feat: Referrals embed

[nizzyabi]

What does this PR do?

• Created a clean /refer page with proper loading states and dub embed
• Set up the API endpoint to generate user-specific referral tokens
• Implemented theme support so it looks good in both light/dark modes
• This PR adds the ability for users to earn affiliate commissions through a Dub-powered referral system.

Demo

https://www.loom.com/share/86aadaaf8fef486387fde9ebfae73305

Mandatory Tasks (DO NOT REMOVE)

• [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
• [x] I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• [x] I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

• Go to /refer (bottom of sidebar)
• See Dub.co embed pop up
• Have a shareable affiliate link

[github-actions[bot]]

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[graphite-app[bot]]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (03/04/25)

1 reviewer was added to this PR based on Keith Williams's automation.

"Add foundation team as reviewer" took an action on this PR • (03/04/25)

1 reviewer was added to this PR based on Keith Williams's automation.

"Add community label" took an action on this PR • (03/20/25)

1 label was added to this PR based on Keith Williams's automation.

[socket-security[bot]]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/[email protected]	None	0	5.65 kB	goto-bus-stop

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[socket-security[bot]]

👍 Dependency issues cleared. Learn more about Socket for GitHub ↗︎

This PR previously contained dependency changes with security issues that have been resolved, removed, or ignored.

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[github-actions[bot]]

E2E results are ready!

• Workflow #52809.1 latest results

[Amit91848]

yarn.lock is messed up. Created a new PR #20258