Refactor NotificationBadge to shared MVVM (#33843)

* Refactor NotificationBadge to shared MVVM

* Added snapshot images

* Replace legacy NotificationBadge with adapter

* Fix Eslint

* Use regular NotificationBadge prop names

* Remove legacy NotificationBadge selectors

* Update TAC badge Playwright selectors

* Rename NotificationBadgeAdapter to NotificationBadge

Addresses review feedback: the component is the app-facing badge, not an
adapter, so name it NotificationBadge.

* Make NotificationBadgeView isClickable a required boolean

Addresses review feedback: there is no semantic difference between
`isClickable: false` and `isClickable: undefined` (both render the
non-interactive variant), so the field should be a plain boolean. The
view model always provides it.

* Drop redundant comparison guards in NotificationBadge view model setters

Addresses review feedback: Snapshot.merge already compares each field
with Object.is and only emits when something actually changed, so the
manual equality guards in each setter were redundant. Recompute the
snapshot unconditionally and let merge dedupe.

* Resolve notification badge labels inside NotificationBadgeView

Addresses review feedback: static UI labels belong in the view, not the
snapshot. The view now resolves the knock and unsent-message strings via
useI18n, and the snapshot exposes a showUnsentTooltip boolean instead of
a prebuilt tooltipLabel (and drops knockLabel entirely). Adds the
room|knock_sent and notifications|message_didnt_send keys to the
shared-components i18n catalogue so they resolve in tests and storybook.

* Remove unused translation because of shared components movement

* Fix typescript issue

* Fix lint issue

* Remove unused notification badge count setting

* Pass notification badge class names explicitly

apps/web/playwright/e2e/spaces/threads-activity-centre/index.ts

@@ -302,11 +302,6 @@ export class Helpers {
      * @param content - the expected rooms and their notification levels
      */
     async assertRoomsInTac(content: Array<{ room: string; notificationLevel: "highlight" | "notification" }>) {
-        const getBadgeClass = (notificationLevel: "highlight" | "notification") =>
-            notificationLevel === "highlight"
-                ? "mx_NotificationBadge_level_highlight"
-                : "mx_NotificationBadge_level_notification";
-
         // Ensure that we have the right number of rooms
         await expect(this.getTacPanel().getByRole("menuitem")).toHaveCount(content.length);
 
@@ -317,7 +312,7 @@ export class Helpers {
             // Ensure that the room name are correct
             await expect(roomLocator).toHaveText(new RegExp(room));
             // There is no accessibility marker for the StatelessNotificationBadge
-            await expect(roomLocator.locator(`.${getBadgeClass(notificationLevel)}`)).toBeVisible();
+            await expect(roomLocator.locator(`[data-notification-level="${notificationLevel}"]`)).toBeVisible();
         }
     }