fix: navbar buttons are now functional with proper routing.

[SAKTHIVELAN-27]

Related Issue

Closes #284

Summary

Added click event handlers to the navbar buttons (Dashboard, Tasks, Calendar) that were previously non-functional. Updated index.html to add IDs to nav links.

Changes Made

• Added IDs to navbar links in index.html (nav-dashboard, nav-tasks, nav-calendar)
• Added click event listeners for navbar buttons in js/app.js
• Navbar buttons now properly switch between calendar, tasks, and all-tasks views

Testing

Tested navbar button clicks to verify they navigate between sections correctly.

Checklist

• Code follows project style
• Tested locally
• No unrelated changes included

[SAKTHIVELAN-27]

Hi @Charushi06,

I have implemented the routing fixes for the navbar buttons as described in #284. The click event handlers are now working correctly and smoothly switching between the dashboard, tasks, and calendar views.

Could you please review these changes.