feat(settings): add curated multilingual fonts

Bundle Vazirmatn, Noto Sans Hebrew, Noto Sans SC, and Roboto with locale-aware fallbacks while keeping custom font import out of scope.

Refs #31

src-tauri/src/ipc.rs

@@ -215,12 +215,16 @@ pub enum Theme {
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, TS)]
-#[serde(rename_all = "lowercase")]
+#[serde(rename_all = "kebab-case")]
 #[ts(export, export_to = "../../src/bindings/")]
 pub enum FontFamily {
     System,
     Inter,
     Outfit,
+    Vazirmatn,
+    NotoSansHebrew,
+    NotoSansSc,
+    Roboto,
     Serif,
     Monospace,
 }

src-tauri/src/settings.rs

@@ -196,7 +196,17 @@ fn sanitize_persisted_setting_values(state: &mut Value) {
     sanitize_allowed_string(
         state,
         "fontFamily",
-        &["system", "inter", "outfit", "serif", "monospace"],
+        &[
+            "system",
+            "inter",
+            "outfit",
+            "vazirmatn",
+            "noto-sans-hebrew",
+            "noto-sans-sc",
+            "roboto",
+            "serif",
+            "monospace",
+        ],
     );
     sanitize_allowed_string(
         state,
@@ -704,6 +714,20 @@ mod tests {
         assert!(matches!(settings.font_family, FontFamily::System));
     }
 
+    #[test]
+    fn curated_font_families_are_preserved() {
+        for value in ["vazirmatn", "noto-sans-hebrew", "noto-sans-sc", "roboto"] {
+            let stored = json!({
+                "state": {"fontFamily": value},
+                "version": 5
+            });
+
+            let settings = decode_stored_settings(&Value::String(stored.to_string())).unwrap();
+
+            assert_eq!(serde_json::to_value(settings.font_family).unwrap(), json!(value));
+        }
+    }
+
     #[test]
     fn invalid_window_control_style_uses_automatic_layout() {
         let stored = json!({