fix(migration): add Status column back to DashboardDataGrid

Restored the Status column (published/draft badge) that was dropped during
the DashboardGrid→DashboardDataGrid migration. The text filter now searches
status values as intended. Validate/Git columns remain removed as they are
irrelevant to the migration workflow.

frontend/src/routes/migration/+page.svelte

@@ -263,6 +263,17 @@
               columns={[
                 { key: 'title', label: $t.dashboard?.title || 'Title', sortable: true },
                 { key: 'last_modified', label: $t.dashboard?.last_modified || 'Last Modified', sortable: true },
+                {
+                  key: 'status',
+                  label: $t.dashboard?.status || 'Status',
+                  sortable: true,
+                  raw: true,
+                  render: (item: any) => {
+                    const isPublished = item.status === 'published';
+                    const cls = isPublished ? 'bg-success-light text-success' : 'bg-surface-muted text-text';
+                    return `<span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium ${cls}">${item.status || ''}</span>`;
+                  },
+                },
               ]}
               bind:selectedIds={model.selectedDashboardIds}
               selectable