fix(settings): require external player argument settings

libs/services/src/lib/settings-store.service.ts

@@ -138,10 +138,10 @@ export const SettingsStore = signalStore(
                 showExternalPlaybackBar: store.showExternalPlaybackBar!(),
                 theme: store.theme(),
                 mpvPlayerPath: store.mpvPlayerPath(),
-                mpvPlayerArguments: store.mpvPlayerArguments() ?? '',
+                mpvPlayerArguments: store.mpvPlayerArguments(),
                 mpvReuseInstance: store.mpvReuseInstance(),
                 vlcPlayerPath: store.vlcPlayerPath(),
-                vlcPlayerArguments: store.vlcPlayerArguments() ?? '',
+                vlcPlayerArguments: store.vlcPlayerArguments(),
                 vlcReuseInstance: store.vlcReuseInstance(),
                 remoteControl: store.remoteControl(),
                 remoteControlPort: store.remoteControlPort(),

libs/shared/interfaces/src/lib/settings.interface.ts

@@ -41,14 +41,14 @@ export interface Settings {
      * Extra MPV CLI arguments entered one argument per line. Applied only when
      * starting a new external MPV process.
      */
-    mpvPlayerArguments?: string;
+    mpvPlayerArguments: string;
     mpvReuseInstance: boolean;
     vlcPlayerPath: string;
     /**
      * Extra VLC CLI arguments entered one argument per line. Applied only when
      * starting a new external VLC process.
      */
-    vlcPlayerArguments?: string;
+    vlcPlayerArguments: string;
     vlcReuseInstance: boolean;
     remoteControl: boolean;
     remoteControlPort: number;