UX and architecture fixes: bulk-delete, template guard, statuses config

Bug fixes:
- bulk-delete action called undefined bulkDelete() — wired to the
  existing showBulkDeleteModal() so the confirmation modal actually shows

UX:
- Template loader now checks for existing title/description and asks
  for confirmation before overwriting user-typed content
- Visibility select shows a dynamic hint paragraph that updates when
  the user changes the selection (public/internal/confidential)

Architecture:
- TICKET_STATUSES added to config as single source of truth; all
  hardcoded ['Open','Pending','In Progress','Closed'] arrays in
  DashboardView now read from config; bulk-status modal in dashboard.js
  reads window.TICKET_STATUSES (set from PHP) with array fallback
- ASSET_VERSION now auto-computed from max mtime of dashboard/ticket
  CSS+JS files so browsers always pick up changes on deploy; manual
  override still available via ASSET_VERSION in .env
- Removed 10 dead standalone stat methods from StatsModel (getOpenTicketCount,
  getClosedTicketCount, getTicketsByPriority, etc.) — all superseded by
  the consolidated fetchAllStats() queries, never called externally

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/config.php

@@ -25,8 +25,23 @@ $GLOBALS['config'] = [
     'APP_SUBTITLE' => $envVars['APP_SUBTITLE'] ?? 'LotusGuild Infrastructure',
     'APP_VERSION'  => $envVars['APP_VERSION']  ?? '1.2',
 
-    // Asset cache-busting version string (bump when CSS/JS changes)
-    'ASSET_VERSION' => $envVars['ASSET_VERSION'] ?? '20260329',
+    // Asset cache-busting version — auto-computed from dashboard.js/css mtime so
+    // browsers always pick up changes on deploy. Override via ASSET_VERSION in .env.
+    'ASSET_VERSION' => (function() use ($envVars) {
+        if (!empty($envVars['ASSET_VERSION'])) return $envVars['ASSET_VERSION'];
+        $files = [
+            __DIR__ . '/../assets/css/dashboard.css',
+            __DIR__ . '/../assets/css/ticket.css',
+            __DIR__ . '/../assets/js/dashboard.js',
+            __DIR__ . '/../assets/js/ticket.js',
+        ];
+        $mtime = 0;
+        foreach ($files as $f) { if (file_exists($f)) $mtime = max($mtime, filemtime($f)); }
+        return $mtime ?: '20260329';
+    })(),
+
+    // Canonical ticket statuses — single source of truth used by views and JS
+    'TICKET_STATUSES' => ['Open', 'Pending', 'In Progress', 'Closed'],
 
     // Database settings
     'DB_HOST' => $envVars['DB_HOST'] ?? 'localhost',