fix: polish Cloudflare approval trace demo

[creatornader]

Summary

• refine the Cloudflare approval trace demo UI and state machine
• align approve, reject, and request-change paths across progress, trace, signers, and receipt panels
• update the Worker proof runner for the current trigger to triage to proposal trace shape

Validation

• pnpm --filter @atrib/cloudflare-approval-trace build
• pnpm --filter @atrib/cloudflare-approval-trace test
• pnpm --filter @atrib/cloudflare-approval-trace test:browser
• pnpm --filter @atrib/cloudflare-approval-trace proof:worker, 169/169 checks against https://atrib-cloudflare.nagala.workers.dev