Fix navbar navigation functionality across main and support pages

[NetsNuts-24]

Related Issue

Closes #846

Summary# Summary

Fixed non-functional navbar buttons across the main dashboard and support page by connecting them to their respective existing application views and behaviors.

Changes Made

• Connected Dashboard navbar button to the default dashboard/calendar view
• Connected Tasks navbar button to existing "All Tasks" sidebar functionality
• Connected Calendar navbar button to existing calendar sidebar functionality
• Added support-page navigation routing for Tasks and Calendar views using URL query parameters
• Reused existing sidebar event handlers to avoid duplicated logic
• Verified Settings and Logout button functionality

Testing

• Tested all navbar buttons locally
• Verified sidebar active state updates correctly
• Checked repeated navigation behavior
• Confirmed support-page navigation works properly
• Verified no console errors during navigation

Closes #846

Brief explanation of the contribution.

Changes Made

• Bullet list of implemented changes.
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Testing

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Screenshots

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Checklist

• Code follows project style
• Tested locally
• No unrelated changes included
• Documentation updated (if applicable)