fix(editor): database behavier (#14394)

fix #13459
fix #13707
fix #13924

#### PR Dependency Tree


* **PR #14394** 👈

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**
* Improved URL paste: text is split into segments, inserted correctly,
and single-URL pastes create linked-page references.

* **UI Improvements**
  * Redesigned layout selector with compact dynamic options.
* Number-format options are always available in table headers and mobile
menus.

* **Bug Fixes**
  * More consistent paste behavior for mixed text+URL content.
  * Prevented recursive selection updates when exiting edit mode.

* **Tests**
* Added tests for URL splitting, paste insertion, number formatting, and
selection behavior.

* **Chores**
* Removed number-formatting feature flag; formatting now applied by
default.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/shared/src/services/feature-flag-service.ts

@@ -2,7 +2,6 @@ import { type Store, StoreExtension } from '@blocksuite/store';
 import { type Signal, signal } from '@preact/signals-core';
 
 export interface BlockSuiteFlags {
-  enable_database_number_formatting: boolean;
   enable_database_attachment_note: boolean;
   enable_database_full_width: boolean;
   enable_block_query: boolean;
@@ -28,7 +27,6 @@ export class FeatureFlagService extends StoreExtension {
   static override key = 'feature-flag-server';
 
   private readonly _flags: Signal<BlockSuiteFlags> = signal({
-    enable_database_number_formatting: false,
     enable_database_attachment_note: false,
     enable_database_full_width: false,
     enable_block_query: false,