style: improve navbar hover underline animation

[pari-dubey1]

Summary [required]

Added a smoother and more modern animated underline hover effect for navbar links to improve visual feedback and overall navigation interactivity.

The underline animation now expands from the center with a 75% width effect, creating a cleaner and more polished UI experience.

Also fixed the mobile hamburger menu visibility issue caused during styling updates.

---

Related Issue [required]

Closes #215

---

Type of Change [required]

• Bug fix — resolves a broken behaviour
• Feature — adds new functionality
• Data — adds new projects to data/projects.json
• Documentation — updates docs, README, or code comments only
• Style — CSS or visual changes only, no logic change
• Refactor — restructures code without changing behaviour
• Test — adds or updates tests

---

What Was Changed [required]

File	Change made
static/style.css	Improved navbar underline hover animation, fixed double underline issue, added centered animation effect, and restored mobile hamburger menu visibility

---

How to Test This PR [required]

1. Clone this branch:
   git checkout style/navbar-hover-underline

2. Install dependencies:
   pip install -r requirements.txt

3. Run the app:
   python app.py

4. Open:
   http://127.0.0.1:5000

5. Hover over navbar links and verify:

   • Underline animates smoothly
   • Underline expands from center
   • Underline width remains around 75%
   • No permanent underline remains after hover
   • Mobile hamburger icon is visible

6. Run the tests:
   python tests/test_basic.py

Expected output:

27 passed, 0 failed out of 27 tests

---

Test Results [required]

27 passed, 0 failed out of 27 tests

---

Screenshots (if UI change)

Before:

After:

---

Self-Review Checklist [required]

• I have read CONTRIBUTING.md and followed all guidelines
• My branch name follows the convention: feat/, fix/, docs/, data/, style/, test/
• I have run python tests/test_basic.py and all 27 tests pass
• I have run flake8 . locally and there are no errors
• I have not introduced any print() or console.log() debug statements
• Every new function I wrote has a docstring
• I have not modified files outside the scope of the linked issue
• If I changed the UI, I tested it at 375px (mobile) and 1280px (desktop)
• If I added a project to the dataset, it has all required JSON fields

---

Notes for Reviewer

This PR only updates navbar styling and hover interactions. No application logic or backend functionality was modified.

[vercel]

@pari-dubey1 is attempting to deploy a commit to the komalsony234-1530's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

Thank you for submitting your first pull request to DevPath.

Before review:

• Complete the PR template fully
• Ensure all tests pass
• Link your PR to an issue
• Keep changes scoped to the issue

A maintainer will review your contribution soon.

[pari-dubey1]

@komalharshita Hi! I’ve completed the changes in this PR. Everything has been tested locally and is working properly now.

Could you please review and merge this PR into the main branch when you get a chance? Thank you!

[komalharshita]

Well-scoped and clean UI enhancement. The updated navbar hover animation feels smoother and more polished, and the mobile hamburger visibility fix is a good addition.

The PR keeps changes limited to relevant styling updates without introducing unnecessary modifications. The centered underline animation implementation is handled well.

Approved for merge.

[komalharshita]

@pari-dubey1 but first ensure that all checks pass

[pari-dubey1]

@komalharshita I checked the failing CI logs, and the failure seems unrelated to the navbar styling changes in this PR.

The failing test is:

FAIL test_health_check: test_health_check() missing 1 required positional argument: 'client'

All other tests are passing successfully, so it appears to be an existing test/configuration issue rather than something introduced by this PR.

[komalharshita]

@pari-dubey1 sync your branch with the latest main