fix(mobile): improve mobile UI for kanban, group chat and page headers (#562)

- Fix kanban loading spinner flickering on auto-refresh (silent mode)
- Fix group chat room-list transparent background on mobile
- Fix group chat sidebar auto-opening on mobile entry
- Fix page-header title overlapped by hamburger button on mobile
- Move hamburger button position to top: 10px
- Add changelog note about upgrading hermes-agent for kanban support
- Add i18n translations for all 8 locales

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/client/src/styles/global.scss

@@ -114,7 +114,7 @@ a {
 .hamburger-btn {
   display: none;
   position: fixed;
-  top: 16px;
+  top: 10px;
   left: 12px;
   z-index: 99;
   width: 36px;
@@ -139,7 +139,7 @@ a {
   }
 
   .page-header {
-    padding: 16px 12px 16px 52px;
+    padding: 16px 12px 16px 52px !important;
   }
 
   .input-sm,