fix(editor): edgeless can't slider with finger (#15091)

fix bug edgeless can't slider with finger 

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

* **New Features**
* Added mobile immersive edgeless mode with dynamic chrome auto-hide and
tap-gesture controls.
  * Added a mobile zoom ruler UI for edgeless.
* **Bug Fixes**
* Improved iOS rendering/zoom by applying low-zoom survival behavior,
gesture-aware refresh deferral, and effective-DPR canvas scaling.
* Fixed iOS webview zoom/bounce and process-termination reload behavior.
  * Improved placeholder styling with theme-aware colors.
* **Chores**
  * Updated local ignore rules and iOS app build/version configuration.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: DarkSky <darksky2048@gmail.com>

blocksuite/docs/api/@blocksuite/std/gfx/functions/getEffectiveDpr.md

@@ -0,0 +1,28 @@
+[**BlockSuite API Documentation**](../../../../README.md)
+
+***
+
+[BlockSuite API Documentation](../../../../README.md) / [@blocksuite/std](../../README.md) / [gfx](../README.md) / getEffectiveDpr
+
+# Function: getEffectiveDpr()
+
+> **getEffectiveDpr**(`zoom`, `rawDpr`): `number`
+
+Resolves the effective device-pixel-ratio for canvas backing stores at the
+given zoom, honoring [viewportRuntimeConfig.CANVAS\_DPR\_CAP\_BY\_ZOOM](../variables/viewportRuntimeConfig.md#canvas_dpr_cap_by_zoom).
+
+Returns the raw `window.devicePixelRatio` when no cap applies.
+
+## Parameters
+
+### zoom
+
+`number`
+
+### rawDpr
+
+`number` = `window.devicePixelRatio`
+
+## Returns
+
+`number`