Save claim was silently failing — button click did nothing. Cause:
\`envelope\` lives in \$state, which wraps the value in a deep Proxy;
idb-keyval calls structuredClone internally, which can't clone proxies
and throws DataCloneError. Without a try/catch the error vanished into
the console and the step transition never ran.
- Pass \$state.snapshot(envelope) to addClaim so IDB sees a plain object.
- Wrap in try/catch + alert so future IDB failures surface to the user
instead of dying silently.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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