feat: add back to top button

[krishnendu07-code]

Fixes Issue #101

Description

Added a floating Back-to-Top button to improve page navigation.

Changes Made

• Added reusable BackToTopButton component
• Button appears after scrolling down
• Smoothly scrolls back to top when clicked
• Styled to match the existing FreshScan AI theme
• Added accessible aria-label

Testing

• npm run lint
• npm run build

Summary by CodeRabbit

• New Features
  • Added a back-to-top button that appears when scrolling down the page, enabling users to quickly return to the top with a smooth scroll animation.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 9da5569a-4b98-41b2-9d64-8925c313e0b5

📥 Commits

Reviewing files that changed from the base of the PR and between b0ec45a and 35560d2.

📒 Files selected for processing (1)

• src/components/BackToTopButton.tsx

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💥 Parsing errors (1)

Validation error: Invalid input: expected object, received boolean at "reviews.auto_review"

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📝 Walkthrough

Walkthrough

This PR introduces a BackToTopButton component that appears when users scroll past 300 pixels, allowing them to smoothly return to the top of the page. The component is integrated into the main App layout, and import statements are reorganized to reflect the new routing and component usage.

Changes

Back to Top Button

Layer / File(s)	Summary
BackToTopButton component src/components/BackToTopButton.tsx	New fixed-position button component that uses scroll event listener to toggle visibility when scrollY > 300, smoothly animates to top on click, includes ArrowUp icon and accessibility label.
App integration src/App.tsx	Imports BackToTopButton and renders it alongside existing UI components; imports reorganized to align with routing dependencies; minor formatting adjustments to blank lines and braces.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🐰 A button hops into view,
When scrolling grows too weighty,
One click, one smooth flow—
Back to the top, oh so neatly!
✨🔝

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: add back to top button' clearly and concisely summarizes the main change—introducing a new BackToTopButton component that is integrated into the App router layout.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/components/BackToTopButton.tsx`:
- Around line 26-34: The BackToTopButton component currently only hides visually
but remains keyboard-focusable; update the button element in BackToTopButton so
when isVisible is false it is removed from tab order and inert: add disabled={
!isVisible }, aria-hidden={ !isVisible } and tabIndex={ isVisible ? 0 : -1 }
(and keep or remove the visual "pointer-events-none" class as you prefer); also
ensure scrollToTop is a no-op when disabled (or rely on disabled preventing
clicks) so the hidden button cannot be activated via keyboard or mouse.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1cce4a99-8539-423c-be74-c2c50df92668

📥 Commits

Reviewing files that changed from the base of the PR and between b748bcf and b0ec45a.

📒 Files selected for processing (2)

• src/App.tsx
• src/components/BackToTopButton.tsx

[krishnendu07-code]

@jpdevhub I've resolved the conflicts from Code rabbit, also it would be great if add the Ssoc'26 label on the issue.

[krishnendu07-code]

@jpdevhub can you please review my PR.