refactor: remove coverage report and add weather widget and navigation utility files

src/App.tsx

@@ -22,8 +22,12 @@ const LakeDetailWrapper = ({ language }: { language: Language }) => {
 };
 
 function App() {
-  const [language, setLanguage] = useState<Language>('en');
-  const [theme, setTheme] = useState<'dark' | 'light'>('dark');
+  const [language, setLanguage] = useState<Language>(() => {
+    return (localStorage.getItem('hladinator_lang') as Language) || 'en';
+  });
+  const [theme, setTheme] = useState<'dark' | 'light'>(() => {
+    return (localStorage.getItem('hladinator_theme') as 'dark' | 'light') || 'dark';
+  });
   const [isSettingsOpen, setIsSettingsOpen] = useState(false);
   const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);
 
@@ -33,6 +37,7 @@ function App() {
     } else {
       document.body.classList.remove('light-mode');
     }
+    localStorage.setItem('hladinator_theme', theme);
     
     // Clean up empty hash from URL (e.g. if the user clicked an empty anchor)
     if (window.location.href.endsWith('#')) {
@@ -40,6 +45,10 @@ function App() {
     }
   }, [theme]);
 
+  useEffect(() => {
+    localStorage.setItem('hladinator_lang', language);
+  }, [language]);
+
   return (
     <div className="dashboard-container">
       {/* Mobile overlay */}