Merge Workstream F: unlocks/inventory UI + sigil designer + listening tool

frontend/src/pages/SeancePage.tsx

@@ -256,6 +256,10 @@ function SeanceSession({ username }: { username: string }) {
             {t('nav.codex')}
           </Link>
 
+          <Link to="/inventory" className="seance-codex-link">
+            {t('nav.inventory', { defaultValue: 'inventory' })}
+          </Link>
+
           <span className="seance-user" title={username}>
             {username}
           </span>
@@ -469,7 +473,11 @@ function WirePanel() {
 
 function EvpPanel() {
   const { sendAnomaly } = useSeance()
+  const { user } = useAuth()
   const { t } = useTranslation()
+  // "listening_tool" unlock (GET /auth/me's `unlocks`) lowers the EVP
+  // detector's threshold so fainter deviations register — see lib/evp.ts.
+  const hasListeningTool = user?.unlocks?.includes('listening_tool') ?? false
   const [listening, setListening] = useState(false)
   const [pending, setPending] = useState(false)
   const [denied, setDenied] = useState(false)
@@ -531,7 +539,7 @@ function EvpPanel() {
             setBandDb(Number.isFinite(peak) ? peak : null)
           }
         },
-      })
+      }, { hasListeningTool })
       if (listenerRef.current === listener) setListening(true)
     } catch {
       if (listenerRef.current === listener) listenerRef.current = null