feat(editor): calendar view for database block (#14984)

fix #13663


#### PR Dependency Tree


* **PR #14984** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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

* **New Features**
* Calendar view for database blocks (month layout, entry cards,
external-source support)
  * Workspace calendar integration and new slash-menu "Calendar View"

* **Improvements**
* Create/manage database rows from calendar UI; preserve durations when
moving/resizing ranges
* Drag-and-drop, drop-preview, and hit-testing support for calendar and
docs
  * Redesigned in-menu View settings with multi-page navigation
  * Context-menu input autofocus toggle and conditional back-navigation

* **Tests**
* New unit and E2E suites covering calendar layout, interactions,
sources, and slash-menu integration
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/components/src/context-menu/menu-renderer.ts

@@ -111,8 +111,10 @@ export class MenuComponent
         }
         const onBack = this.menu.options.title?.onBack;
         if (e.key === 'Backspace' && onBack && !this.menu.showSearch$.value) {
-          this.menu.close();
-          onBack(this.menu);
+          const result = onBack(this.menu);
+          if (result !== false) {
+            this.menu.close();
+          }
           return;
         }
         if (e.key === 'Enter' && !e.isComposing) {
@@ -214,8 +216,10 @@ export class MenuComponent
         ${title.onBack
           ? html` <div
               @click="${() => {
-                title.onBack?.(this.menu);
-                this.menu.close();
+                const result = title.onBack?.(this.menu);
+                if (result !== false) {
+                  this.menu.close();
+                }
               }}"
               class="dv-icon-20 dv-hover dv-pd-2 dv-round-4"
               style="display:flex;"