v0.3.4 style fixes

frontend/src/index.css

@@ -379,3 +379,15 @@ a { color: inherit; text-decoration: none; }
 [data-theme="dark"] .msg-input-raw {
   caret-color: var(--text-primary);
 }
+
+/* Night mode: .in bubble (dark surface) — base mention colour is too dark, use light primary */
+[data-theme="dark"] .in .mention {
+  color: #6ab0f5;
+  background: rgba(106,176,245,0.15);
+}
+
+/* Night mode: .out bubble — white stays white, just ensure background tint works on darker primary */
+[data-theme="dark"] .out .mention {
+  color: #ffffff;
+  background: rgba(255,255,255,0.25);
+}