[BUG] `reinit` with `fontSize` doesn't update the editor

[be5invis]

I was using reinit to resize the text in React and I found that it is not effective.

 // Handle prop updates (theme, toolbar, etc)
React.useEffect(() => {
    if (overtypeRef.current) {
        console.log("Updating overtype font size to", $.textSize);
        overtypeRef.current.reinit({
            fontSize: `${props.textSize}px`,
        });
    }
}, [props.textSize]);

[panphora]

Fixed in v2.3.6 (commit db18a22).

Root cause: reinit() updated this.options correctly but the --instance-* CSS custom properties (font-size, line-height, padding, font-family) were only set during the initial init(). _applyOptions() — which reinit() runs — never touched them.

Fix: extracted the four setProperty calls into a private _applyInstanceCSSVars() helper and call it from both _applyOptions() and the init paths. reinit({ fontSize: '20px' }) now propagates to both the textarea and the preview overlay (alignment preserved).

Thanks @be5invis for the report.