feat: Add Copy profile url link button

[0411-bokilshruti]

Summary

Added a CopyLinkButton client component that copies the public profile URL to clipboard on click, with a 2-second "✓ Copied!" visual feedback. Button is placed in the profile page header next to the username.

Closes #192

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

Changes Made

• Created src/components/CopyLinkButton.tsx as a 'use client' component.
• Added clipboard copy functionality using navigator.clipboard.writeText(window.location.href).
• Button text changes to ✓ Copied! for 2 seconds after clicking.
• Added aria-label="Copy profile link" for accessibility.
• Imported and placed CopyLinkButton in src/app/u/[username]/page.tsx next to the username.

How to Test

Steps for the reviewer to verify this works:

1. Navigate to any public profile page /u/[username]
2. Click the 🔗 Copy link button
3. Paste anywhere to verify the correct profile URL was copied
4. Verify button shows ✓ Copied! for 2 seconds then resets

Screenshots (if UI change)

Checklist

• Linked issue in summary
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff
• Added/updated tests if applicable

[vercel]

@0411-bokilshruti is attempting to deploy a commit to the PRIYANSHU DOSHI's projects Team on Vercel.

A member of the Team first needs to authorize it.

[Priyanshu-byte-coder]

Two issues:

1. Copies the wrong URL

CopyLinkButton is placed in DashboardHeader.tsx and copies window.location.href — which is the dashboard URL (/dashboard), not the public profile URL. Issue #192 is about the public profile page (/u/username).

Either:

• Move the button to src/app/u/[username]/page.tsx (the public profile page), where window.location.href is already the profile URL, or
• Keep it in the dashboard header but copy ${window.location.origin}/u/${session.githubLogin} using the session login

2. tsconfig.json change already merged

jsx: "react-jsx" → "preserve" was already merged via PR #358. This will cause a merge conflict. Remove the tsconfig change from this PR.

[0411-bokilshruti]

Hey @Priyanshu-byte-coder, I've addressed both the issues. The button now copies the correct public profile URL using session?.githubLogin. Please take a look when you get a chance.

[Priyanshu-byte-coder]

Closing in favor of PR #269 which correctly places the copy link button on the public profile page (/u/[username]). Issue #192 asked for the button on the public profile, not the dashboard header. PR #269 has been merged.