fix: dashboard edit previews, migration journal, and notes comments

Register drizzle journal entries for 0022/0023 so prod migrations apply.

Key edit-mode widget previews by index so bangs.stats shows live data.

Add comments to notes detail pages.

src/lib/dashboard.ts

@@ -11,7 +11,12 @@ export type WidgetPlacement = {
 };
 
 export function widgetContentKey(placement: Pick<WidgetPlacement, "widgetId" | "config">): string {
-  return `${placement.widgetId}::${JSON.stringify(placement.config)}`;
+  return `${placement.widgetId}::${JSON.stringify(placement.config ?? null)}`;
+}
+
+/** Stable key for edit-mode widget preview map (index-aligned with layout.widgets). */
+export function widgetContentIndexKey(index: number): string {
+  return String(index);
 }
 
 export type DashboardLayout = {