feat(unified-mobile-desktop-ui): Complete US-514 - Fix Spațiu Blank Excesiv Top (Toate Paginile)

Implemented by Ralph autonomous loop.
Iteration: 15

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

src/modules/reports/views/DetailedInvoicesView.vue

@@ -894,8 +894,9 @@ onUnmounted(() => {
 }
 
 /* Page Header - Desktop only */
+/* US-514: Reduced from var(--space-xl) to var(--space-md) for less excessive top spacing */
 .page-header {
-  margin-bottom: var(--space-xl);
+  margin-bottom: var(--space-md);
 }
 
 .page-title {