📝 Add docstrings to 03-17-prompt_playground_style_fixes

[coderabbitai]

Docstrings generation was requested by @impoiler.

• refactor: standardize icon sizing to size-3 and refine hover styles in message views #2119 (comment)

The following files were modified:

• ui/components/prompts/components/messagesView/assistantMessageView.tsx
• ui/components/prompts/components/messagesView/attachmentViews.tsx
• ui/components/prompts/components/messagesView/errorMessageView.tsx
• ui/components/prompts/components/messagesView/messageRoleSwitcher.tsx
• ui/components/prompts/components/messagesView/rootMessageView.tsx
• ui/components/prompts/components/messagesView/systemMessageView.tsx
• ui/components/prompts/components/messagesView/toolCallResultView.tsx
• ui/components/prompts/components/messagesView/toolCallView.tsx
• ui/components/prompts/components/messagesView/userMessageView.tsx
• ui/components/prompts/fragments/sidebar.tsx

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✅ impoiler
❌ akshaydeo
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