feat: bug fixes and name added

[parnish007]

feat: add contributor profile card + bug fixes and accessibility improvements

Summary

Adds my contributor profile to the Playground and includes several bug fixes
and accessibility improvements made across the workshop pages.

Profile added

• Name: Trilochan Sharma
• Roll: 37 (CS 1st Year, 2nd Sem)

index.html (reference hub)

• Fix: copy buttons now work when the page is opened via file:// (added a
  clipboard fallback + secure-context check)
• Fix: literal backticks in Step 3 now render as proper code styling
• A11y: aria-labels on copy buttons, focus-visible outlines, smooth-scroll
  with scroll-padding so anchors aren't hidden under the sticky nav

git_github_masterclass_unified.html (slide deck)

• Fix: typo "filw" → "file" and stray space in the EDIT ME tag (slide 17)
• Fix: invalid Tailwind width classes on the Git vs GitHub table
• A11y: aria-labels on nav buttons, live region for slide counter,
  Home/End key support, reduced-motion support, gradient fallback for the
  title-slide background

[netlify]

✅ Deploy Preview for kuosc-git-workshop ready!

Name	Link
🔨 Latest commit	1e74d01
🔍 Latest deploy log	https://app.netlify.com/projects/kuosc-git-workshop/deploys/6a1e90f5072df600078b7cfb
😎 Deploy Preview	https://deploy-preview-43--kuosc-git-workshop.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
🤖 Make changes	Run an agent on this branch

---

To edit notification comments on pull requests, go to your Netlify project configuration.