Fix some playwright flaky tests (#12357)

* Fix flaky test `should memorize the timeline position when switch Room A -> Room B -> Room A`

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix flaky test `should be correctly rendered - high contrast theme`

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix flaky test `Cryptography › setting up secure key backup should work isDeviceVerified=false`

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update screenshots

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update screenshots

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

playwright/e2e/room/room.spec.ts

@@ -92,6 +92,10 @@ test.describe("Room Directory", () => {
 
         // Display Room B
         await app.viewRoomById(roomBId);
+
+        // Let the app settle to avoid flakiness
+        await page.waitForTimeout(500);
+
         // Display Room A
         await app.viewRoomById(roomAId);