[openstreetmap/openstreetmap-website] Custom layer filters (PR #5347)

[Anton Khorev]

Applies different filters in dark mode: invert+rotate for layers without hillshading, dim for layers with.

Doesn't implement any controls to changing the filter and, consequently, doesn't store selected values. For storing I'd start with deciding if #5339 is ok first.

![image](https://github.com/user-attachments/assets/491ff70f-b783-417b-a69e-b752729773a6)

![image](https://github.com/user-attachments/assets/b39627eb-668c-4ff2-9187-b2f8670e0009)

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5347

-- Commit Summary --

  * Manage base layer switching in L.OSM.Map
  * Set map layer data attribute when switching layers
  * Add map layer data attributes to layer menu buttons
  * Apply invert + hue-rotate filter to select layers

-- File Changes --

    M app/assets/javascripts/leaflet.layers.js (9)
    M app/assets/javascripts/leaflet.map.js (15)
    M app/assets/stylesheets/common.scss (14)
    M app/views/layouts/site.html.erb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5347.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5347.diff

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