v0.0.42: markdown rendering in TUI messages

- **bold**, *italic*, \`code\` rendered with ratatui styles
- # headers, > blockquotes, - bullet lists
- Multi-line messages split and indented per line
- Code spans: cyan bold, headers: white bold, quotes: gray italic
- No external dependency (custom md_to_spans parser)
- tui-markdown had ratatui version mismatch, built our own

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

warzone/crates/warzone-server/src/routes/web.rs

@@ -50,7 +50,7 @@ async fn pwa_manifest() -> impl IntoResponse {
 
 async fn service_worker() -> impl IntoResponse {
     ([(header::CONTENT_TYPE, "application/javascript")], r##"
-const CACHE = 'wz-v23';
+const CACHE = 'wz-v24';
 const SHELL = ['/', '/wasm/warzone_wasm.js', '/wasm/warzone_wasm_bg.wasm', '/icon.svg', '/manifest.json'];
 
 self.addEventListener('install', e => {
@@ -287,7 +287,7 @@ let pollTimer = null;
 let ws = null;  // WebSocket connection
 let wasmReady = false;
 
-const VERSION = '0.0.41';
+const VERSION = '0.0.42';
 let DEBUG = true;  // toggle with /debug command
 
 // ── Receipt tracking ──