fix(renderer): simplify sidebar and reset page errors

tests/unit/error-boundary.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from "vitest";
+import { ErrorBoundary } from "../../src/renderer/components/ui";
+
+describe("ErrorBoundary", () => {
+  it("resets a captured page error when the section changes", () => {
+    const error = new Error("boom");
+    const failedState = {
+      hasError: true,
+      error,
+      resetKey: "runs",
+    };
+
+    expect(ErrorBoundary.getDerivedStateFromProps({ children: null, resetKey: "tasks" }, failedState)).toEqual({
+      hasError: false,
+      error: null,
+      resetKey: "tasks",
+    });
+  });
+});