Ship native iOS app, Wiki/TTS backend, and skeleton loading UX.

Replace the WebView shell with SwiftUI screens, add account-scoped Wiki and TTS APIs with adaptive review and photo scan support, and keep web/iOS pages usable while data loads asynchronously.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_word_scan_service.py

@@ -0,0 +1,37 @@
+import os
+import unittest
+from unittest.mock import patch
+
+from fastapi import HTTPException
+
+from services.word_scan_service import word_scan_service
+
+
+class WordScanServiceTest(unittest.TestCase):
+    def tearDown(self):
+        get_settings = __import__("config", fromlist=["get_settings"]).get_settings
+        get_settings.cache_clear()
+
+    def test_heuristic_parse_tab_separated_pairs(self):
+        with patch.dict(os.environ, {"DEEPSEEK_API_KEY": ""}, clear=False):
+            __import__("config", fromlist=["get_settings"]).get_settings.cache_clear()
+            items = word_scan_service.parse_scan_text("apple\t苹果\nbanana\t香蕉")
+        self.assertEqual(len(items), 2)
+        self.assertEqual(items[0]["source_text"], "apple")
+        self.assertEqual(items[0]["target_text"], "苹果")
+
+    def test_empty_text_raises(self):
+        with self.assertRaises(HTTPException) as ctx:
+            word_scan_service.parse_scan_text("   ")
+        self.assertEqual(ctx.exception.status_code, 400)
+
+    def test_unparseable_text_raises(self):
+        with patch.dict(os.environ, {"DEEPSEEK_API_KEY": ""}, clear=False):
+            __import__("config", fromlist=["get_settings"]).get_settings.cache_clear()
+            with self.assertRaises(HTTPException) as ctx:
+                word_scan_service.parse_scan_text("hello world only english")
+        self.assertEqual(ctx.exception.status_code, 422)
+
+
+if __name__ == "__main__":
+    unittest.main()