Item #4: centralize timezone, collapse the 16 pod branches to loops

- includes/db.php now defines PQS_TIMEZONE and sets it on include; the 9 files
  that hardcoded date_default_timezone_set('America/Chicago') drop the call
  (main pages already load db.php; display includes now require it).
- console.php: pod load and the 16 pod-checkbox lines collapsed into loops over
  a $pods array (fixed 16 kept - hardware max). Output unchanged.

Verified: timezone resolves to America/Chicago via the constant; console commit,
config update, and pod-checkbox rendering all correct; registration suite green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

includes/db.php

@@ -15,6 +15,11 @@ const PQS_DB_USER = 'pqs';
 const PQS_DB_PASS = 'pqs';
 const PQS_DB_NAME = 'pqs';
 
+// Single source of truth for the venue's timezone. Set on include so every
+// page that pulls in db.php gets it without repeating the call.
+const PQS_TIMEZONE = 'America/Chicago';
+date_default_timezone_set(PQS_TIMEZONE);
+
 /**
  * Shared mysqli connection, opened once per request.
  * mysqli is put into exception-reporting mode (the default since PHP 8.1) so