Fix all SwiftLint violations across codebase

Resolves 130+ violations including deployment target checks, code style issues, and formatting inconsistencies. Adds SwiftLint disable comments for compiler-required availability checks while maintaining deployment target compliance.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Model/Stream.swift

@@ -191,21 +191,21 @@ class Stream: Equatable, Hashable, Identifiable {
             return .unknown
         }
     }
-    
+
     struct AudioTrack: Hashable, Identifiable {
         let id = UUID().uuidString
         let url: URL
         let content: String?
         let language: String?
-        
+
         var displayLanguage: String {
             LanguageCodes(rawValue: language ?? "")?.description.capitalized ?? language ?? "Unknown"
         }
-        
+
         var description: String {
             "\(displayLanguage) (\(content ?? "Unknown"))"
         }
-        
+
         var isDubbed: Bool {
             content?.lowercased().starts(with: "dubbed") ?? false
         }