refactor(main): split main.ts into focused runtime modules (#123)

src/main/runtime/yomitan-anki-server-sync.test.ts

@@ -0,0 +1,18 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { buildYomitanAnkiSettingsKey } from './yomitan-anki-server-sync';
+
+test('buildYomitanAnkiSettingsKey includes force override policy', () => {
+  assert.notEqual(
+    buildYomitanAnkiSettingsKey({
+      targetUrl: 'http://127.0.0.1:8766',
+      targetDeck: 'Mining',
+      forceOverride: false,
+    }),
+    buildYomitanAnkiSettingsKey({
+      targetUrl: 'http://127.0.0.1:8766',
+      targetDeck: 'Mining',
+      forceOverride: true,
+    }),
+  );
+});