refactor: split main runtime flows into focused modules

src/main/runtime/initial-args-handler.ts

@@ -0,0 +1,39 @@
+import type { CliArgs } from '../../cli/args';
+
+type MpvClientLike = {
+  connected: boolean;
+  connect: () => void;
+};
+
+export function createHandleInitialArgsHandler(deps: {
+  getInitialArgs: () => CliArgs | null;
+  isBackgroundMode: () => boolean;
+  ensureTray: () => void;
+  isTexthookerOnlyMode: () => boolean;
+  hasImmersionTracker: () => boolean;
+  getMpvClient: () => MpvClientLike | null;
+  logInfo: (message: string) => void;
+  handleCliCommand: (args: CliArgs, source: 'initial') => void;
+}) {
+  return (): void => {
+    const initialArgs = deps.getInitialArgs();
+    if (!initialArgs) return;
+
+    if (deps.isBackgroundMode()) {
+      deps.ensureTray();
+    }
+
+    const mpvClient = deps.getMpvClient();
+    if (
+      !deps.isTexthookerOnlyMode() &&
+      deps.hasImmersionTracker() &&
+      mpvClient &&
+      !mpvClient.connected
+    ) {
+      deps.logInfo('Auto-connecting MPV client for immersion tracking');
+      mpvClient.connect();
+    }
+
+    deps.handleCliCommand(initialArgs, 'initial');
+  };
+}