feat(core): add Electron runtime, services, and app composition

src/main/runtime/secondary-sub-mode-runtime-handler.test.ts

@@ -0,0 +1,29 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createCycleSecondarySubModeRuntimeHandler } from './secondary-sub-mode-runtime-handler';
+
+test('secondary sub mode runtime handler composes deps for runtime call', () => {
+  const calls: string[] = [];
+  const handleCycleSecondarySubMode = createCycleSecondarySubModeRuntimeHandler({
+    cycleSecondarySubModeMainDeps: {
+      getSecondarySubMode: () => 'hidden',
+      setSecondarySubMode: () => calls.push('set-mode'),
+      getLastSecondarySubToggleAtMs: () => 10,
+      setLastSecondarySubToggleAtMs: () => calls.push('set-ts'),
+      broadcastToOverlayWindows: (channel, mode) => calls.push(`broadcast:${channel}:${mode}`),
+      showMpvOsd: (text) => calls.push(`osd:${text}`),
+    },
+    cycleSecondarySubMode: (deps) => {
+      deps.setSecondarySubMode('romaji' as never);
+      deps.broadcastSecondarySubMode('romaji' as never);
+      deps.showMpvOsd('romaji');
+    },
+  });
+
+  handleCycleSecondarySubMode();
+  assert.deepEqual(calls, [
+    'set-mode',
+    'broadcast:secondary-subtitle:mode:romaji',
+    'osd:romaji',
+  ]);
+});