Ground-truth reapply of PR #40414 by @liuhao1024. The original branch
predates the ts-ify migration and implemented the gesture by injecting
a DOM wheel listener via executeJavaScript + a new IPC channel. Current
Electron surfaces the modifier+wheel gesture natively as the main-process
webContents 'zoom-changed' event, so the salvage uses that instead:
no renderer injection, no new preload surface, no new IPC channel.
The handler routes through setAndPersistZoomLevel — the same
persist+notify funnel as the keyboard shortcuts — so wheel zoom uses
the same 0.1 half-step, persists to zoom-state.json across restarts,
and keeps the settings Scale control in sync. Session windows get the
gesture automatically via wireCommonWindowHandlers; the pet overlay
stays opted out via zoomWiringForWindowKind.
liuhao1024
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