style: add active navigation state indicator

[bhatiakavisha]

Description

Implemented dynamic active navigation state indicators across the application navbar using Jinja request.path checks.

Changes Made

• Replaced hardcoded active navigation styling in compare.html.
• Added dynamic active state support for navigation links in contact.html.
• Added active state support for mobile navigation links in index.html.
• Reused the existing .active styles and underline animations already defined in the project.
• Ensured active indicators update automatically based on the current route.

Testing

• Verified active navigation states on:

  • Home page
  • Compare page
  • Contact page

• Tested desktop and mobile navigation menus.

• Ran test suite successfully.

Issue

Closes #751

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