fix(ui): restore chat-new-messages class on scroll pill button (#44856)

Merged via squash.

Prepared head SHA: 621ef634a4
Co-authored-by: Astro-Han <255364436+Astro-Han@users.noreply.github.com>
Co-authored-by: altaywtf <9790196+altaywtf@users.noreply.github.com>
Reviewed-by: @altaywtf

CHANGELOG.md

@@ -34,6 +34,7 @@ Docs: https://docs.openclaw.ai
 - Agents/compaction: preserve safeguard compaction summary language continuity via default and configurable custom instructions so persona drift is reduced after auto-compaction. (#10456) Thanks @keepitmello.
 - Agents/tool warnings: distinguish gated core tools like `apply_patch` from plugin-only unknown entries in `tools.profile` warnings, so unavailable core tools now report current runtime/provider/model/config gating instead of suggesting a missing plugin.
 - Slack/probe: keep `auth.test()` bot and team metadata mapping stable while simplifying the probe result path. (#44775) Thanks @Cafexss.
+- Dashboard/chat UI: restore the `chat-new-messages` class on the New messages scroll pill so the button uses its existing compact styling instead of rendering as a full-screen SVG overlay. (#44856) Thanks @Astro-Han.
 
 ## 2026.3.12
 

ui/src/ui/views/chat.ts

@@ -1169,7 +1169,7 @@ export function renderChat(props: ChatProps) {
         props.showNewMessages
           ? html`
             <button
-              class="agent-chat__scroll-pill"
+              class="chat-new-messages"
               type="button"
               @click=${props.onScrollToBottom}
             >