Use more Liquid Glass in the room/space screen toolbars (#4965)

* Add a glass style to the Room/Space header view on iOS 26.

* Update snapshots and fix the join call button.

AccessibilityTests/Sources/GeneratedAccessibilityTests.swift

@@ -755,10 +755,6 @@ extension AccessibilityTests {
         try await performAccessibilityAudit(named: "TimelineThreadSummaryView_Previews")
     }
 
-    func testTimelineView() async throws {
-        try await performAccessibilityAudit(named: "TimelineView_Previews")
-    }
-
     func testTombstonedAvatarImage() async throws {
         try await performAccessibilityAudit(named: "TombstonedAvatarImage_Previews")
     }