fix: scope faucet pending state per token

[9904099]

Summary

• Split faucet claim pending state into per-token pending state and separate bulk pending state.
• Show the Claiming... spinner only on the individual token card that is currently claiming.
• Keep the bulk Claim Test Tokens button pending state independent from individual card claims.
• Guard against rapid double-submits by tracking pending tokens synchronously while React state updates.

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

Note: full bun run --filter web typecheck currently reports pre-existing unrelated errors outside the faucet files.

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