excaliburjs / Excalibur / 19674931311 / 1

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docs: adds type checking to all samples (#3568)

## Changes:

- upgrade docs typescript to match engine typescript version - resolves `NoInfer` failing in docs
- fix physics sample to use `solver` instead of now removed `ex.Physics.useRealisticPhysics`
- fix scene transition sample to use `goToScene` instead of now removed `goto`
- removed embedded particle samples, replacing them with local samples that can be type checked
- embed all samples as playgrounds that autoplay
- types can be checked from within the docs site directory with `npm run typecheck:samples`
  - can be validated locally by changing any sample and seeing the above command fail

<table>
<tr>
<td>
<img width="1972" height="2290" alt="image" src="https://github.com/user-attachments/assets/6f60c854-0d6a-4d66-9a14-0b7661004c97" />
</td>
<td>
<img width="1862" height="2418" alt="CleanShot 2025-11-26 at 00 20 23@2x" src="https://github.com/user-attachments/assets/076df3ad-094f-4371-a500-ce9e0cfc10ef" />
</td>
</tr>
<tr>
<td>Physics sample</td>
<td>Animation sample</td>
</tr>
</table>

## Missing:

Its late, and I'm probably blind, but I couldn't trace the deployment step in the `.github` workflows?

I need to add `npm run typecheck:samples` prior to the docs build.

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