feat(ui): refresh branding and account identity copying

Replace every active application icon asset with the new high-resolution artwork, including transparent PNG, complete Windows ICO sizes, and the documentation screenshot.

Turn populated username and email cells into non-selectable copy actions backed by validated native Electron clipboard IPC while keeping empty cells and row interactions unchanged.

tests/app-icon.test.ts

@@ -1,3 +1,4 @@
+import fs from "node:fs";
 import path from "node:path";
 import { describe, expect, it } from "vitest";
 import { resolveAppIconPath } from "../src/main/app-icon";
@@ -14,4 +15,20 @@ describe("application icon path", () => {
       path.join("C:\\repo", "assets", "app_icon.ico")
     );
   });
+
+  it("ships a high-resolution transparent PNG and complete Windows icon sizes", () => {
+    const png = fs.readFileSync(path.resolve("assets/app_icon.png"));
+    expect(png.subarray(0, 8)).toEqual(Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]));
+    expect(png.readUInt32BE(16)).toBeGreaterThanOrEqual(1024);
+    expect(png.readUInt32BE(20)).toBeGreaterThanOrEqual(1024);
+    expect([4, 6]).toContain(png[25]);
+
+    const ico = fs.readFileSync(path.resolve("assets/app_icon.ico"));
+    const frameCount = ico.readUInt16LE(4);
+    const sizes = Array.from({ length: frameCount }, (_, index) => {
+      const offset = 6 + index * 16;
+      return ico[offset] || 256;
+    });
+    expect(sizes).toEqual(expect.arrayContaining([16, 32, 48, 256]));
+  });
 });

tests/settings-view.test.tsx

@@ -301,6 +301,7 @@ function workspaceActions(overrides: Partial<AccountWorkspaceActions> = {}): Acc
     onToggleEnabled: () => {},
     onEdit: () => {},
     onContextMenu: () => {},
+    onCopyIdentity: () => {},
     onAdd: () => {},
     onRemoveSelected: () => {},
     onCheckAll: () => {},
@@ -740,6 +741,31 @@ describe("account workspace", () => {
     ]);
   });
 
+  it("copies only populated username and email cells without triggering the row", () => {
+    const copies: string[] = [];
+    const tree = AccountWorkspace({
+      model: workspaceModel(),
+      actions: workspaceActions({
+        onCopyIdentity: (label, value) => copies.push(`${label}:${value}`)
+      })
+    });
+    const buttons = findElements(tree, (element) => String(element.props.className || "").includes("settings-account-copy-button"));
+    const username = buttons.find((button) => button.props["aria-label"] === "Benutzername kopieren");
+    const email = buttons.find((button) => button.props["aria-label"] === "E-Mail kopieren");
+    let stopped = 0;
+
+    username?.props.onClick({ stopPropagation: () => { stopped += 1; } });
+    email?.props.onClick({ stopPropagation: () => { stopped += 1; } });
+    username?.props.onDoubleClick({ stopPropagation: () => { stopped += 1; } });
+
+    expect(buttons.some((button) => button.props.children === "—")).toBe(false);
+    expect(copies).toEqual([
+      "Benutzername:stored-user",
+      "E-Mail:verified@example.test"
+    ]);
+    expect(stopped).toBe(3);
+  });
+
   it("keeps overview and rules in the same workspace while only one panel is active", () => {
     const html = renderToStaticMarkup(<AccountWorkspace actions={workspaceActions()} model={workspaceModel()} />);
     expect(count(html, "class=\"settings-account-panel\"")).toBe(2);

tests/visual/mock-electron-api.ts

@@ -139,6 +139,7 @@ export function createVisualElectronApi(
       fixture.snapshot.settings.clipboardWatch = fixture.snapshot.clipboardActive;
       return fixture.snapshot.clipboardActive;
     },
+    writeClipboardText: async () => true,
     pickFolder: async () => "C:\\Visual\\Selected",
     pickContainers: async () => ["C:\\Visual\\Containers\\visual.dlc"],
     getSessionStats: async () => ({