Merge branch 'develop' into upstream/2025.5.0

packages/frontend/src/style.scss

@@ -216,7 +216,9 @@ rt {
 
 	box-sizing: border-box;
 	container-type: inline-size;
+}
 
+._spacer > * {
 	/* 子に継承させない */
 	--MI_SPACER-w: initial;
 	--MI_SPACER-min: initial;
@@ -433,6 +435,14 @@ rt {
 	gap: var(--MI-margin);
 }
 
+/**
+ * Use with _gaps, _gaps_m, or _gaps_s.
+ * Place the other class *first*!
+ */
+._h_gaps {
+	flex-direction: row;
+}
+
 ._buttons {
 	display: flex;
 	gap: 8px;