Migrate jqhtml slot syntax from <#name> to <Slot:name>

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/RSpade/Integrations/Jqhtml/Jqhtml_ManifestModule.php

@@ -218,8 +218,8 @@ class Jqhtml_ManifestModule extends ManifestModule_Abstract
     {
         $slots = [];
         
-        // Match <#slotname> syntax
-        preg_match_all('/<#(\w+)>/', $content, $matches);
+        // Match <Slot:slotname> syntax
+        preg_match_all('/<Slot:(\w+)>/', $content, $matches);
         
         foreach ($matches[1] as $slot) {
             if ($slot && !in_array($slot, $slots)) {