refactor(casting): remove AirPlay references, keep extensible architecture

- Remove AirPlay from CastProtocol type union (Chromecast only for now)
- Replace AirPlay TODOs with generic 'Future: Add X for other protocols' comments
- Remove PROTOCOL_COLORS export, use hardcoded Chromecast color (#F9AB00)
- Update all component headers to be protocol-agnostic
- Keep switch statements extensible for future protocol additions
- Maintain clean architecture for easy integration of new casting protocols

Architecture remains flexible for future protocols (AirPlay, DLNA, etc.)

utils/casting/helpers.ts

@@ -1,6 +1,6 @@
 /**
  * Unified Casting Helper Functions
- * Common utilities for both Chromecast and AirPlay
+ * Common utilities for casting protocols
  */
 
 import type { CastProtocol, ConnectionQuality } from "./types";
@@ -110,8 +110,7 @@ export const getProtocolName = (protocol: CastProtocol): string => {
   switch (protocol) {
     case "chromecast":
       return "Chromecast";
-    case "airplay":
-      return "AirPlay";
+    // Future: Add cases for other protocols
   }
 };
 
@@ -124,8 +123,7 @@ export const getProtocolIcon = (
   switch (protocol) {
     case "chromecast":
       return "tv";
-    case "airplay":
-      return "logo-apple";
+    // Future: Add icons for other protocols
   }
 };
 

utils/casting/types.ts

@@ -1,9 +1,10 @@
 /**
  * Unified Casting Types and Options
- * Abstracts Chromecast and AirPlay into a common interface
+ * Protocol-agnostic casting interface - currently supports Chromecast
+ * Architecture allows for future protocols (AirPlay, DLNA, etc.)
  */
 
-export type CastProtocol = "chromecast" | "airplay";
+export type CastProtocol = "chromecast";
 
 export interface CastDevice {
   id: string;
@@ -79,9 +80,3 @@ export const DEFAULT_CAST_STATE: CastPlayerState = {
 };
 
 export type ConnectionQuality = "excellent" | "good" | "fair" | "poor";
-
-// Protocol-specific colors for UI differentiation
-export const PROTOCOL_COLORS = {
-  chromecast: "#e50914", // Red (Google Cast)
-  airplay: "#007AFF", // Blue (Apple)
-} as const;