Mdfx css fixes

[dlemmermann]

Using em values for fonts is very important.
No hardcoded font for just this control ... we need to pick up the global theme.

[Copilot]

Pull request overview

This PR updates the MDFX default styling to better respect the application’s global JavaFX theme by removing hardcoded font settings and switching various sizes to relative units, while consolidating code-block styling into the main MDFX stylesheet.

Changes:

• Scope MDFX looked-up colors and styling variables and replace hardcoded colors with JavaFX theme colors in mdfx.css.
• Replace fixed heading font sizes with em values and normalize various paddings/spacings to explicit px units.
• Remove MarkdownCodeBlock’s dedicated user-agent stylesheet and delete markdown-code-block.css, moving code-block rules into mdfx.css.
• Update the example to add padding and apply the markdown-view style class.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
jpro-mdfx/src/main/resources/one/jpro/platform/mdfx/mdfx.css	Theme-aligned looked-up colors, sizing adjustments, and consolidated block quote/code block styling.
jpro-mdfx/src/main/resources/one/jpro/platform/mdfx/markdown-code-block.css	Removed (styles moved into mdfx.css).
jpro-mdfx/src/main/java/one/jpro/platform/mdfx/MarkdownCodeBlock.java	Removes per-control UA stylesheet hookup for code blocks.
jpro-mdfx/example/src/main/java/one/jpro/platform/mdfx/example/MarkdownViewSample.java	Adjusts sample padding and adds required style class (plus a problematic import).

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