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/src/App.tsx

@@ -61,6 +61,7 @@ const Forum = lazy(() => import('@/pages/Forum'));
 const ForumTopic = lazy(() => import('@/pages/ForumTopic'));
 const Telemetry = lazy(() => import('@/pages/Telemetry'));
 const Subdomains = lazy(() => import('@/pages/Subdomains'));
+const Messaging = lazy(() => import('@/pages/Messaging'));
 
 // Network pages
 const Mainnet = lazy(() => import('@/pages/networks/Mainnet'));
@@ -134,6 +135,7 @@ function App() {
                               <Route path="/forum/:id" element={<ForumTopic />} />
                               <Route path="/telemetry" element={<Telemetry />} />
                               <Route path="/subdomains" element={<Subdomains />} />
+                              <Route path="/message" element={<Messaging />} />
                               {/* Network pages */}
                               <Route path="/mainnet" element={<Mainnet />} />
                               <Route path="/staging" element={<Staging />} />