fix: show activity board columns again

Give the kanban the remaining page height so the columns are no longer collapsed.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/components/activities/ActivitiesKanban.vue

@@ -440,7 +440,11 @@ function openActivity(id: string) {
 .kanban-wrap {
   container-type: inline-size;
   container-name: pipeline;
+  flex: 1 1 auto;
   min-width: 0;
+  min-height: 0;
+  display: flex;
+  flex-direction: column;
 }
 
 .muted {

apps/web/src/views/ActivitiesView.vue

@@ -1465,10 +1465,12 @@ onUnmounted(() => {
 
 <style scoped>
 .page {
-  display: grid;
-  grid-template-columns: minmax(0, 1fr);
+  display: flex;
+  flex-direction: column;
   gap: 1rem;
   min-width: 0;
+  min-height: 0;
+  height: 100%;
 }
 
 .crumbs {