Refactor account card title and layout styles for improved UI consistency

src/Duempelkas.Desktop/wwwroot/css/app.css

@@ -51,6 +51,13 @@ html, body {
     background-color: var(--color-surface);
     border: 1px solid var(--color-border);
     border-radius: 0.75rem;
+    padding: .5rem;
+    margin-bottom: .5rem;
+}
+
+.account-card .card-title {
+    color: var(--color-text);
+    font-weight: normal;
 }
 
 .account-card:hover {
@@ -93,7 +100,8 @@ html, body {
     background-color: var(--color-surface);
     border: 1px solid var(--color-border);
     border-radius: 0.75rem;
-    padding: 1rem 1.25rem;
+    padding: .5rem .75rem;
+    margin-bottom: .5rem;
 }
 
 .summary-flex {
@@ -426,9 +434,7 @@ html, body {
 
 /* Container */
 .container-fluid {
-    width: 100%;
-    padding-left: 1rem;
-    padding-right: 1rem;
+    
 }
 
 /* Spinner (Bootstrap component fallback) */