feat: Enhance dashboard with stats cards and task filtering

- Added stats cards to display active, completed, overdue, and due-today tasks on the dashboard.
- Implemented search functionality to filter tasks in real-time based on user input.
- Introduced quick-pick date buttons for easier task date selection.
- Updated task rendering logic to handle empty states for task lists.
- Improved overall user interface with new CSS styles for stat cards and buttons.

chore: Update environment variables and backend error handling

- Fixed formatting in the .env file for consistency.
- Enhanced error handling in the backend API for better debugging.

feat: Revamp frontend pages with new features and pricing sections

- Redesigned the index.html page to include a hero section and feature highlights.
- Created a new features page with dynamic loading of features from JSON.
- Implemented a pricing page that loads plans from JSON and highlights the featured plan.
- Added support and FAQ sections with dynamic content loading and contact form functionality.
- Introduced JSON files for FAQs, features, and pricing to allow easy updates without code changes.

frontend/css/styles.css

@@ -51,7 +51,9 @@ footer {
   color: var(--fg);
 }
 
-.nav-link:hover {
+.nav-link:hover,
+.navbar-nav .nav-link.active,
+.navbar-nav .nav-link.show {
   color: var(--accent);
 }
 
@@ -97,3 +99,29 @@ form a:hover {
 textarea {
   resize: none;
 }
+
+.stat-card {
+  background-color: rgba(40, 40, 40, 0.6);
+  border-radius: 0.5rem;
+  padding: 1rem;
+  text-align: center;
+  color: var(--fg);
+}
+
+.stat-card .stat-value {
+  font-size: 2rem;
+  font-weight: 700;
+  line-height: 1;
+  color: var(--accent);
+}
+
+.stat-card .stat-label {
+  font-size: 0.85rem;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  opacity: 0.7;
+}
+
+.quick-date-btn {
+  font-size: 0.85rem;
+}