add include option and resizing

[Heiss]

This PR enables to include files and make a small QoL improvement, so parsed images can be resized via leftclick on the image.

```structurizr
@from-file:workspace.dsl
```

The syntax is following the kroki-plugin for mkdocs and so it can be used with it to publish the vault e.g. digital garden and other stuff.

[gregzuro]

Thanks @Heiss — the @from_file: include feature is in 1.3.0 (#29, https://github.com/gregzuro/obsidian-kroki/releases/tag/1.3.0).

Small differences from the PR:

• Path resolution uses getAbstractFileByPath + instanceof TFile rather than getFileByPath (the latter is 1.5.7+ and would have forced a minAppVersion bump). cachedRead is unchanged.
• Missing file → an inline .kroki-error message in the rendered diagram rather than a silent console.log + broken render.
• The switch from inline SVG to <img> isn't taken verbatim. Inline SVG (via DOMParser, not innerHTML) is kept on desktop so in-SVG <a xlink:href> links stay clickable (obsidian internal links not working for graphviz #9). On mobile (Platform.isMobile) and on any fetch/parse failure we fall back to <img src=krokiUrl> — which gives you the resizing benefit the PR was after and also fixes mobile (Diagrams don’t render on Obsidian mobile #8).

Sizing is handled by styles.css (max-width: 100%, height: auto) instead of inline attributes, so it cooperates with the user's theme. Closing — thanks for both ideas.