fix(shell): persist the app zoom level as frame-bound temporary zoom (#1109) (#1617)

* fix(shell): persist and restore the app zoom level (#1109)

The app-wide zoom (Cmd/Ctrl and +/-) was never saved, so it reset to the
default on every restart. Save the webContents zoom level next to the window
bounds on window close and before quit, and reapply it once the renderer
finishes loading. webContents zoom is per-host, so the restored level then
holds across in-app section navigation (SPA route changes never reload).

* fix(shell): restore the zoom level as frame-bound temporary zoom (#1109)

Under file:// Chromium keys zoom by the full URL, and the packaged
renderer routes with pushState, so a level applied through
webContents.setZoomLevel belongs to index.html only: the first resize
after a section change snapped the renderer back to the default, and
the close handler read the current route's entry (usually 0) over the
user's choice. The preload now applies the persisted level with
webFrame.setZoomLevel, a temporary zoom bound to the frame that survives
in-page navigation and resizes; the main process hands it over through
the synchronous WINDOW:GET_ZOOM_LEVEL IPC and writes the live level back
on close, before-quit and before every cross-document navigation, since
a reload drops the temporary level.

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

* fix(shell): apply the restored zoom level at DOMContentLoaded (#1109)

A webFrame.setZoomLevel at preload start left a hidden window without a
first frame on Linux and Windows: ready-to-show never fired, the window
never showed, and the renderer got no animation frames, so the startup
splash removed in a requestAnimationFrame stayed. macOS was unaffected
and CDP-driven tests force frames, which is why only the packaged
legacy-migration E2E asserting the splash is gone caught it. Applying
once the document is parsed is harmless and still lands before the
first Angular paint; ownership of the level now follows the preload's
WINDOW:ZOOM_LEVEL_APPLIED acknowledgement instead of the request. The
release note no longer advertises Ctrl shortcuts Windows and Linux do
not have.

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

---------

Co-authored-by: Justin Willhite <5132924+thejdubb02@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

.changes/shell-zoom-level-persistence.md

@@ -0,0 +1,9 @@
+---
+type: fix
+area: shell
+issues: [1109]
+---
+
+The app now remembers your zoom level (Cmd and +/- on macOS): it holds when
+you switch between sections or resize the window, and comes back after a
+restart, so a larger font size no longer resets to the default.