fix(B08): 본문 안쪽 여백을 M02 본문과 같게(위아래 16 · 좌우 24) — 좌측 패널과 간격 24(73-13)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MgChuAcyBqUkhHMTXomQC7

B08_Quantity/B08_Quantity_UI_Page.css

@@ -4,6 +4,7 @@
   display: flex;
   flex-direction: column;
   gap: var(--spacing-16);
+  padding: var(--spacing-16) var(--spacing-24); /* M02 본문(.m02-main)과 같은 값 */
 }
 
 .b08-quantity .ui-general-block__empty {