Change the layer control icon

[giswqs]

[github-actions]

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[Copilot]

Pull request overview

This PR updates the layer control icon from a CSS-based design (using box-shadow for stacked lines) to an inline SVG icon representing stacked layers. The change improves visual clarity and robustness across different color schemes.

• Replaces CSS pseudo-element icon with an inline SVG "layers" glyph
• Updates CSS to support the new SVG icon and enforce dark icon color
• Removes the old CSS-based icon implementation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
anymap/static/maplibre_widget.js	Adds inline SVG icon markup to the layer control button element
anymap/static/maplibre_widget.css	Updates styles to support SVG icon, removes old CSS-based icon, and enforces dark icon color

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[Copilot]

The hardcoded dark color with !important may cause accessibility issues in dark mode themes where a light icon would be more appropriate. Consider using a CSS variable or data attribute to support theme-aware icon colors instead of forcing a dark color.