fix(audience-sample): left-align status bar values when stacked vertically (SDK-314)

The base .status-group has align-items: center which, once the group
switches to flex-direction: column in narrow mode, horizontally centers
the cells instead of left-aligning them. Override to align-items: stretch
so cells fill the full group width and labels/values read left to right.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nattb8

examples/audience/Assets/SampleApp/Resources/AudienceSample.uss

@@ -539,6 +539,7 @@
 
 .narrow .status-group {
     flex-direction: column;
+    align-items: stretch;
     margin-right: 0;
     min-width: 0;
 }