fix: safelist calendar upcoming-event classes in purgecss config

Co-authored-by: HeyItsGilbert <615265+HeyItsGilbert@users.noreply.github.com>

Author: Copilot

purgecss.config.cjs

@@ -22,6 +22,9 @@ module.exports = {
       // These never appear in committed markup, so pin the whole status palette.
       'bg-blue-500', 'bg-green-500', 'bg-purple-500',
       'bg-orange-500', 'bg-red-500', 'bg-yellow-500',
+      // Calendar upcoming-events branch — only rendered when upcoming events
+      // exist; a build with no upcoming events would purge these otherwise.
+      'tracking-wide', 'leading-none', 'my-1', 'pr-6',
     ],
   },
   output: 'assets/css/tailwind.css',