## Context
Adds the `DownloadResultsButton` component to the footer of the
explorer's query editor - will show up in notebook + query tab
<img width="1147" height="907" alt="image"
src="https://github.com/user-attachments/assets/141278a8-1e00-424e-84ec-8ddb7cf0a96b"
/>
<img width="1152" height="913" alt="image"
src="https://github.com/user-attachments/assets/0e4a48b0-ebc3-473e-8bc0-19ab633e1904"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Added a results footer displaying row counts and optional row limits.
- Added download and export actions when query results are available.
- Standardized the results footer across query and notebook previews.
- Added keyboard shortcut hints to export options when shortcuts are
enabled.
- **Improvements**
- Export actions now support read-only result sets without changing
displayed output.
- Export menu sizing and shortcut labels adapt to the enabled shortcut
configuration.
- Improved accessibility with a label for refreshing logs.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->