v0.0.30: markdown rendering in web, fix scrolling

Web:
- Markdown renderer: **bold**, *italic*, `code`, ```code blocks```,
  # headers, [links](url), > blockquotes, - lists
- All message text rendered as markdown (bot messages look great now)
- Fixed scroll: overflow-y: scroll + min-height: 0 on messages container
- CSS for code blocks, pre, headers, blockquotes, lists
- Styled: code=cyan bg, pre=dark bg+border, bold=white, italic=amber

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/Cargo.toml

@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.0.29"
+version = "0.0.30"
 edition = "2021"
 license = "MIT"
 rust-version = "1.75"