Fix datepicker functionality for Bootstrap 5 x-editable

- Updated Gruntfile to use npm bootstrap-datepicker instead of bundled version
- Fixed DPGlobal reference from bdatepicker to datepicker
- Changed mode from inline to popup to ensure date input type is used
- Fixed missing type assignment in editable element initialization
- Enhanced input2value function with fallback logic to extract dates from dates array
- Added comprehensive debugging and error handling
- Datepicker now properly opens, captures selections, and submits formatted dates

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/x-editable.iml" filepath="$PROJECT_DIR$/.idea/x-editable.iml" />
+    </modules>
+  </component>
+</project>