Support multi select logs and add CTA (#45974)

## Context

Supports selecting log rows and allow to copy / ask assistant for
selected rows, similar to what we had for the old logs UI
Selection will clear whenever the search parameters change

<img width="1448" height="413" alt="image"
src="https://github.com/user-attachments/assets/b81b359c-28c3-48a8-9895-e77327ebd33e"
/>


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

* **New Features**
  * Multi-row selection with an action header showing selected count
  * Copy selected logs as JSON or Markdown from a dropdown
* "Explain with AI" action to open the assistant pre-filled with
selected logs
  * Clear selection button

* **Refactor**
* Row/detail selection now syncs with the URL for shareable views and
improves next/previous navigation and panel behavior

* **Style**
  * Minor visual tweak to column level indicator dot size

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apps/studio/components/ui/DataTable/DataTableColumn/DataTableColumnLevelIndicator.tsx

@@ -16,7 +16,7 @@ export const DataTableColumnLevelIndicator = ({
     <div className={cn('flex items-center justify-center', className)}>
       <div
         className={cn(
-          'h-2.5 w-2.5 rounded-[2px]',
+          'h-2 w-2 rounded-full',
           getLevelColor(value).bg,
           getLevelColor(value).border,
           dotClassName