fix(content-translator): translate hasMany text fields per entry

[jhb-dev]

What

hasMany text fields (e.g. keyword/tag lists) store an array of strings. The traversal previously pushed the whole array as a single value to translate, so the resolver received a non-string entry — at best the array got clobbered into one string, at worst it crashed in he.decode(...) with "e.replace is not a function".

Now each element is translated individually. The target is pre-seeded with the originals and each entry is replaced in place as its translation resolves, so a skipped or non-string element keeps its original text.

Tests

test/traverseFields.test.ts:

• translates each element of a hasMany text field individually;
• keeps non-string entries in place while translating the rest;
• does not send the whole array as a single value.

Dev app

Added a localized hasMany keywords field to the dev pages collection (seeded with sample values) so the behavior is clickable in the admin panel.

Notes

Split out from a combined branch; the rich-text marker / index-reconstruction fixes ship separately in #166. Builds on the unnamed-group fix already on main.

🤖 Generated with Claude Code

https://claude.ai/code/session_01L4xMrsaXkGmviWmb8MK1hb

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Generated by Claude Code

[jhb-dev]

The CodeQL "prototype-polluting assignment" alert on traverseFields.ts:351 (siblingDataTranslated[field.name] = translatedArray) is a false positive. field.name is validated before the switch runs — the loop continues on any field named __proto__/constructor/prototype via the isUnsafeKey guard:

if ('name' in field && isUnsafeKey(field.name)) {
  continue
}

So line 351 is unreachable for a polluting key. This is the same guarded pattern every other siblingDataTranslated[field.name] = … write in the file relies on (including the unchanged string-value write just below it); CodeQL only flagged this line because it's newly added and assigns an array. The guard is covered by the existing traverseFields - prototype pollution tests ("ignores a field named __proto__/constructor/prototype").

Suggest dismissing alert #19 as a false positive — no code change needed.

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Generated by Claude Code