chore(editor): mobile database editing experimental flag (#13425)

#### PR Dependency Tree


* **PR #13425** 👈

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**
* Introduced a feature flag to enable or disable mobile database
editing.
* Added user notifications on mobile when attempting to edit databases
if the feature is not enabled.

* **Bug Fixes**
* Prevented addition of filters and group actions in readonly or
restricted mobile editing states.
* Fixed issues with selection handling in mobile Kanban and Table views
by ensuring correct context binding.

* **Style**
  * Improved toast notification styling to allow dynamic height.
* Adjusted mobile table view styles for better compatibility on iOS
devices.

* **Chores**
* Updated feature flag configuration to support mobile database editing
control.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/database/src/data-source.ts

@@ -164,8 +164,10 @@ export class DatabaseBlockDataSource extends DataSourceBase {
   readonly$: ReadonlySignal<boolean> = computed(() => {
     return (
       this._model.store.readonly ||
-      // TODO(@L-Sun): use block level readonly
-      IS_MOBILE
+      (IS_MOBILE &&
+        !this._model.store.provider
+          .get(FeatureFlagService)
+          .getFlag('enable_mobile_database_editing'))
     );
   });