Remove dead code found by Periphery on all platforms

Delete declarations that Periphery reports unused on every platform that
compiles them (iOS, macOS, tvOS), including nine views used only by their
own previews. Platform-gated code still used on another platform, device-
only MPV render paths, migration models, CloudKit record names, App
Intents metadata and unused parameters are kept.

Yattee/Services/MediaSources/SMBBridge/SMBBridgeWrapper.swift

@@ -39,24 +39,6 @@ enum SMBBridgeError: Error, LocalizedError, Sendable {
             return "Invalid parameters provided"
         }
     }
-    
-    /// User-friendly error messages based on common SMB errors
-    var userFriendlyMessage: String {
-        switch self {
-        case .connectionFailed(let msg) where msg.contains("errno: 13"):
-            return "Permission denied. Check username and password."
-        case .connectionFailed(let msg) where msg.contains("errno: 2"):
-            return "Share or path not found."
-        case .connectionFailed(let msg) where msg.contains("errno: 110"):
-            return "Connection timed out. Check server address and network."
-        case .connectionFailed(let msg) where msg.contains("errno: 111"):
-            return "Cannot reach server. Check server address."
-        case .listingFailed(let msg) where msg.contains("errno: 13"):
-            return "Access denied to this folder."
-        default:
-            return errorDescription ?? "Unknown error"
-        }
-    }
 }
 
 /// SMB protocol version for connection preferences (Swift wrapper).