Add copy-to-clipboard action for proposed plan card

[juliusmarminge]

What Changed

• Added a Copy to clipboard action to the proposed plan card overflow menu in chat.
• Reused the existing clipboard hook so the action supports temporary Copied! label state.
• Added error toast handling when clipboard copy is unavailable/fails.

Why

Users in plan mode need a fast way to copy plan markdown into external tools (for example, Linear) without downloading a file first.

UI Changes

• Added a new menu item (Copy to clipboard) in the plan card actions menu.
• Menu now offers Copy to clipboard, Download as markdown, and Save to workspace.

plan_card_copy_to_clipboard_demo_small.mp4
Plan card actions menu with copy option
Copied markdown pasted into composer

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Add copy-to-clipboard menu action to the proposed plan card

Adds a 'Copy to clipboard' menu item to ProposedPlanCard that copies the plan markdown to the clipboard. The button label changes to 'Copied!' on success, and an error toast is shown via toastManager if copying fails.

^{Macroscope summarized 36fdd4c.}

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