fix(ws): reject tokens with NaN timestamps in verifyWsToken

[0x-SquidSol]

Summary

• Issue: parseInt(timestampStr, 10) returns NaN for non-numeric strings. Without a guard, now - NaN > 300000 evaluates to false, allowing the time check to pass. While the subsequent HMAC check still prevents forgery (attacker needs the secret), this is a defense-in-depth gap.
• Fix: Adds Number.isNaN(timestamp) guard immediately after parseInt, rejecting malformed timestamps before reaching the time comparison.

Changes

• src/routes/ws.ts: 1 line added after parseInt — early return on NaN

Test plan

• tsc --noEmit passes
• vitest run passes (186/186 tests)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bd6eae51-3654-49c9-8122-5229150bdf3f

📥 Commits

Reviewing files that changed from the base of the PR and between fb94c29 and 05d72b5.

📒 Files selected for processing (1)

• src/routes/ws.ts

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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