Share native theme components and fix dialog backdrop blur

Centralize native palettes, presets, typography, controls, menus, calendar rendering, and icon assets in ferese-theme. Reuse the shared components across the shell, settings, lock screen, authentication prompt, and screen-sharing chooser.

Attach themed dialogs to compositor-owned materials, correct backdrop capture and sampling across output transforms, smooth patterned backgrounds, and prevent clipped picker buttons with the configured shell font.

Cargo.lock

@@ -1788,7 +1788,11 @@ dependencies = [
 name = "ferese-theme"
 version = "0.1.0"
 dependencies = [
+ "ferese-config",
+ "ferese-protocols",
+ "jiff",
  "libcosmic",
+ "wayland-client",
 ]
 
 [[package]]