floating auto scroll up button added

[MohanPrasathSece]

This PR adds a global, accessible Scroll‑to‑Top button to improve navigation on long pages. The button appears after the user scrolls down 300px and provides a smooth scroll back to the top, enhancing overall UX and reducing friction in deep content sections. It is rendered site‑wide via
app/layout.tsx
, respects dark mode, and includes keyboard‑focus styles and an aria-label for accessibility. Positioning has been tuned (bottom-8 right-10 md:right-12) so it remains visible across screen sizes and avoids overlapping UI. Implemented in
components/ScrollToTop.tsx
and imported in
app/layout.tsx
.

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[MohanPrasathSece]

Added
components/ScrollToTop.tsx
and wired it globally in
app/layout.tsx
.
Appears after 300px scroll; smooth scroll to top on click.
Accessible: aria-label, focus-visible ring, pointer cursor.
Position adjusted for better visibility (bottom-8 right-10 md:right-12).

[eeshm]

Will check the pr soon and get back to you.