feat: update UI components and styles for improved user experience

- Removed obsolete PDF file from the mock directory.
- Updated index.html to change the favicon and title for the application.
- Deleted unused vite.svg file and replaced it with shapes.svg.
- Enhanced App component layout and styling.
- Refined Form1 component with better spacing and updated styles.
- Improved Form2 component to enhance item selection UI and responsiveness.
- Updated Form4 component to improve loan display and interaction.
- Enhanced Header component styling for better visibility.
- Refined LoginForm component for a more modern look.
- Updated Object component styles for better text visibility.
- Improved Sidebar component layout and item display.
- Updated global CSS for better touch target improvements.
- Enhanced Layout component for better responsiveness and structure.
- Updated main.tsx to change toast notification theme.
- Updated tailwind.config.js to include index.html for Tailwind CSS processing.

frontend/src/App.tsx

@@ -22,14 +22,12 @@ function App() {
     localStorage.setItem("borrowableItems", JSON.stringify([]));
   }, []);
 
-  // Mock flow without real logic: show the three sections stacked for design preview
   const handleLogout = () => {
     Cookies.remove("token");
     localStorage.removeItem("allItems");
     localStorage.removeItem("allLoans");
     localStorage.removeItem("userLoans");
     localStorage.removeItem("borrowableItems");
-    // Let listeners refresh from empty state
     window.dispatchEvent(new Event(ALL_ITEMS_UPDATED_EVENT));
     myToast("Logged out successfully!", "success");
     setIsLoggedIn(false);
@@ -37,11 +35,11 @@ function App() {
 
   return isLoggedIn ? (
     <Layout onLogout={handleLogout}>
-      <div className="space-y-10">
+      <div className="space-y-6">
         <Form1 />
-        <div className="h-px bg-blue-100" />
+        <div className="h-px bg-slate-200" />
         <Form2 />
-        <div className="h-px bg-blue-100" />
+        <div className="h-px bg-slate-200" />
         <Form4 />
       </div>
     </Layout>