feat(ai): split shared provider config from Anki runtime

src/anki-integration/ai.test.ts

@@ -0,0 +1,64 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import { resolveSentenceBackText } from './ai';
+
+test('resolveSentenceBackText returns secondary subtitle when ai is disabled', async () => {
+  const result = await resolveSentenceBackText(
+    {
+      sentence: '日本語',
+      secondarySubText: 'existing translation',
+      aiEnabled: false,
+      aiConfig: {},
+    },
+    {
+      logWarning: () => undefined,
+    },
+  );
+
+  assert.equal(result, 'existing translation');
+});
+
+test('resolveSentenceBackText uses shared ai config when enabled', async () => {
+  const result = await resolveSentenceBackText(
+    {
+      sentence: '日本語',
+      secondarySubText: '',
+      aiEnabled: true,
+      aiConfig: {
+        enabled: true,
+        apiKey: 'abc',
+        model: 'openai/gpt-4o-mini',
+      },
+    },
+    {
+      logWarning: () => undefined,
+      translateSentence: async (request) => {
+        assert.equal(request.apiKey, 'abc');
+        assert.equal(request.model, 'openai/gpt-4o-mini');
+        return 'translated';
+      },
+    },
+  );
+
+  assert.equal(result, 'translated');
+});
+
+test('resolveSentenceBackText falls back to sentence when ai translation fails with no secondary subtitle', async () => {
+  const result = await resolveSentenceBackText(
+    {
+      sentence: '日本語',
+      aiEnabled: true,
+      aiConfig: {
+        enabled: true,
+        apiKey: 'abc',
+      },
+    },
+    {
+      logWarning: () => undefined,
+      translateSentence: async () => null,
+    },
+  );
+
+  assert.equal(result, '日本語');
+});