[VS Code extension] Option to collapse/hide tool-use cards and their output in the chat feed

### Preflight Checklist

- [x] I have searched [existing requests](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20label%3Aenhancement) and this feature hasn't been requested yet
- [x] This is a single feature request (not multiple features)

### Problem Statement

### Problem
I use Claude Code inside the VS Code extension (v2.1.220), not the terminal.
I am not a developer — I use it to run my business, not to read code.

The chat feed is dominated by tool-use cards (Read / Bash / Edit) and their
raw output (git logs, file contents, config dumps). For me this is pure noise:
I only want to read Claude's conclusions, not the mechanics of how it got there.

`"verbose": false` in settings.json does not affect these cards in the
extension — they are always shown and expanded.

### Proposed Solution

### Request
A way to collapse or hide tool-use cards and their output by default in the
VS Code extension. Ideally:
- An extension setting (e.g. "Collapse tool output by default" / "Hide tool cards").
- And/or a per-message toggle to expand a card only when I want to inspect it.

### Alternative Solutions

### Why it matters
Non-technical users (business owners, writers, analysts) increasingly use
Claude Code as an assistant. A clean, conclusions-only feed would make it far
more usable for this audience without removing any capability for developers.

Environment: Claude Code VS Code extension, v2.1.220, Windows 11.

### Priority

Medium - Would be very helpful

### Feature Category

Performance and speed

### Use Case Example

_No response_

### Additional Context

_No response_

Start by reproducing the VS Code extension chat feed with tool-use cards and checking how extension settings are defined and applied. Review the existing chat UI and settings entry points; done means tool cards or their output can be collapsed or hidden by default while remaining available through an explicit toggle.

Written by the indexing model from the issue text.