refactor: split main runtime flows into focused modules

src/main/runtime/jellyfin-cli-remote-announce.ts

@@ -0,0 +1,35 @@
+import type { CliArgs } from '../../cli/args';
+
+type JellyfinRemoteSession = {
+  advertiseNow: () => Promise<boolean>;
+};
+
+export function createHandleJellyfinRemoteAnnounceCommand(deps: {
+  startJellyfinRemoteSession: () => Promise<void>;
+  getRemoteSession: () => JellyfinRemoteSession | null;
+  logInfo: (message: string) => void;
+  logWarn: (message: string) => void;
+}) {
+  return async (args: CliArgs): Promise<boolean> => {
+    if (!args.jellyfinRemoteAnnounce) {
+      return false;
+    }
+
+    await deps.startJellyfinRemoteSession();
+    const remoteSession = deps.getRemoteSession();
+    if (!remoteSession) {
+      deps.logWarn('Jellyfin remote session is not available.');
+      return true;
+    }
+
+    const visible = await remoteSession.advertiseNow();
+    if (visible) {
+      deps.logInfo('Jellyfin cast target is visible in server sessions.');
+    } else {
+      deps.logWarn(
+        'Jellyfin remote announce sent, but cast target is not visible in server sessions yet.',
+      );
+    }
+    return true;
+  };
+}