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.

src/shared/preload-api.ts

@@ -62,6 +62,7 @@ export interface ElectronApi {
   exportQueue: () => Promise<{ saved: boolean }>;
   importQueue: (json: string) => Promise<{ addedPackages: number; addedLinks: number }>;
   toggleClipboard: () => Promise<boolean>;
+  writeClipboardText: (text: string) => Promise<boolean>;
   pickFolder: () => Promise<string | null>;
   pickContainers: () => Promise<string[]>;
   getSessionStats: () => Promise<SessionStats>;