feat(web): add PEZMessage on-chain E2E encrypted messaging UI

- x25519 ECDH + XChaCha20-Poly1305 encryption via @noble libs
- Key derivation from wallet signRaw, private key held in memory only
- Messaging pallet integration (registerEncryptionKey, sendMessage, inbox)
- Inbox polling every 12s, auto-decrypt when key unlocked
- ComposeDialog with recipient key validation and 512-byte limit
- Settings moved from grid to nav bar gear icon, PEZMessage takes its slot
- i18n translations for all 6 languages (en, tr, kmr, ckb, ar, fa)

web/package.json

@@ -21,6 +21,9 @@
   },
   "dependencies": {
     "@hookform/resolvers": "^3.9.0",
+    "@noble/ciphers": "^2.1.1",
+    "@noble/curves": "^2.0.1",
+    "@noble/hashes": "^2.0.1",
     "@pezkuwi/api": "^16.5.36",
     "@pezkuwi/extension-dapp": "^0.62.20",
     "@pezkuwi/keyring": "^14.0.25",