Quick AI actions on clipboard or selected text. Four actions:
- 翻译 (中/英/日)
- 总结 (3-bullet Chinese)
- 改语气 (正式/口语/友好/严谨)
- 邮件回复
Powered by DeepSeek with Server-Sent Events streaming for
typewriter feedback (~600ms first byte). Two source modes:
clipboard (no permission) and selected-text via NSAccessibility
(graceful fallback to clipboard + permission banner if denied).
Five-state UI machine: idle → input → loading (cancellable) →
result → missing-config. Last 20 actions persisted to UserDefaults.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
