## Problem
When using LLMs, it's useful to describe your tables in markdown format.
## Solution
- Add an _Copy as SQL_ and _Copy as Markdown_ in the schema visualiser
table menu
<img width="320" height="235" alt="image"
src="https://github.com/user-attachments/assets/b465d6aa-a011-4308-86de-78725328630b"
/>
- Refactor the _Copy as SQL_ and _Download current view_ buttons in a
single button/dropdown combo and add _Copy as markdown_:
<img width="333" height="143" alt="image"
src="https://github.com/user-attachments/assets/a823988b-abff-4840-b5a5-53a5830065b4"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* "Copy as Markdown" for schemas and individual tables.
* "Copy as SQL" for individual tables.
* Per-column descriptions included in schema/table exports.
* **Style**
* Export actions consolidated into a compact, grouped dropdown with
adjacent copy action for streamlined header controls.
* **Tests**
* Unit tests for markdown export helpers.
* E2E tests updated to use the new export UI and adjusted dialog timing.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
