Add feedback popover with comment for AI responses

[MrOrz]

Adds a Shadcn UI Popover and Checkbox to the FeedbackButtons component. This allows users to provide additional comment alongside their thumbs-up/down score, using a list of predefined reasons and a custom text area. Also handles clearing the feedback if the user clicks the same button again.

Feedback options

thumbs up
語氣適合、篇幅適中、出處精準、具有說服力

thumbs down
篇幅過長、篇幅過短、沒抓到重點、出處不足、回應文字與出處不符、提供不存在的出處、出處摘要錯誤

Cap.2026-05-03.at.03.00.06.mp4

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[gemini-code-assist]

Code Review

This pull request introduces new UI components for Checkbox and Popover using @base-ui/react primitives. Feedback focuses on improving the robustness and usability of these components, specifically by ensuring the Checkbox maintains a visible error state when checked, adding React.forwardRef to PopoverContent for better DOM access, and expanding the PopoverContent props to support more advanced positioning features.

[claude]

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