refactor: better logs

src/lib/logger.ts

@@ -1,12 +1,32 @@
-import { attachConsole } from "@tauri-apps/plugin-log";
+import { attachConsole, error as logError } from "@tauri-apps/plugin-log";
 
 let consoleAttached = false;
+let errorsForwarded = false;
+
+function describe(reason: unknown): string {
+  if (reason instanceof Error) return reason.stack ?? reason.message;
+  return typeof reason === "string" ? reason : JSON.stringify(reason);
+}
 
 export async function setupLogging() {
   if (consoleAttached) {
     return;
   }
 
+  // Only uncaught failures go to the log file. Forwarding console.error too
+  // would loop: attachConsole writes every backend line back to the console.
+  if (!errorsForwarded) {
+    errorsForwarded = true;
+    window.addEventListener("error", (event) => {
+      void logError(
+        `Uncaught error err="${describe(event.error ?? event.message)}" source=${event.filename}:${event.lineno}:${event.colno}`,
+      );
+    });
+    window.addEventListener("unhandledrejection", (event) => {
+      void logError(`Unhandled rejection err="${describe(event.reason)}"`);
+    });
+  }
+
   try {
     await attachConsole();
     consoleAttached = true;