* fix(ai): add quick proposal confirmation buttons (all locales)
When the assistant proposes an action, render Yes/No buttons below the
message so the user does not need to type a short reply — fixing the
issue where short replies caused the LLM to re-ask instead of executing.
- aiProposalDetect.ts: pure detectors for proposal sentences/short replies
- AiAssistant.vue: inline Yes/No buttons on last assistant proposal message
- ai.ts: system-prompt rule to skip re-confirmation on short affirmatives
- i18n: 3 keys added to all 7 locales (en/zh-CN/zh-TW/ja/es/it/pt-BR)
Tests: 55/55. TypeCheck: passed.
* fix(ai): add i18n keys and UI changes for proposal confirmation
Abeautifulsnow
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