feat: size widgets before adding

packages/widgets/src/modals/widget-edit-modal.module.css

@@ -26,6 +26,24 @@
   pointer-events: none;
 }
 
+.previewSizeControls {
+  position: absolute;
+  z-index: 3;
+  top: var(--mantine-spacing-xs);
+  left: var(--mantine-spacing-xs);
+  padding: 0.25rem 0.375rem;
+  border: 1px solid var(--mantine-color-default-border);
+  border-radius: var(--mantine-radius-sm);
+  background: color-mix(in srgb, var(--mantine-color-body) 92%, transparent);
+  box-shadow: var(--mantine-shadow-xs);
+  backdrop-filter: blur(8px);
+}
+
+.previewSizeInput {
+  width: 5rem;
+  font-variant-numeric: tabular-nums;
+}
+
 .previewCanvas {
   position: relative;
   width: 100%;