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/data/pricing.json

@@ -0,0 +1,50 @@
+{
+  "plans": [
+    {
+      "name": "Free",
+      "price": 0,
+      "period": "forever",
+      "tagline": "Get started with the basics.",
+      "features": [
+        "Up to 25 active tasks",
+        "1 list / project",
+        "Basic sort (due date, created)",
+        "Community support"
+      ],
+      "cta": "Start for free",
+      "href": "./signup.html",
+      "featured": false
+    },
+    {
+      "name": "Pro",
+      "price": 8,
+      "period": "per user / month",
+      "tagline": "For individuals who want more power.",
+      "features": [
+        "Unlimited tasks & lists",
+        "Task reminders & due-date alerts",
+        "Advanced sorting & filtering",
+        "Priority email support"
+      ],
+      "cta": "Upgrade to Pro",
+      "href": "./signup.html",
+      "featured": true
+    },
+    {
+      "name": "Team",
+      "price": 15,
+      "period": "per user / month",
+      "tagline": "For teams that ship together.",
+      "features": [
+        "Everything in Pro",
+        "Shared team lists",
+        "Role-based permissions",
+        "Integrations (Slack, Salesforce, Asana)",
+        "Dedicated support"
+      ],
+      "cta": "Start Team trial",
+      "href": "./signup.html",
+      "featured": false
+    }
+  ]
+}