Add custom errors with thiserror, log thread id

src/routes/components/schedule/generate.svelte

@@ -34,16 +34,22 @@
     return day % 2 === 0 ? 1 : 2;
   }
 
+  interface AppError {
+    kind: string;
+    details: string;
+  }
+
   async function generate() {
     let config = rota.toDTO();
     console.log(config);
 
     try {
       let schedule = await invoke<MonthlyScheduleDTO>("generate", { config });
-      console.log("replyFromGenerate:", schedule);
+      console.log(schedule);
       rota.solution = schedule;
     } catch (error) {
-      console.error("Error:", error);
+      const { kind, details } = error as AppError;
+      console.error(`[${kind}] - ${details}`);
     }
   }
 
@@ -53,7 +59,8 @@
     try {
       await invoke("export", { schedule });
     } catch (error) {
-      console.error("Error:", error);
+      const { kind, details } = error as AppError;
+      console.error(`[${kind}] - ${details}`);
     }
   }
 </script>