Refactor Form Submission and Field Management Logic

- Simplified the constructor in StoreFormSubmissionJob for improved readability.
- Enhanced the storeFile method to handle null and empty values more robustly, ensuring better validation of file names.
- Updated StorageFileNameParser to return null for empty file names, improving error handling.
- Refactored OpenForm.vue to optimize form initialization and prevent unnecessary reinitializations, enhancing performance.
- Introduced new methods for managing field groups and preventing recursive updates in OpenForm.vue, improving the overall user experience.
- Enhanced FormEditorSidebar.vue to utilize Pinia store for better state management and clarity.
- Improved FormFieldEdit.vue to prevent page jumps during field editing, ensuring a smoother user experience.
- Added new getters in working_form.js for better page management and navigation within forms.

These changes aim to enhance the maintainability and performance of the form handling logic, providing a more efficient and user-friendly experience.

client/components/open/forms/fields/FormFieldEdit.vue

@@ -124,6 +124,14 @@ const field = computed(() => {
     : null
 })
 
+// Only set the page once when the component is mounted
+// This prevents page jumps when editing field properties
+onMounted(() => {
+  if (selectedFieldIndex.value !== null) {
+    workingFormStore.setPageForField(selectedFieldIndex.value)
+  }
+})
+
 const isBlockField = computed(() => {
   return field.value && field.value.type.startsWith('nf')
 })
@@ -147,6 +155,8 @@ function removeBlock() {
 }
 
 function closeSidebar() {
+  // Explicitly clear the selected field index to prevent issues with subsequent block additions
+  workingFormStore.selectedFieldIndex = null
   workingFormStore.closeEditFieldSidebar()
 }