feat: Add implementation details and dependencies

- Added a detailed implementation status report (impl.md).
- Added the `@noble/hashes` dependency for Blake3 hashing.
- Updated package.json and pnpm-lock.yaml accordingly.
- Created a new component for Blake3 hashing demo.

sweb/package.json

@@ -31,6 +31,7 @@
     "@libp2p/webrtc": "^5.2.12",
     "@libp2p/websockets": "^9.2.10",
     "@libp2p/webtransport": "^5.0.40",
+    "@noble/hashes": "^1.8.0",
     "@tailwindcss/postcss": "^4.1.6",
     "@tailwindcss/vite": "^4.1.6",
     "class-variance-authority": "^0.7.1",