feat: deliver the redesigned desktop workspace

Rebuild downloads, link collection, settings, history, and statistics around a responsive desktop shell with compact account and queue tables, contextual navigation, persistent update affordances, unified overlays, and accessible keyboard interactions.

Add safe history-folder reveal IPC, responsive 2560/1920/1366/1120 coverage, deterministic visual fixtures, focused component regressions, and release-tree exclusions for internal working files. Bump the public application version to 2.0.13.

tests/toast.test.tsx

@@ -0,0 +1,17 @@
+import { renderToStaticMarkup } from "react-dom/server";
+import { describe, expect, it } from "vitest";
+import { Toast } from "../src/renderer/ui/Toast";
+
+describe("Toast", () => {
+  it("announces the current single toast politely", () => {
+    const html = renderToStaticMarkup(<Toast message="Einstellungen gespeichert" />);
+
+    expect(html).toContain("role=\"status\"");
+    expect(html).toContain("aria-live=\"polite\"");
+    expect(html).toContain("Einstellungen gespeichert");
+  });
+
+  it("renders nothing without a message", () => {
+    expect(renderToStaticMarkup(<Toast message="" />)).toBe("");
+  });
+});