supabase / supabase / 21875646433

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fix:  CSV drag and drop (#42656)

## Problem

Drag-and-drop CSV import functionality is broken in the Table Editor
when tables are empty. The `pointer-events-none` CSS class on the empty
state overlay blocks all pointer events, including drag events,
preventing users from dropping CSV files onto empty tables.

## Solution

Move drag event handlers (`onDragOver`, `onDragLeave`, `onDrop`) from
the inner overlay div to the parent container div.
This allows:
- Drag events to be captured by the parent container
- The overlay to retain `pointer-events-none` for proper horizontal
scrolling
-  (as intended in #42618)
- Interactive elements inside to use `pointer-events-auto`

This follows the existing pattern used in `FileExplorerColumn.tsx` where
drag handlers are on the parent container while visual overlays have
`pointer-events-none`.

 ## Related 
- Closes https://github.com/supabase/supabase/issues/42655  
- Extends https://github.com/supabase/supabase/pull/42618


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

## Summary by CodeRabbit

* **Bug Fixes**
  * Improved drag-and-drop event detection scope in the grid component.

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

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