Balance column heights to eliminate sky view gap

Precise calculation showed mission-drawer (~1100px) was 213px taller
than command-rail content (~887px), leaving 213px of empty background
at the bottom of the right column.

Three targeted reductions to mission-drawer height (~234px total):
- drawer-actions: stacked 1-column → 3-column row (-76px)
- drawer-list: max-height 240px → 180px (-40px)
- drawer-info-grid: 1-column → 2-column for Quick Info (-118px)

Mission-drawer drops to ~866px, command-rail (~887px) now drives the
primary-layout row height — gap closes.

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

static/css/satellite_dashboard.css

@@ -374,8 +374,8 @@ body {
 
 .drawer-actions {
     display: grid;
-    grid-template-columns: 1fr;
-    gap: 8px;
+    grid-template-columns: repeat(3, 1fr);
+    gap: 6px;
 }
 
 .drawer-action-btn {
@@ -449,7 +449,7 @@ body {
 
 .drawer-list {
     min-height: 0;
-    max-height: 240px;
+    max-height: 180px;
     overflow-y: auto;
 }
 
@@ -552,8 +552,8 @@ body {
 
 .drawer-info-grid {
     display: grid;
-    grid-template-columns: 1fr;
-    gap: 8px;
+    grid-template-columns: repeat(2, 1fr);
+    gap: 6px;
 }
 
 .drawer-info-card {