Update branding

Update the Ferese symbols, appearance-specific wallpapers, and rounded wallpaper and theme previews. Bundle Figtree and add the Ferese name to the website header.

Verified configuration, theme, Settings, wallpaper and installer tests, both UI renderers, the static site build, and browser layouts.

crates/ferese-config/src/lib.rs

@@ -38,13 +38,26 @@ pub fn config_path() -> Option<PathBuf> {
 }
 
 pub fn default_wallpaper() -> &'static str {
-    static PATH: std::sync::OnceLock<String> = std::sync::OnceLock::new();
-    PATH.get_or_init(|| {
+    default_wallpaper_for(theme::Appearance::Dark)
+}
+
+pub fn default_wallpaper_for(appearance: theme::Appearance) -> &'static str {
+    static LIGHT: std::sync::OnceLock<String> = std::sync::OnceLock::new();
+    static DARK: std::sync::OnceLock<String> = std::sync::OnceLock::new();
+    let (slot, name) = match appearance {
+        theme::Appearance::Light => (&LIGHT, "ferese-wallpaper-light.png"),
+        theme::Appearance::Dark => (&DARK, "ferese-wallpaper-dark.jpg"),
+    };
+    slot.get_or_init(|| {
         let path = std::env::current_exe()
             .ok()
-            .and_then(|path| path.parent().map(|dir| dir.join("wallpapers/ferese.png")))
+            .and_then(|path| path.parent().map(|dir| dir.join("wallpapers").join(name)))
             .filter(|path| path.is_file())
-            .unwrap_or_else(|| PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../../assets/wallpapers/ferese.png"));
+            .unwrap_or_else(|| {
+                PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+                    .join("../../assets/wallpapers")
+                    .join(name)
+            });
 
         path.canonicalize().unwrap_or(path).to_string_lossy().into_owned()
     })