feat(editor): add date grouping configurations (#12679)

https://github.com/user-attachments/assets/d5578060-2c8c-47a5-ba65-ef2e9430518b

This PR adds the ability to group-by date with configuration which an
example is shown in the image below:


![image](https://github.com/user-attachments/assets/8762342a-999e-444e-afa2-5cfbf7e24907)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Date-based grouping modes (relative, day, week Sun/Mon, month, year),
a date group renderer, and quick lookup for group-by configs by name.

* **Improvements**
* Enhanced group settings: date sub‑modes, week‑start, per‑group
visibility, Hide All/Show All, date sort order, improved drag/drop and
reorder.
* Consistent popup placement/middleware, nested popup positioning,
per‑item close-on-select, and enforced minimum menu heights.
* UI: empty groups now display "No <property>"; views defensively handle
null/hidden groups.

* **Tests**
  * Added unit tests for date-key sorting and comparison.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Norkz <richardlora557@gmail.com>
Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

packages/backend/server/src/plugins/payment/revenuecat/service.ts

@@ -183,8 +183,9 @@ export class RevenueCatService {
       return ent.products.items;
     }
     const entId = ent.id;
-    if (this.productsCache.has(entId)) {
-      return this.productsCache.get(entId)!;
+    const cachedProduct = this.productsCache.get(entId);
+    if (cachedProduct) {
+      return cachedProduct;
     }
 
     const res = await fetch(