tweak(ui): file tree background color

packages/app/src/pages/session/session-side-panel.tsx

@@ -354,7 +354,7 @@ export function SessionSidePanel(props: {
                     {language.t("session.files.all")}
                   </Tabs.Trigger>
                 </Tabs.List>
-                <Tabs.Content value="changes" class="bg-background-base px-3 py-0">
+                <Tabs.Content value="changes" class="bg-background-stronger px-3 py-0">
                   <Switch>
                     <Match when={hasReview()}>
                       <Show
@@ -383,7 +383,7 @@ export function SessionSidePanel(props: {
                     </Match>
                   </Switch>
                 </Tabs.Content>
-                <Tabs.Content value="all" class="bg-background-base px-3 py-0">
+                <Tabs.Content value="all" class="bg-background-stronger px-3 py-0">
                   <FileTree
                     path=""
                     modified={diffFiles()}

packages/ui/src/components/tabs.css

@@ -274,6 +274,7 @@
       padding-inline: 12px;
       gap: 8px;
       align-items: center;
+      background-color: var(--background-stronger);
     }
 
     [data-slot="tabs-trigger-wrapper"] {