feat: add Behavior settings page for global AGENTS.md (#1079)
* feat: add Behavior settings page for global AGENTS.md
- Add new 'Behavior' settings page to manage global system prompt
- Sync global behavior prompt to ~/.config/opencode/AGENTS.md
- Add GET/PUT /api/behavior/agents-md endpoints with 1MB size limit
- Add AbortController guards and parallel fetches in BehaviorPage
- Add i18n translations for en, es, ko, pt-BR, uk, zh-CN
- Add globalBehaviorPrompt to DesktopSettings type and sanitizer
- Add /api/behavior to express.json() body-parser whitelist
- Ensure atomic save: AGENTS.md written before settings updated
* fix: address Greptile review feedback
- Rename misleading 'trimmed' variable to 'value' in settings-helpers.js
- Add Content-Length guard for /api/behavior before 50mb JSON parser
- Use express.json({ limit: '1mb' }) for behavior endpoints
- Add actual translations for es, ko, pt-BR, uk, zh-CN locales
* fix(vscode): support behavior settings endpoint
* fix(behavior): wait for settings persistence
* fix(behavior): end agents file with newline
* fix(behavior): avoid duplicate textarea resize handles
* fix(behavior): clarify global rules copy
* fix(behavior): move rules note into tooltip
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Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>
