Initial commit: notification-elements-demo app

Interactive Angular 19 demo for @sda/notification-elements-ui with
6 sections: Bell & Feed, Notification Center, Inbox, Comments &
Threads, Mention Input, and Full-Featured layout. Includes mock
data, dark mode toggle, and real-time event log.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/tuf-js/dist/store.d.ts

@@ -0,0 +1,18 @@
+import { Metadata, Root, Snapshot, Targets, Timestamp } from '@tufjs/models';
+export declare class TrustedMetadataStore {
+    private trustedSet;
+    private referenceTime;
+    constructor(rootData: Buffer);
+    get root(): Metadata<Root>;
+    get timestamp(): Metadata<Timestamp> | undefined;
+    get snapshot(): Metadata<Snapshot> | undefined;
+    get targets(): Metadata<Targets> | undefined;
+    getRole(name: string): Metadata<Targets> | undefined;
+    updateRoot(bytesBuffer: Buffer): Metadata<Root>;
+    updateTimestamp(bytesBuffer: Buffer): Metadata<Timestamp>;
+    updateSnapshot(bytesBuffer: Buffer, trusted?: boolean): Metadata<Snapshot>;
+    updateDelegatedTargets(bytesBuffer: Buffer, roleName: string, delegatorName: string): void;
+    private loadTrustedRoot;
+    private checkFinalTimestamp;
+    private checkFinalSnapsnot;
+}