Replace checkboxes with Compound checkboxes, and appropriately label each checkbox. (#29363)

* Fix labelling of avatar menu

* Make the integration manager toggle more clear.

* fix label

* lint

* Update snapshots.

* Refactor many cases of checkbox to use the new compound component.

* Remove non-checkbox related changes

* Reset some things

* Remove usages of mx_checkbox* styling.

* Use label locators for apperance tests.

* small linter tweaks

* lint

* update screenshot

* Test updates

* lint

* Realign checkboxes for device selection.

* Fixup QuickSettings styling

* remove comment

* lint

* flex comment

* remove unused label

* remove redundant classes

* add test for spaces

* lint

* Copyright

* fixup spaces test

* spaces lint

* Replace pin with compound pin.

* Realign icons

* Remove hack for colouring icons

* Adjust existing rooms component to correctly label room.

* Add test for adding an existing room to an existing space.

* Set deterministic sort order for rooms

* lint

playwright/e2e/settings/appearance-user-settings-tab/appearance-user-settings-tab.spec.ts

@@ -1,5 +1,5 @@
 /*
-Copyright 2024 New Vector Ltd.
+Copyright 2024,2025 New Vector Ltd.
 Copyright 2023 Suguru Hirahara
 
 SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
@@ -50,8 +50,8 @@ test.describe("Appearance user settings tab", () => {
         // Click "Show advanced" link button
         await tab.getByRole("button", { name: "Show advanced" }).click();
 
-        await tab.locator(".mx_Checkbox", { hasText: "Use bundled emoji font" }).click();
-        await tab.locator(".mx_Checkbox", { hasText: "Use a system font" }).click();
+        await tab.getByLabel("Use bundled emoji font").click();
+        await tab.getByLabel("Use a system font").click();
 
         // Assert that the font-family value was removed
         await expect(page.locator("body")).toHaveCSS("font-family", '""');