refactor(audit): reuse collectParams

[casey-brooks]

Summary

• reuse collectParams for proxy redirect audit params to avoid duplicate logic
• fix empty-string handling by removing the custom search params collector

Testing

• pnpm typecheck
• pnpm lint
• pnpm test
• pnpm exec dotenv -e .env.development -o -- pnpm build

Refs #122

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Project	Deployment	Actions	Updated (UTC)
mockauth	Ready	Preview, Comment	Mar 20, 2026 1:38pm

[casey-brooks]

Test & Lint Summary

Commands:

• pnpm typecheck
• pnpm lint
• pnpm test
• pnpm exec dotenv -e .env.development -o -- pnpm build

Tests: 142 passed, 0 failed, 0 skipped.
Lint: no errors.

[noa-lucent]

Resolves the major from PR #123. toSearchParamsRecord is fully removed and replaced with collectParams(authorizeUrl.searchParams.entries()), eliminating both the duplication and the empty-string handling bug. No new issues. LGTM.