fix(fe): remove max-height constraint on approval request list - single screen fit

frontend/src/features/approval/pages/ApprovalQueue.vue

@@ -412,6 +412,10 @@ h3 {
   border-radius: var(--border-radius-lg);
   overflow: hidden;
   background: var(--color-background-primary);
+  display: flex;
+  flex-direction: column;
+  flex: 1;
+  min-height: 0;
 }
 
 .request-list h2 {
@@ -419,6 +423,7 @@ h3 {
   background: var(--color-background-secondary);
   border-bottom: var(--border-width-1) solid var(--color-border-secondary);
   margin: 0;
+  flex-shrink: 0;
 }
 
 .items {
@@ -426,7 +431,8 @@ h3 {
   flex-direction: column;
   gap: var(--spacing-1);
   padding: var(--spacing-2);
-  max-height: 600px;
+  flex: 1;
+  min-height: 0;
   overflow-y: auto;
 }