revert(trip): restore stat-label to --text-xs

Small label is intentional — the contrast with the larger value is the
visual hierarchy. Revert the sm bump from the previous commit.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr

themes/intotheeast/css/style.css

@@ -611,7 +611,7 @@ body::after {
 
 .stat-label {
     display: block;
-    font-size: var(--text-sm);
+    font-size: var(--text-xs);
     font-weight: 600;
     color: var(--color-ink-muted);
     text-transform: uppercase;