feature: Support for image dimensions syntax (e.g. `=x300`) in image links

[yihao03]

Is your feature request related to a problem? Please describe.

Description

I use markdown syntax that includes image dimensions, which is common in Pandoc or specific markdown flavors (e.g., ![alt](path.png =x300)).

When this syntax is used, render-markdown.nvim fails to correctly identify the line as an image. Instead of concealing the URL and showing the image icon/name (as it does for standard images), it displays the raw content inside the parentheses.

To Reproduce

1. Create a markdown file.
2. Add an image with standard syntax: ![test](image.png).
   • Observation: It renders correctly (e.g., shows the image icon and "test").
3. Add an image with dimensions: ![test](image.png =x300).

Expected Behavior

The plugin should recognize the pattern as a valid image link and render the image icon/label, concealing the path and dimension parameters.

Actual Behavior

The rendering does not trigger for the image link, and the full raw text (image.png =x300) is displayed.

Example:

Expected behaviour

Describe the solution you'd like

Render image with dimensions without the content in the raw parentheses

Describe alternatives you've considered

format the size nicely (omit then path but keeps the size)

Additional information

No response

[MeanderingProgrammer]

This behavior comes from the markdown treesitter parser. That parser tends to follow the CommonMark spec, and I'm not seeing support for this kind of thing in the image spec. The same syntax also does not work in GitHub, which the parser sometimes adopts, so I don't think it will get added.