fix(code): restore zoom after external resize

[richardsolomou]

Problem

External window managers such as Magnet or Rectangle can resize the Electron window without emitting the manual-resize completion event. Chromium can reset the visible zoom to 100% while the app still tracks the previous level, so the next zoom input jumps from a stale baseline.

Why: Window snapping should not change the visible app zoom or desynchronise it from the stored level.

Closes #2959

Changes

Restore the current in-memory zoom after every Electron resize event, but only call setZoomLevel when Chromium has diverged from it. Ignore queued work after renderer teardown and keep wheel zoom changes serialized with restoration.

How did you test this?

• Added regression coverage for delayed external resets, spaced resize storms, both resize event variants, wheel zoom races, and renderer teardown.
• pnpm --filter code exec vitest run src/main/zoom.test.ts
• pnpm turbo typecheck --filter=@posthog/code
• pnpm exec biome check apps/code/src/main/zoom.ts apps/code/src/main/zoom.test.ts

Automatic notifications

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

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Created with PostHog Code

[trunk-io]

😎 Merged manually by @richardsolomou - details.

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 0f7864e.}

[posthog]

✅ Visual changes approved by @richardsolomou — baseline updated in 0f7864e.

View this run in PostHog

1 changed.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "fix(code): avoid redundant zoom restorat..." | Re-trigger Greptile}