[openstreetmap/openstreetmap-website] Use CSS filter instead of dimming tiles (PR #5325)

[pkrasicki]

Alternative proposal:
![image](https://github.com/user-attachments/assets/daf6c2e9-42a8-4253-8fae-7b2a38cc3e8d)

`filter: brightness(0.6) invert(1) contrast(3) hue-rotate(200deg) saturate(0.3) brightness(0.7);`

You can test it here: https://issviewer.com
Full source code: https://github.com/pkrasicki/issviewer

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