[QOL FEATURE] chat:copy* keybinding actions for response copying

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

/copy exists and works great, but there's no corresponding keybinding action to map it to a shortcut in keybindings.json. Typing /copy and interacting with the picker each time breaks flow during rapid iteration — especially when you're copying Claude's output into other files or terminals dozens of times per session.

Proposed Solution

A family of copy-related keybinding actions in the Chat context:

• chat:copyResponse — Copies the full last assistant response (equivalent to /copy with "Always copy full response" enabled)
• chat:copyCodeBlock — Opens the interactive code block picker (current /copy behavior)
• chat:copyLastCodeBlock — Copies the most recent code block directly. No picker, no interaction. This is the 90% case.
• chat:copyTurn — Opens a turn selector to copy from any assistant message in the conversation, not just the last one. Useful in long sessions where the good output was several turns back.

Example keybindings.json:

{
"context": "Chat",
"bindings": {
"ctrl+shift+c": "chat:copyResponse",
"ctrl+shift+x": "chat:copyLastCodeBlock",
"ctrl+shift+a": "chat:copyTurn"
}
}

Alternative Solutions

• Using Zed's integrated terminal select + copy (Cmd+C), but this requires manual mouse selection and doesn't understand code block boundaries, you end up grabbing line numbers, prompt artifacts, or partial blocks.
• External clipboard managers (Raycast, Alfred) can capture everything you copy sure, but has no awareness of Claude Code context. No tagging, no fuzzy search scoped to prompts, no $1/$2 interpolation, no project-level sharing via git. Also doesn't integrate with Zed's terminal workflow.
• Manually maintaining a prompts.md file and copy-pasting in/out TECHNICALLY WORKS but it's entirely manual and has no integration with the Claude Code workflow, and no keybind to make it seamless.
• Shell history (up arrow) only works within the same session, doesn't persist, and mixes prompts with every other command.

Priority

High - Significant impact on productivity

Feature Category

Interactive mode (TUI)

Use Case Example

You're iterating on a module. Claude outputs a corrected function. You want to paste it into your editor. Right now: type /copy, interact with picker, select the block, paste. With chat:copyLastCodeBlock bound to ctrl+shift+x: one keystroke, it's on your clipboard.

For chat:copyTurn? You're 12 turns deep, and the best version of a component was 5 turns ago. Currently you scroll, manually select, copy. With chat:copyTurn you get a turn picker and grab it instantly BOOM BAM BOP 100x PRODUCTIVITY GAINED.

Additional Context

Also proposing a copyFormat setting in settings.json — "raw" or "markdown". When pasting into terminals, Slack, or non-markdown contexts, you don't want backticks, headers, and bold markers coming along. Raw mode strips all markdown formatting before copying to clipboard.