add: option to use inter font instead

crates/core/src/model/auth.rs

@@ -372,6 +372,9 @@ pub struct UserSettings {
     /// Hide all badges from your username (everywhere but on profile).
     #[serde(default)]
     pub hide_username_badges: bool,
+    /// If the user's system font is always used over Lexend.
+    #[serde(default)]
+    pub use_system_font: bool,
 }
 
 fn mime_avif() -> String {