Icon and IconLink components (and potentially others) using hideMode: 'visibility' fail to reappear after being hidden.

Diagnosis:
The show() method in src/component/Base.mjs attempts to restore visibility by deleting the visibility property from the style object:

let style = me.style;
delete style.visibility;
me.style = style;

However, debug logs confirm that vdom.style retains {visibility: 'hidden'} even after me.style becomes {}. This suggests that vdom.style (or wrapperStyle) might be retaining the property, or the spread merge {...me.wrapperStyle, ...me.style} in updateStyle is not clearing it as expected.

Solution:
Override afterSetHidden in Icon.mjs and IconLink.mjs to explicitly set visibility: 'visible' (or null) instead of relying on property deletion. This forces a value change that propagates to the VDOM delta.

Long-term:
Investigate if Component.mjs show() needs a generic fix (e.g. setting null instead of delete).