fix(mobile): align Agents empty-state New session with Home's primary action

apps/mobile/src/components/agents/live-session-list-empty-state.tsx

@@ -29,14 +29,14 @@ export function LiveSessionListEmptyState({
       description={t('agents.sessionList.noSessionsYetDescription')}
       action={
         <Button
-          variant="outline"
+          variant="default"
           className="max-w-full"
           accessibilityLabel={t('common.newSession')}
           onPress={() => {
             router.push(getNewAgentSessionPath(organizationId) as Href);
           }}
         >
-          <Plus size={16} color={colors.foreground} />
+          <Plus size={16} color={colors.primaryForeground} />
           <Text className="shrink text-center">{t('common.newSession')}</Text>
         </Button>
       }

apps/mobile/src/components/agents/session-list-screen.mounted.test.tsx

@@ -512,6 +512,18 @@ describe('AgentSessionListScreen live presentation', () => {
     expect(label.props.adjustsFontSizeToFit).not.toBe(true);
   });
 
+  it('renders the empty-state New session action as the tab’s primary affordance', async () => {
+    await renderScreen();
+    const createAction = action('New session');
+    // One primary action per surface: the Agents empty state's only action is
+    // the same new-session flow Home surfaces as a filled brand-yellow button,
+    // so it must carry the primary variant rather than a low-emphasis outline.
+    expect(createAction.props.className).toContain('bg-primary');
+    expect(createAction.props.className).not.toContain('bg-card');
+    const icon = createAction.findByType('Plus');
+    expect(icon.props.color).toBe('#ffffff');
+  });
+
   it('keeps cold-loading feedback stable until an accepted result', async () => {
     state.live.hasAcceptedSuccess = false;
     state.live.isLoading = true;