Remove alert delivery hint text from Ntfy sink section

Drop the "Every alert rule delivers here — see the Alerts panel to
define rules." hint paragraph from the Ntfy settings UI in NavMenu.tsx.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

webapp/src/components/NavMenu.tsx

@@ -485,7 +485,6 @@ function SettingsPanel({ panel }: { panel: ReturnType<typeof useSettingsPanel> }
           >
             {ntfyTesting ? 'Sending…' : 'Send test notification'}
           </button>
-          <p className="text-[11px] text-text-faint">Every alert rule delivers here — see the Alerts panel to define rules.</p>
         </div>
       </section>