Fix SwiftLint and SwiftFormat violations

- Run SwiftFormat to fix indentation, spacing, and formatting issues
- Replace CGFloat with Double and NSRect with CGRect per style guide
- Remove redundant .center alignment specifications
- Remove unnecessary @available checks for satisfied deployment targets
- Fix closure brace indentation for consistency
- Disable closure_end_indentation rule to resolve SwiftFormat conflict

All linting checks now pass with zero errors and warnings.

Shared/Channels/ChannelVideosView.swift

@@ -186,11 +186,7 @@ struct ChannelVideosView: View {
                 .background(Color.background(scheme: colorScheme))
                 .focusScope(focusNamespace)
         #elseif os(macOS)
-            if #available(macOS 12.0, *) {
-                return content.focusScope(focusNamespace)
-            } else {
-                return content
-            }
+            return content.focusScope(focusNamespace)
         #else
             return content
         #endif