feat(shell): zoom shortcuts on Windows and Linux (#1109) (#1623)

* feat(shell): zoom shortcuts on Windows and Linux (#1109)

Cmd/Ctrl and +/−/0 (numpad included) now zoom the app on every platform.
Windows/Linux run without a menu (`setMenu(null)`), so the shortcuts are a
renderer key binding in `WorkspaceKeyboardShortcutsService` calling a new
synchronous, preload-local bridge method `adjustZoomLevel`, which steps the
frame-bound temporary level through `webFrame.setZoomLevel` — never a
main-process `webContents.setZoomLevel`, whose per-URL entry the app's
`file://` path routing resets. Step and limits live in
`libs/shared/interfaces` (`stepZoomLevel`: 0.5 per press like Electron's
zoomIn/zoomOut roles, clamped to levels −4…6). On macOS the renderer sees the
key before the application menu, and `preventDefault()` keeps the menu role
from stepping a second time (Electron only performs the menu key equivalent
in its unhandled-keyboard-event hook).

Persistence is unchanged: the main process still reads the live level back
on close, quit and reload. The zoom E2E now drives the real shortcuts (in,
out, numpad, reset). Help dialog entries added and translated for all
locales; contract updated in docs/architecture/workspace-shell.md.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* fix(shell): never step a stored out-of-range zoom level against the request

A level persisted before the shortcuts existed (the macOS menu roles never
clamped, and the store restores any finite level) was clamped BEFORE the
step, so the first zoom-in from level 7 rendered smaller. Step from the raw
level instead: a press further out leaves an out-of-range level where it is,
a press back in lands on the limit.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* docs(shell): state the zoom bridge's return contract precisely

`adjustZoomLevel` steps by `stepZoomLevel`'s rules; a stored out-of-range
level is never moved against the request, so the returned level is not
itself guaranteed to be within `ZOOM_LEVEL_MIN..ZOOM_LEVEL_MAX`.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* docs(release): add a release note for the zoom shortcuts

The Release note gate requires an added `.changes/*.md` for runtime changes;
the shortcuts are a user-visible feature of their own, so they get their own
note and the persistence note stays about persistence.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

libs/shared/interfaces/src/lib/electron-api.interface.ts

@@ -1,6 +1,7 @@
 import type { AppUpdateChannel } from './app-update-channel.util';
 import type { SourceProbeContext, SourceHealthResult } from './source-health';
 import type { XtreamConnectionFailure } from './xtream-connection-test';
+import type { ZoomLevelAction } from './zoom-level.util';
 import type {
     CatchupDownloadMetadata,
     DownloadRecoveryResult,
@@ -718,6 +719,19 @@ export interface ElectronBridgeApi {
      */
     toggleFullScreenWindow: () => Promise<ElectronBridgeWindowState>;
     closeWindow: () => Promise<void>;
+    /**
+     * Zoom shortcuts (Cmd/Ctrl and +/−/0). Synchronous and preload-local:
+     * steps the FRAME-BOUND temporary zoom level through `webFrame` (never a
+     * main-process `webContents.setZoomLevel`, whose per-URL entry the app's
+     * `file://` path routing resets — issue #1109) by `stepZoomLevel`'s
+     * rules — one `ZOOM_LEVEL_STEP` inside `ZOOM_LEVEL_MIN..ZOOM_LEVEL_MAX`,
+     * a stored level already outside them never moved against the request —
+     * and returns the level now applied, which is therefore not itself
+     * guaranteed to be within the limits. Persistence needs nothing from the
+     * caller: the main process reads the live level back on close, quit and
+     * reload.
+     */
+    adjustZoomLevel: (action: ZoomLevelAction) => number;
     getWindowState: () => Promise<ElectronBridgeWindowState>;
     onWindowStateChange: (
         callback: (state: ElectronBridgeWindowState) => void