fix: import system fonts list on Android (#998)

Note that the system fonts might not be available in Android webview

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/android/src/main/java/NativeBridgePlugin.kt

@@ -294,6 +294,7 @@ class NativeBridgePlugin(private val activity: Activity): Plugin(activity) {
                 var fontName = fileFileName
                     .replace(Regex("\\.(ttf|otf)$", RegexOption.IGNORE_CASE), "")
                     .trim()
+                fontList.add(fontName)
             }
             ret.put("fonts", JSONArray(fontList))
         } catch (e: Exception) {

apps/readest-app/src/app/reader/components/settings/FontPanel.tsx

@@ -137,7 +137,7 @@ const FontPanel: React.FC<{ bookKey: string }> = ({ bookKey }) => {
   useEffect(() => {
     if (isTauriAppPlatform()) {
       getSysFontsList().then((res) => {
-        if (res.error) {
+        if (res.error || res.fonts.length === 0) {
           console.error('Failed to get system fonts list:', res.error);
           return;
         }