fix(desktop): support JIS keyboard zoom shortcut

[katanumahotori]

Summary

Adds JIS/Japanese keyboard-friendly zoom-in handling to the desktop zoom shortcut fallback.

The existing desktop zoom shortcut handler (from #37894) rejects all shifted inputs. On JIS keyboards, typing + commonly requires Shift, and Electron can surface that physical key path as ; or : depending on the layout/input state. This means Windows users on Japanese keyboards can still miss the zoom-in shortcut even though Ctrl+- and Ctrl+0 work.

This PR keeps the existing zoom behavior and only broadens zoom-in recognition:

• keep requiring Ctrl/Cmd
• keep ignoring Alt-modified shortcuts
• keep Ctrl+=, Ctrl++, and numpad Add as zoom-in
• add shifted ; / : as zoom-in for JIS/Japanese keyboards
• keep zoom-out as unshifted -
• keep reset as unshifted 0

Related

Follow-up to #37894 and related to #37917 / #37619. I also checked for existing Japanese/JIS-specific issues or PRs and did not find a duplicate.

Validation

• node --check apps/desktop/electron/main.cjs
• Built the Windows desktop package locally with python -m hermes_cli.main desktop --build-only
• Confirmed apps/desktop/release/win-unpacked/Hermes.exe exists and launches on Windows

[teknium1]

Thanks for identifying the Shift guard in the zoom fallback. The premise still exists on current main: apps/desktop/electron/main.ts:4809 returns before handling any Shift-modified shortcut.

Problems

• The PR edits apps/desktop/electron/main.cjs, but that file was renamed to apps/desktop/electron/main.ts by 39d09453f; current main has no tracked main.cjs. The patch therefore needs a manual port to main.ts:4806.
• The added JIS/numpad key paths have no focused test coverage. apps/desktop/electron/zoom.test.ts currently covers helpers and wiring, not before-input-event key/modifier recognition.

Suggested changes

• Port the widened zoom-in predicate to apps/desktop/electron/main.ts, retaining setAndPersistZoomLevel at lines 4817-4823.
• Add coverage for shifted ;/:, =, +, Add, and rejected shifted reset/zoom-out combinations.

Automated hermes-sweeper review.

[teknium1]

Current main no longer tracks main.cjs: commit 39d09453f renamed it to apps/desktop/electron/main.ts. Please port this predicate to the current installZoomShortcuts handler there, preserving its setAndPersistZoomLevel calls.