App Polish (#1098)

* App polish

- Skeleton avatar colour on app switching.
- Bug report icon and string.
- Semi-bold font on room list timestamps.
- Room attachments button spacing and alignment.
- Replace link tint with semi-bold font in AnalyticsSettingsScreen.
- Semi-bold font on Invites button.
- Add padding to media attachment sheet.
- Message composer header layout tweaks.
- Remove indicator after changing homeserver with an MXID.
- Change copy permalink string.
- Formatting of link in Analytics Prompt.
- Remove indicator after changing homeserver with an MXID.
- Change copy permalink string.
- Formatting of link in Analytics Prompt.
- Only semi-bold the room timestamp when unread.
- Tweak the colour of the date separator.
- Add activity indicator to toast style user indicator.

ElementX/Sources/Other/SwiftUI/Views/PlaceholderAvatarImage.swift

@@ -25,7 +25,7 @@ struct PlaceholderAvatarImage: View {
     var body: some View {
         GeometryReader { geometry in
             ZStack(alignment: .center) {
-                bgColor
+                backgroundColor
                 
                 // This text's frame doesn't look right when redacted
                 if redactionReasons != .placeholder {
@@ -47,8 +47,8 @@ struct PlaceholderAvatarImage: View {
         self.contentID = contentID
     }
 
-    private var bgColor: Color {
-        if redactionReasons == .placeholder {
+    private var backgroundColor: Color {
+        if redactionReasons.contains(.placeholder) {
             return Color(.systemGray4) // matches the default text redaction
         }