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/Settings/QualitySettings.swift

@@ -183,17 +183,10 @@ struct QualitySettings: View {
         }
 
         #if os(macOS)
-            if #available(macOS 12.0, *) {
-                List {
-                    list
-                }
-                .listStyle(.inset(alternatesRowBackgrounds: true))
-            } else {
-                List {
-                    list
-                }
-                .listStyle(.inset)
+            List {
+                list
             }
+            .listStyle(.inset(alternatesRowBackgrounds: true))
         #else
             list
         #endif