Add table rendering for Apple doc JSON

[mattt]

Resolves #26

On pages like https://developer.apple.com/documentation/professional-video-applications/import-options, Sosumi.ai wasn't rendering table content (https://sosumi.ai/documentation/professional-video-applications/import-options?language=objc).

This PR adds code to render tables in GFM / CommonMark format.

  ## Overview
  
  The `import-options` element can contain zero or more `option` elements. The `option` element describes options for importing events and projects into Final Cut Pro through the key-value pair in the attributes listed below.
  
+ | Attributes | Description |
+ | --- | --- |
+ | `key` | A string that identifies one of the following import options:  `copy assets`: Copy or link assets referenced in the imported XML. Valid values are `1` (copy) and `0` (link).    `library location`: Specifies the location (URL) of the library to which to add the event or project. If the specified URL represents a directory, Final Cut Pro uses the default library name. If no library exists at the location specified in the XML, Final Cut Pro creates a new library.  `suppress warnings`: Suppress or show warnings generated during import. Valid values are `≥1` (suppress) and `0` (show)   `base url`: A URL to resolve a relative URL given in the XML as the value of the `src` attribute of a `resources` element. |
+ | `value` | The value for the import option. |

[Copilot]

Pull request overview

Adds Markdown table rendering support to the Apple documentation JSON renderer so table content from ProApps docs is displayed correctly on Sosumi.ai (fixing missing information noted in #26).

Changes:

• Extend the main content renderer to handle type: "table" items.
• Implement a renderTable helper that emits GFM/CommonMark table syntax from Apple’s header: "row" + rows structure.
• Add a unit test validating header + separator + body row output for table rendering.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/lib/reference/render.ts	Adds type: "table" handling and implements renderTable to output GFM tables from Apple doc JSON.
tests/render.test.ts	Adds a table-rendering test case to prevent regressions and validate expected Markdown output.

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