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

src/main/runtime/subtitle-position.test.ts

@@ -0,0 +1,35 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  createLoadSubtitlePositionHandler,
+  createSaveSubtitlePositionHandler,
+} from './subtitle-position';
+
+test('createLoadSubtitlePositionHandler stores loaded value', () => {
+  let stored: unknown = null;
+  const position = { x: 10, y: 20 };
+  const load = createLoadSubtitlePositionHandler({
+    loadSubtitlePositionCore: () => position as unknown as never,
+    setSubtitlePosition: (value) => {
+      stored = value;
+    },
+  });
+  const result = load();
+  assert.equal(result, position);
+  assert.equal(stored, position);
+});
+
+test('createSaveSubtitlePositionHandler stores then persists value', () => {
+  const calls: string[] = [];
+  const position = { x: 5, y: 7 } as unknown as never;
+  const save = createSaveSubtitlePositionHandler({
+    saveSubtitlePositionCore: () => {
+      calls.push('persist');
+    },
+    setSubtitlePosition: () => {
+      calls.push('store');
+    },
+  });
+  save(position);
+  assert.deepEqual(calls, ['store', 'persist']);
+});