[FEATURE] Plan approval popup UX improvements — copy to clipboard, decline with comments, resizable popup (Claude desktop app)

Context

When Claude Code in GUI calls ExitPlanMode in the Claude desktop app (Code tab, adjacent to Chat/Cowork modes), a plan approval popup appears showing the plan contents with action buttons. While the popup is functional, it has several UX gaps that hurt the review experience.

Feature Requests

1. Copy to Clipboard button

The plan approval popup has no way to copy the plan text. Users must manually select and copy, which is error-prone in the popup's constrained view. A simple "Copy to clipboard" button (or icon) on the popup would make it easy to grab the plan for reference, paste into notes, or share with teammates.

2. Explicit "Decline with comments" option

Currently the popup offers options like "Approve in auto mode", "Approve with manual review", and "Keep planning" — plus a text box at the bottom for editing the response. There is no explicit decline action that lets you reject the plan and steer the agent in a different direction with feedback.

Requested: Add a "Decline" or "Reject" button that, when clicked, opens an inline text field (or reuses the existing response box) where the user can explain why they're declining and what direction they want instead. This is semantically different from "keep planning" (which implies the same direction, just more iteration) and from editing the response box (which feels like tentative acceptance with tweaks).

3. Resizable popup (not just collapsible)

The popup is already collapsible/minimizable, which is good. However, when expanded, it occupies a fixed size that blocks the conversation history behind it. This is a poor experience when you need to scroll back through earlier conversation context to evaluate the plan.

Requested: Allow the popup to be resized (drag to resize) so users can shrink it enough to see and scroll through the conversation behind it, without having to fully collapse and lose sight of the plan.

Environment

• Platform: Claude desktop app (Claude Code tab), version 1.1.9310
• - OS: Windows 11