fix: coerce non-string da-metadata values to avoid "[object Object]"

[chrischrischris]

Summary

• setDaMetadata is the single boundary into the daMetadata Y.Map, but it forwarded values verbatim. doc2aem later interpolates each value into <div>${value}</div>, so any non-string entry (object, Y type) ends up serialized as the literal string [object Object] in saved HTML — observed in the wild as:

  <div class="da-metadata"><div><div>acceptedhashes</div><div>[object Object]</div></div><div><div>rejectedhashes</div><div>[object Object]</div></div></div>

• Coerce at the boundary: stringify objects via JSON.stringify, other non-strings via String(), and console.warn so the offending caller is visible in dev tools next time it happens.
• Added two unit tests covering object and primitive coercion.

Notes for reviewers

• I couldn't pinpoint which call site is producing non-string values. Every in-tree caller (addToHashMetadata and the version-restore loop in da-editor.js) already passes strings, and the lowercase keys (acceptedhashes/rejectedhashes) in the observed HTML don't match our ACCEPTED_KEY/REJECTED_KEY constants (acceptedHashes/rejectedHashes) — so the corrupt entries likely came from outside setDaMetadata entirely. The new console.warn should help surface the source.
• A companion defensive fix is also worth doing in da-parser's doc2aem (parser.js:753), which neither stringifies nor HTML-escapes the keys/values. Happy to put up a PR there as a follow-up.

Test plan

• npx web-test-runner test/unit/blocks/edit/utils/helpers.test.js — 64 passing, including new coercion tests.
• Reproduce the original symptom (a corrupted doc with [object Object] in da-metadata), open it in da-live, edit, save, and confirm no new [object Object] rows are written.

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• 8dabbba ✅ (latest)