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.

crates/ferese-theme/Cargo.toml

@@ -6,4 +6,8 @@ license.workspace = true
 rust-version = "1.95"
 
 [dependencies]
+jiff.workspace = true
+ferese-config = { path = "../ferese-config" }
 libcosmic.workspace = true
+ferese-protocols = { path = "../ferese-protocols", default-features = false, features = ["client"] }
+wayland-client.workspace = true