roles with handlers that persist the level, so zoom survives reloads and restarts.

How did you test this?

Ran pnpm --filter code typecheck, Biome lint on the touched files, and check-host-boundaries.mjs, all pass. Did not manually verify zoom restore in a packaged build.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit f498b04.}

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
apps/code/src/main/utils/zoom.ts:50-54
`adjustZoom` reads its baseline from `window.webContents.getZoomLevel()`, but Electron resets the webContents zoom to 0 the moment a reload begins (before `did-finish-load` fires to restore it). If the user presses Zoom In/Out during that reload window, the baseline is 0 rather than the persisted level, and the wrong value is then persisted — exactly the class of bug this PR aims to fix. Using `getSavedZoomLevel()` as the baseline makes the store the single source of truth and avoids the race.

```suggestion
// Adjust zoom by N steps and persist.
export function adjustZoom(window: ZoomableWindow, steps: number): void {
  if (window.isDestroyed()) return;
  setZoom(window, getSavedZoomLevel() + steps * ZOOM_STEP);
}
```

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