fix: chatbot conversation rename/delete unreachable on mobile (v0.55.1)

Both buttons were opacity-0 group-hover:opacity-100 — no touch equivalent
to :hover, so they never appeared on mobile at all. Made them always
visible, matching the app's existing convention for per-item actions in
narrow lists (e.g. shopping-list-actions-menu.tsx) rather than hover-reveal.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "epicure",
-  "version": "0.55.0",
+  "version": "0.55.1",
   "private": true,
   "scripts": {
     "dev": "pnpm --filter web dev",