refactor: streamline frontend language and shared UI utilities

tests/test_frontend_contract.py

@@ -23,6 +23,7 @@ class FrontendContractTests(unittest.TestCase):
     def setUpClass(cls) -> None:
         cls.html = (STATIC_DIR / "index.html").read_text(encoding="utf-8")
         cls.script = (STATIC_DIR / "app.js").read_text(encoding="utf-8")
+        cls.ui_core = (STATIC_DIR / "ui-core.js").read_text(encoding="utf-8")
         collector = IdCollector()
         collector.feed(cls.html)
         cls.ids = collector.ids
@@ -49,6 +50,28 @@ class FrontendContractTests(unittest.TestCase):
         self.assertIn('document.querySelector("#sectorPhaseManager").hidden = !isAdmin;', self.script)
         self.assertIn('const canManage = state.user?.role === "admin";', self.script)
 
+    def test_shared_ui_core_loads_before_application(self):
+        self.assertLess(
+            self.html.index('<script src="/ui-core.js"'),
+            self.html.index('<script src="/app.js"'),
+        )
+        for function_name in (
+            "number", "clamp", "escapeHtml", "formatNumber", "formatTimestamp",
+            "displayCompactDate", "todayString", "localDateString", "parseLocalDate",
+        ):
+            self.assertIn(f"function {function_name}(", self.ui_core)
+
+    def test_business_views_do_not_expose_engineering_source_labels(self):
+        prohibited = (
+            "Tushare 实时行情",
+            "Tushare 日K",
+            "SQLite 缓存",
+            "演示日K",
+            "rt_k 实时截面",
+        )
+        for label in prohibited:
+            self.assertNotIn(label, self.script)
+
 
 if __name__ == "__main__":
     unittest.main()