[FEATURE] VS Code Extension: Chat input doesn't auto-format Markdown lists while typing (e.g. "- " → bullet)

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

In Claude Desktop's Code tab, typing - at the start of a line in the message composer automatically converts it into a live bullet point, and pressing Enter continues the list — a lightweight live-markdown editing behavior common to Notion/Slack-style editors.

The Claude Code VS Code extension's chat input does not do this: typing - just leaves two literal characters in what appears to be a plain textarea, with no live list formatting and no auto-continuation on Enter.

This makes multi-item messages (e.g. listing several requirements, file paths, or options) noticeably more tedious to compose in the VS Code extension than in Desktop, since there's no visual feedback that a list is forming until after the message is sent and rendered.

Proposed Solution

Add lightweight live-markdown formatting to the chat input box, starting with auto-list behavior: typing - (or 1. ) at the start of a line converts it into a bullet/numbered list item, and pressing Enter continues the list — matching Claude Desktop's own input behavior.

Alternative Solutions

Currently, composing a list requires typing each - manually with no visual confirmation or auto-continuation, and no setting exists to enable this.

Priority

Low - Nice to have

Feature Category

Configuration and settings

Use Case Example

1. I'm composing a multi-item message in the Claude Code VS Code extension's chat input — e.g. listing three separate requirements.
2. In Claude Desktop, typing - then my first item, then Enter, already shows a bullet and continues the list for my second item.
3. In the VS Code extension, nothing happens — - is just two literal characters, and Enter starts a plain new line with no list formatting at all.
4. With this feature, the input box would visually format the list as I type it, matching the Desktop experience.

Additional Context

Noticed while comparing VS Code extension chat input behavior against Claude Desktop's Code tab, which already supports this.