fix(desktop): mask text behind sticky user messages

apps/desktop/src/components/assistant-ui/thread/user-message.tsx

@@ -42,6 +42,7 @@ export function StickyHumanMessageContainer({
     <>
       <div
         className="group/user-message sticky z-40 -mx-4 flex w-[calc(100%+2rem)] min-w-0 max-w-none flex-col items-stretch gap-0 self-end overflow-visible bg-(--ui-chat-surface-background) px-4 pb-(--conversation-turn-gap) pt-1"
+        data-glass-opaque=""
         data-message-id={messageId}
         data-role="user"
         data-slot="aui_user-message-root"

apps/desktop/src/styles.css

@@ -1560,7 +1560,20 @@ body.guest-pointer-lock :is(webview, iframe) {
 }
 
 [data-slot='aui_user-message-root'] {
-  top: var(--sticky-human-top);
+  --sticky-human-offset: calc(var(--sticky-human-top) + 1px);
+  top: var(--sticky-human-offset);
+}
+
+/* Cover the gap above the floating bubble with the thread's solid surface. */
+[data-slot='aui_user-message-root']::before {
+  content: '';
+  position: absolute;
+  z-index: -1;
+  inset-inline: 0;
+  top: calc(-1 * var(--sticky-human-offset));
+  height: calc(var(--sticky-human-offset) + 1rem);
+  pointer-events: none;
+  background: var(--ui-chat-surface-background);
 }
 
 [data-slot='aui_user-message-root'],