Show copy action on assistant messages

[Amer-alsayed]

What Changed

Shows the existing message copy button on assistant messages when their footer is hovered or focused. This is limited to the assistant message footer in ChatView and reuses the existing MessageCopyButton.

Why

User messages already expose a hover copy affordance, but assistant messages require manual text selection or code-block-level copy actions. This keeps the interaction consistent without changing message content, layout structure, or chat behavior.

UI Changes

Before:

After:

Validation

• bun run --filter=@t3tools/web typecheck
• bun run --filter=@t3tools/web test

Scope

• Single file change
• No new settings
• No backend changes

Note

Show copy button on assistant messages on hover

Adds a MessageCopyButton to assistant message rows in ChatView.tsx. The button appears in a control area that fades in on hover or focus, and is only rendered when message text is present. The timestamp moves into a flex container alongside this control area.

^{Macroscope summarized 99a215b.}

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