feat(debug): add /debug page with NIP-46 encrypt→decrypt probes for nip04/nip44

src/App.tsx

@@ -17,6 +17,7 @@ import { useToast } from './hooks/useToast'
 import { useOnlineStatus } from './hooks/useOnlineStatus'
 import { RELAYS } from './config/relays'
 import { SkeletonThemeProvider } from './components/Skeletons'
+import Debug from './components/Debug'
 
 const DEFAULT_ARTICLE = import.meta.env.VITE_DEFAULT_ARTICLE_NADDR || 
   'naddr1qvzqqqr4gupzqmjxss3dld622uu8q25gywum9qtg4w4cv4064jmg20xsac2aam5nqqxnzd3cxqmrzv3exgmr2wfesgsmew'
@@ -168,6 +169,7 @@ function AppRoutes({
           />
         } 
       />
+      <Route path="/debug" element={<Debug />} />
       <Route path="/" element={<Navigate to={`/a/${DEFAULT_ARTICLE}`} replace />} />
     </Routes>
   )

src/components/Debug.tsx

@@ -0,0 +1,59 @@
+import React, { useMemo, useState } from 'react'
+import { Hooks } from 'applesauce-react'
+
+const Debug: React.FC = () => {
+  const activeAccount = Hooks.useActiveAccount()
+  const [result, setResult] = useState<string>('')
+  const [error, setError] = useState<string>('')
+
+  const signer = useMemo(() => (activeAccount as unknown as { signer?: unknown })?.signer, [activeAccount])
+  const hasNip04 = typeof (signer as { nip04?: { encrypt?: unknown; decrypt?: unknown } } | undefined)?.nip04?.encrypt === 'function'
+  const hasNip44 = typeof (signer as { nip44?: { encrypt?: unknown; decrypt?: unknown } } | undefined)?.nip44?.encrypt === 'function'
+  const pubkey = (activeAccount as unknown as { pubkey?: string })?.pubkey
+
+  const doRoundtrip = async (mode: 'nip04' | 'nip44') => {
+    setResult('')
+    setError('')
+    if (!signer || !pubkey) {
+      setError('No active signer/pubkey')
+      return
+    }
+    try {
+      const api = (signer as any)[mode]
+      if (!api || typeof api.encrypt !== 'function' || typeof api.decrypt !== 'function') {
+        setError(`${mode} not available on signer`)
+        return
+      }
+      const cipher = await api.encrypt(pubkey, `debug-${mode}-${Date.now()}`)
+      const plain = await api.decrypt(pubkey, cipher)
+      setResult(String(plain))
+    } catch (e) {
+      setError(e instanceof Error ? e.message : String(e))
+    }
+  }
+
+  return (
+    <div className="content-panel">
+      <h2>Debug / NIP-46 Echo</h2>
+      <div className="card">
+        <div className="card-body">
+          <div>Active pubkey: <code>{pubkey || 'none'}</code></div>
+          <div>Signer has nip04: <strong>{hasNip04 ? 'yes' : 'no'}</strong></div>
+          <div>Signer has nip44: <strong>{hasNip44 ? 'yes' : 'no'}</strong></div>
+          <div className="flex gap-2 mt-3">
+            <button className="btn btn-primary" onClick={() => doRoundtrip('nip44')} disabled={!hasNip44}>Probe nip44 encrypt→decrypt</button>
+            <button className="btn" onClick={() => doRoundtrip('nip04')} disabled={!hasNip04}>Probe nip04 encrypt→decrypt</button>
+          </div>
+          {result && (
+            <div className="alert alert-success mt-3">Plaintext: <code>{result}</code></div>
+          )}
+          {error && (
+            <div className="alert alert-error mt-3">Error: {error}</div>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+export default Debug