Add dark/tinted icon variants (#9241)

* add tinted icon style

* new dark icon

* use icon composer file

* rename some icons, ensure default ios is still there

* use solid fill instead of auto gradient

* fix web build

* back to gradient

* add . for consistency

* rename `default_old` to `legacy`

.gitignore

@@ -119,3 +119,8 @@ src/locale/locales/**/*.js
 
 # ogcard assets
 bskyogcard/src/assets/fonts/noto-*
+
+# bskyweb build output
+bskyweb/static/media/*.webp
+bskyweb/static/media/*.jpg
+bskyweb/static/media/*.png