Some random tweaks made on a train 🚆 (#4636)

* Fix the search text field's tint colour.

* Don't allow optional content IDs in the placeholder avatar.

* Use SwiftUI to resolve the hex values in the Inspector app.

This fixes incorrect values being shown in dark/high-contrast modes.

* Fix a layout bug with the colour swatch in the Inspector app on iPhone.

* Switch to the chats tab when selecting a room with the global search screen.

* Run the latest SwiftFormat.

ElementX/Sources/Screens/Timeline/View/Threads/TimelineThreadSummaryView.swift

@@ -133,7 +133,7 @@ struct TimelineThreadSummaryView: View {
                 
                 LoadableAvatarImage(url: sender?.avatarURL,
                                     name: sender?.displayName,
-                                    contentID: sender?.id,
+                                    contentID: senderID,
                                     avatarSize: .user(on: .threadSummary),
                                     mediaProvider: context.mediaProvider)
                     .accessibilityHidden(true)