[samjay8]

Summary

#1204 — Seasonal campaign rewards page

• The campaigns page now groups campaigns into Active, Upcoming and Ended sections (GET /campaigns?wallet=).
• Each card shows the key name, reward pool, criteria, a live countdown ("Starts in" for upcoming campaigns), and eligibility status and progress (for example, volume / min_volume).
• On ended campaigns, eligible wallets get a Claim reward button. It submits the claim_campaign_reward contract call (campaign_id, claimant) through the connected signer.
• After a successful claim, a Claimed badge replaces the button. The badge appears immediately, then a refetch confirms it.
• An empty state is shown when no campaigns exist.

#1208 — Reserve balance indicator on key detail

• Adds a Reserve Balance chip to the key detail stats row. It is fed by GET /keys/:key_id/reserve and refetched on every page load.
• A tooltip explains the reserve's role as a price stability backstop.
• A Low reserve warning appears when the reserve is below 10% of market cap.
• The chip is hidden for keys with no reserve accrued.

Testing

• New tests: CampaignsPage.test.tsx, ReserveBalanceChip.test.tsx and keyReserve.utils.test.ts, plus lifecycle cases in campaign.utils.test.ts. The existing CampaignsSection tests still pass.
• pnpm lint and pnpm build pass.

Closes #1204
Closes #1208

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