Make rendering return Result, and handle infinite recursion

src-tauri/yaak-ws/src/error.rs

@@ -13,6 +13,9 @@ pub enum Error {
     #[error("Plugin error: {0}")]
     PluginError(#[from] yaak_plugins::error::Error),
 
+    #[error("Render error: {0}")]
+    TemplateError(#[from] yaak_templates::error::Error),
+
     #[error("WebSocket error: {0}")]
     GenericError(String),
 }