fix: scope faucet claim state per token

[Chenxizhe2025]

Summary

• Track faucet claim lifecycle per token in a single useClaim hook: idle, pending, success, and error.
• Keep single-card claims isolated so only the clicked card shows a spinner, disables, and receives success/error feedback.
• Keep the bulk button state separate: it only shows a spinner for bulk claims, and it is disabled while any faucet token claim is already in flight to avoid duplicate submissions.
• Preserve the existing toast flow, explorer link, cooldown message, and balance invalidation after success.

Closes #175

Validation

• bun install --frozen-lockfile
• bun run lint -- src/features/faucet/hooks/useClaim.tsx src/features/faucet/components/faucet-page.tsx
• bun run build
• bun run typecheck currently fails on pre-existing unrelated errors outside the faucet files: earn discover callback return type, unused mock write/imports, referral nullable arg, wallet AccountBadge null destructure, and shared bignum test assert globals.

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