Web UI: firmware table without build date, project and ESP-IDF

Only version, slots and state are shown; GET /api/ota still reports them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/index.html

@@ -544,7 +544,7 @@ async function otaInfo() {
   try {
     const o = await api('GET', '/api/ota');
     table($('fwinfo'), {
-      'Version': o.version, 'Project': o.project, 'Built': o.build_date, 'ESP-IDF': o.idf,
+      'Version': o.version,
       'Running slot': o.running, 'Previous slot': o.previous ? `${o.previous} (${o.previous_version ?? '?'})` : '–',
       'State': o.pending_verify ? {cls:'warn', text:'New firmware on trial – confirm or roll back'} : 'Confirmed'
     });