[fukalous]

What

• replace runtime composition of translated model-name fragments with two complete fallback messages
• cover both catalog shapes: chat-only and chat-plus-image
• remove the five unused fragment keys and translate the two new sentences in every shipped locale
• remove the resolved Known gap from the localization architecture doc

Why

The Studio fallback inserted independently translated noun phrases into Needs {models}. Languages with case agreement could not translate that sentence correctly because each phrase was translated without its sentence context. studioCatalog() currently produces only two requirement shapes, so two complete messages cover the full fallback surface.

Fixes #1968

How to test

• corepack pnpm exec vitest run --environment jsdom (49 files, 301 tests passed)
• corepack pnpm exec eslint .
• corepack pnpm exec tsc -b
• corepack pnpm run translations:verify
• node scripts/check_translations.mjs
• python scripts/check_docs.py

AI disclosure

This PR was implemented and reviewed by an AI coding assistant. No independent human review is claimed.

High-level PR Summary

This PR fixes a localization issue in the Studio feature where model requirement messages were composed at runtime by joining translated fragments, preventing proper grammatical case agreement in languages like German. The fix replaces five translation keys with two complete sentences covering both requirement shapes (chat-only and chat-plus-image), updates all shipped locale files, adds test coverage for the new fallback messages, and removes the resolved known gap from the localization architecture documentation.

⏱️ Estimated Review Time: 15-30 minutes

💡 Review Order Suggestion

Order	File Path
1	docs/architecture/localization.md
2	surfsense_local/frontend/src/features/studio/studio-panel.tsx
3	surfsense_local/frontend/src/features/studio/studio-panel.test.tsx
4	surfsense_local/frontend/translations/en.json
5	surfsense_local/frontend/translations/de.json
6	surfsense_local/frontend/translations/es.json
7	surfsense_local/frontend/translations/fr.json
8	surfsense_local/frontend/translations/hi.json
9	surfsense_local/frontend/translations/ja.json
10	surfsense_local/frontend/translations/ko.json
11	surfsense_local/frontend/translations/pt-BR.json
12	surfsense_local/frontend/translations/ru.json
13	surfsense_local/frontend/translations/zh-CN.json

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