fix(desktop): limit zoom handler to zoom keys

[Hona]

Summary

• Only handle actual zoom shortcuts in the Electron renderer zoom keydown listener.
• Stop unrelated Ctrl/Cmd hotkeys from re-sending the current zoom factor.
• Leave Electron native menu zoom roles and wheel/pinch behavior unchanged.

Testing

• bun typecheck in packages/desktop-electron
• pre-push bun turbo typecheck

[Copilot]

Pull request overview

Routes desktop zoom behavior through the renderer-controlled zoom signal/IPC bridge so menu/keyboard/wheel zoom actions no longer rely on Electron’s native zoom roles and don’t race Chromium’s built-in zoom behavior.

Changes:

• Added renderer-owned zoom helpers (zoomIn/zoomOut/zoomReset), clamping, initial zoom sync, and preventDefault() handling for keyboard + ctrl/meta wheel zoom.
• Routed macOS menu zoom items to deps.trigger("zoom.*") instead of Electron zoom roles, and handled those commands in the renderer.
• Disabled Chromium “visual zoom” in the main process via setVisualZoomLevelLimits(1, 1) (instead of resetting zoom back to 1 on zoom-changed).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
packages/desktop-electron/src/renderer/webview-zoom.ts	Adds exported zoom actions, clamps/syncs zoom, and prevents native keyboard/wheel zoom from racing renderer state.
packages/desktop-electron/src/renderer/index.tsx	Handles incoming menu zoom commands by calling renderer zoom helpers.
packages/desktop-electron/src/main/windows.ts	Replaces zoom-changed reset with disabling Chromium visual zoom limits.
packages/desktop-electron/src/main/menu.ts	Replaces Electron zoom roles with menu items that trigger renderer commands.

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