fix(ui): remove redundant copy button from TextPartDisplay

[haliliceylan]

Context

fixes #445

The TextPartDisplay component in packages/ui/src/components/message-part.tsx had a copy button that copied the entire part.text content (raw markdown source). This was redundant and confusing because the Markdown component already provides copy buttons for individual code blocks.

Users clicking "copy" near a code block would sometimes get the raw markdown source (including extra text, formatting markers) instead of just the code content, depending on which copy button they clicked.

flowchart LR
    subgraph UI["packages/ui"]
        MP[message-part.tsx]
        MP -->|PART_MAPPING.text| TPD[TextPartDisplay]
        TPD -->|contains| MD[Markdown]
        TPD -->|contains| CPY[Copy Button]
    end
    
    style CPY fill:#ff6b6b,color:white

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Implementation

Removed the redundant copy functionality from TextPartDisplay

Screenshots

before	after

How to Test

from original issue

Ask it to generate the bash or command for you to run. Then try to use the copy button.

Get in Touch

https://discord.com/channels/1349288496988160052/1391109167275577464/1473821631267995872

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[kiloconnect]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Clean removal of the redundant copy button from TextPartDisplay. The Markdown component already provides per-code-block copy buttons, making this text-part-level copy unnecessary.

What was verified:

• All removed CSS selectors (text-part-body, text-part-copy-wrapper) were only used in the two modified files — no orphaned references remain
• Removed hooks/signals (useI18n, createSignal, Tooltip, IconButton) are still used by other functions in the same file — no unused imports introduced
• The simplified JSX structure is correct and maintains the existing data-component="text-part" wrapper
• No security, logic, or runtime issues found

Files Reviewed (2 files)

• packages/ui/src/components/message-part.css - Removed 18 lines of CSS for copy button positioning/hover
• packages/ui/src/components/message-part.tsx - Removed copy button logic and simplified TextPartDisplay render