Accessibility: Focus order and tab stops issues in Settings UI

# Accessibility: Inconsistent focus order/tab stops due to Focusable/IsTabStop overrides (ZoomIt-focused)

Problem (ZoomIt scope):
The ZoomIt settings page contains a top-level `SettingsPageControl` with `IsTabStop="False"` and other potentially focus-suppressing templates. These settings and custom control templates can prevent keyboard users and screen readers from reaching important controls in ZoomIt.

Impacted ZoomIt areas:
- `ZoomItPage.xaml` top-level `SettingsPageControl` uses `IsTabStop="False"`.
- `ShortcutControl` rows and action buttons inside ZoomIt cards (Break, Record, Demo) where `Focusable` or `IsTabStop` may be explicitly set by templates.

How verified:
- Reviewed `ZoomItPage.xaml` which declares `IsTabStop="False"` on the `SettingsPageControl` root; repository grep shows `ShortcutControl` and other controls manage `Focusable`/`IsTabStop` programmatically in related modules.

Steps to reproduce (ZoomIt-focused):
1. Open `Settings -> ZoomIt`.
2. Press Tab repeatedly from the module list into the ZoomIt content area and observe whether tab focus reaches expected controls (shortcuts, toggles, browse buttons).

Acceptance criteria (ZoomIt):
- Keyboard users can tab into the ZoomIt settings area and navigate controls in a logical, predictable order.

Progress (concise):
- Work started on branch `fix/zoomit-accessibility` (local). A formal PR will be opened; commit/PR links will be added to this issue when the branch is pushed.
- Test plan: `TEST_PLAN_ZOOMIT_ACCESSIBILITY.md` contains manual tab-order verification steps and references to UI test stubs.
- New findings (documented, not fixed in this issue):
- Decorative `FontIcon` glyphs in shortcut dialog may be announced redundantly by screen readers (needs investigation across other dialogs).

Notes:
- This issue now tracks the remaining verification and acceptance criteria; implementation details and commits will be referenced from a PR to avoid embedding fixes in the issue body.

Start with ZoomItPage.xaml and inspect the SettingsPageControl, ShortcutControl rows, and related templates for the focus settings named in the issue. Use TEST_PLAN_ZOOMIT_ACCESSIBILITY.md to run the manual tab-order checks. Done means keyboard users can enter the ZoomIt settings area and reach its controls in a logical, predictable order.

Written by the indexing model from the issue text.