refactor(miniapp): remove placeholder shell cards

apps/miniapp/src/index.css

@@ -228,13 +228,15 @@ button {
 }
 
 .balance-list,
-.ledger-list {
+.ledger-list,
+.home-grid {
   display: grid;
   gap: 12px;
 }
 
 .balance-item,
-.ledger-item {
+.ledger-item,
+.stat-card {
   border: 1px solid rgb(255 255 255 / 0.08);
   border-radius: 18px;
   padding: 14px;
@@ -260,6 +262,27 @@ button {
   margin-top: 6px;
 }
 
+.home-grid {
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+}
+
+.stat-card {
+  display: grid;
+  gap: 8px;
+}
+
+.stat-card span {
+  color: #c6c2bb;
+  font-size: 0.82rem;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+}
+
+.stat-card strong {
+  font-family: 'Space Grotesk', 'IBM Plex Sans', sans-serif;
+  font-size: clamp(1.2rem, 4vw, 1.7rem);
+}
+
 .panel--wide {
   min-height: 170px;
 }
@@ -275,6 +298,10 @@ button {
     grid-template-columns: 1.3fr 1fr 1fr;
   }
 
+  .home-grid {
+    grid-template-columns: repeat(4, minmax(0, 1fr));
+  }
+
   .panel--wide {
     grid-column: 1 / -1;
   }