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/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 () => ({