[rozemary2026-a11y]

Summary

The image gallery (ImageGallery / ImageLightbox) rendered hard-coded English strings and trusted the image list it received from the API. A broken address became a broken image, a duplicated address was rendered twice, and the gallery was the only part of the property page that ignored the language the user picked.

This PR translates the gallery and validates the image list before anything is rendered.

Closes #1264
Closes #1265

Changes

Translations (#1264)

• Every string of ImageGallery and ImageLightbox now comes from the gallery section of the common namespace: the empty state, the overlay on the main image, the alternative text of the images and of the lightbox thumbnails, the lightbox controls and the position indicator.
• The gallery section is shipped in all seven languages the app supports (en, es, fr, de, zh, ar, he), so the translation completeness test keeps them in sync.
• Counted strings use the i18next plural form (viewAll / viewAll_one). The base key is kept as well, so languages with more plural categories than English (Arabic, Hebrew) resolve to a sentence instead of a raw key.
• The alternative text of the images falls back to a generic, translated label when the property has no name, so an image never ends up without an alternative text.

Validation (#1265)

The image list is validated with a zod schema (galleryImageSchema) before it is rendered. The rules are the ones the renderer can actually honour:

Rule	What happens
The entry is text	The entry is skipped and reported
The entry is not empty once trimmed	The entry is skipped and reported
The entry is an http(s) URL or a path that starts with /	The entry is skipped and reported
The address was already used	The entry is skipped and reported
The gallery is longer than GALLERY_MAX_IMAGES (50)	The extra images are not rendered and counted

next/image only accepts an absolute http(s) URL or a path that starts with a slash, so a relative path without the leading slash and a data: URL are rejected before they can turn into a broken image.

Every rejected entry is reported to the user in a role="status" notice above the gallery, with the reason it was skipped. A gallery whose images are all invalid shows that notice and the empty state.

The lightbox index is clamped to the image list, so it can never point at an image that does not exist.

Tests

• src/lib/__tests__/galleryValidation.test.ts — the validation rules themselves.
• src/components/property/__tests__/ImageGallery.validation.test.tsx — which images are rendered, which are skipped and what the user is told about it.
• src/components/property/__tests__/ImageGallery.i18n.test.tsx — the translated strings, the plural forms, the language switch and the key parity between the languages.
• src/test/i18n.ts — a test helper that boots i18next with the real translations, so the tests assert the strings the app renders instead of the raw keys.
• src/components/property/__tests__/ImageGallery.test.tsx — the existing suite, now rendering the translated strings.

Documentation

• docs/gallery.md describes the validation rules, the translation keys and the tests, and is linked from the README.

How it was verified

npx jest src/components/property/__tests__ src/lib/__tests__/galleryValidation.test.ts
npm run typecheck
npx eslint src/lib/galleryValidation.ts src/test/i18n.ts src/components/property

The gallery suites pass, and the type check and the lint report exactly the same findings as the base commit — this change adds none.

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[nanaf6203-bit]

Gallery i18n plus image list validation, solid combo. Approved.