chore: bump version to 0.4.2-beta.1 and improve chat UX (#122)

* chore: bump version to 0.4.2-beta.1 and improve chat UX

- Bump version to 0.4.2-beta.1
- Fix live monitor session selected style to match chat session style
- Add thin scrollbar with stable gutter to live monitor sidebar
- Fix live monitor detail scroll on mobile
- Show new chat button as icon-only on mobile using JS detection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: fix version to 0.4.2

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hermes-web-ui",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "Web dashboard for Hermes Agent — multi-platform AI chat, session management, scheduled jobs, usage analytics & channel configuration (Telegram, Discord, Slack, WhatsApp)",
   "repository": {
     "type": "git",