Fix : scroll-to-top button

[Vrutik-0]

Summary [required]

This PR Fix the Scroll-To-Top btn on homepage functionallity of the icon correctly reflects direction

Related Issue [required]

This PR solve the issue #1924

Type of Change [required]

• [✔️] Bug fix — resolves a broken behaviour

What Was Changed [required]

File	Change made
partials/scroll_top_btn.html	Add id="scroll-btn-icon" to the <svg>

How to Test This PR [required]

1. Clone this branch: git checkout your-branch-name
2. Install dependencies: pip install -r requirements.txt
3. Run the app: python app.py
4. Open http://127.0.0.1:5000 and...
5. Run the tests: python tests/test_basic.py

Expected test output:

27 passed, 0 failed out of 27 tests

Test Results [required]

97 passed, 0 failed out of 97 tests

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

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[Vrutik-0]

Requesting Review