style: reduce grid gaps to 6px

frontend/src/backtests/style.css

@@ -28,7 +28,7 @@
 .backtest-form-grid {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 12px 16px;
+  gap: 6px;
 }
 .backtest-form-grid .semi-input-number {
   width: 100%;

frontend/src/components/catalog-table-toolbar.css

@@ -67,7 +67,7 @@
 .catalog-filter-grid {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 16px;
+  gap: 6px;
 }
 .catalog-filter-grid > label {
   display: flex;

frontend/src/pages/AlphaPage.css

@@ -92,7 +92,7 @@
 .alpha-filter-fields {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 16px;
+  gap: 6px;
 }
 .alpha-filter-fields > label {
   margin: 0;

frontend/src/pages/home.css

@@ -44,7 +44,7 @@
 .home-metrics {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 16px;
+  gap: 6px;
   margin-bottom: 20px;
 }
 .home-metric.semi-card,
@@ -142,7 +142,7 @@
 .home-panel-error {
   display: grid;
   justify-items: start;
-  gap: 16px;
+  gap: 6px;
   min-height: 180px;
 }
 .home-calendar-summary {

frontend/src/pages/mcp-keys.css

@@ -62,7 +62,7 @@
 .mcp-key-permissions {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
-  gap: 16px;
+  gap: 6px;
 }
 .mcp-key-permissions label {
   display: flex;

frontend/src/research/workspace.css

@@ -48,7 +48,7 @@
 .research-form-grid {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
-  gap: 16px;
+  gap: 6px;
 }
 .research-toolbar,
 .research-methods,

frontend/src/settings/style.css

@@ -38,7 +38,7 @@
 .settings-grid {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 16px;
+  gap: 6px;
 }
 .settings-field {
   display: flex;