FE: Builder 'my bounties' activity + rewards receipt

[0xdevcollins]

Context

Part of the Bounty Builder Lifecycle milestone (v1 boundless). The builder needs a place to track their bounty applications/submissions and see reward receipts. Rewards are push-paid on-chain, so this is a receipt/earnings view (no claim step).

Blueprint to mirror

• app/me/participating/page.tsx (active participation + progress)
• app/me/hackathons/submissions/page.tsx (submissions table + detail sheet)
• app/me/earnings/page.tsx (earnings breakdown; already has a bounties field)

Tasks

• /me bounty surfaces: my applications (status: submitted/shortlisted/selected/declined/withdrawn) and my submissions (progress: submitted -> in review -> won/closed), consuming useMyBountyActivity.
• Reward receipt: surface bounty payouts (tier/position, amount, tx hash, paidAt) in /me/earnings (breakdown.bounties) once the backend wires bounty earnings.

Acceptance criteria

• The builder sees their applications, submissions, results, and reward receipts.

Depends on

• Backend participant dashboard queries + earnings wiring; bounty data layer.

[linear]

BOU-275

[coderabbitai]

🔗 Related PRs

#419 - Atlas-Bounty: Implement Private Earnings Dashboard (/me/earnings) [merged]
#426 - feat: implement Public Earnings Section in Profile [merged]
#430 - Submission page [merged]
#576 - fix(rewards): show track winners on the organizer rewards page [merged]
#582 - fix(rewards): match track winners by submissionId, not participantId [merged]

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[Ojas2095]

/claim

I'd like to take this on! Reviewing the repository right now and will submit a PR shortly.