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

src/main/runtime/yomitan-settings-runtime.test.ts

@@ -0,0 +1,31 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createYomitanSettingsRuntime } from './yomitan-settings-runtime';
+
+test('yomitan settings runtime composes opener with built deps', async () => {
+  let existingWindow: { id: string } | null = null;
+  const calls: string[] = [];
+
+  const runtime = createYomitanSettingsRuntime({
+    ensureYomitanExtensionLoaded: async () => ({ id: 'ext' }),
+    openYomitanSettingsWindow: ({ getExistingWindow, setWindow }) => {
+      calls.push('open-window');
+      const current = getExistingWindow();
+      if (!current) {
+        setWindow({ id: 'settings' });
+      }
+    },
+    getExistingWindow: () => existingWindow as never,
+    setWindow: (window) => {
+      existingWindow = window as { id: string } | null;
+    },
+    logWarn: (message) => calls.push(`warn:${message}`),
+    logError: (message) => calls.push(`error:${message}`),
+  });
+
+  runtime.openYomitanSettings();
+  await new Promise((resolve) => setTimeout(resolve, 0));
+
+  assert.deepEqual(existingWindow, { id: 'settings' });
+  assert.deepEqual(calls, ['open-window']);
+});