feat: add back to dashboard link on public profile

[Mash4-4-4-4]

Summary

Added a conditional “← Back to dashboard” link on public profile pages for profile owners.

Closes #211

Type of Change

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

Changes Made

• Created a BackToDashboard client component
• Used useSession() to detect the logged-in user
• Compared session username with the [username] route param
• Rendered the dashboard navigation link only when the viewer is the profile owner
• Added muted foreground hover styling matching the existing UI theme

How to Test

Steps for the reviewer to verify this works:

1. Log into the application
2. Open your own public profile route: /u/[your-username]
3. Verify that the “← Back to dashboard” link appears at the top
4. Click the link and confirm it navigates to /dashboard
5. Open another user's public profile
6. Verify that the link does not appear

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

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[Priyanshu-byte-coder]

Component logic is right (only show link when viewer = owner) but wrong session field used for comparison:

// ❌ session.user.name is the GitHub display name ('John Doe'), not the login
const isOwner = currentUser === username; // where currentUser = session?.user?.name

// ✅ githubLogin is the actual GitHub username used in the URL
import { useSession } from 'next-auth/react';
const { data: session } = useSession();
const isOwner = session?.githubLogin === username;

If the user's display name differs from their login (e.g. name='Priyanshu Doshi', login='Priyanshu-byte-coder'), the back button never shows. One-line fix.

[Priyanshu-byte-coder]

One bug to fix — the ownership check uses the wrong session field:

// Replace:
const currentUser = session?.user?.name;
// With:
const currentUser = session?.githubLogin;

session.user.name is the display name (e.g. "John Doe"), not the GitHub login (e.g. "johndoe"). The public profile URL uses the GitHub login, so the comparison will always fail.

Fix and push — everything else looks good.