Squashed commit of the following:

commit 579f0878e5240dc17db69be1e0b0c0f5af7ef9fe
Author: Arno Kaimbacher <arno.kaimbacher@geosphere.at>
Date:   Tue Jun 9 09:25:44 2026 +0200

    feat: Refactor error handling in Dataset Edit form and improve validation messages

    - Updated error handling in the Dataset Edit form to use a centralized formatError function for displaying validation messages.
    - Enhanced user feedback by ensuring that error messages are displayed consistently across various fields.
    - Modified the validation rule for arrayContainsTypes to provide clearer error messages for missing main and translated titles/abstracts.
    - Introduced a new ValidationService to manage manual construction of validation errors.
    - Updated Vite configuration to streamline asset loading and improve performance.
    - Adjusted Inertia setup to utilize dynamic imports for page-specific assets.
    - Cleaned up unnecessary comments and code in various files for better readability.

commit 5efddc2a58c0e164fef585cc7344c06155dbc2c1
Author: Arno Kaimbacher <arno.kaimbacher@geosphere.at>
Date:   Mon Jan 12 17:02:47 2026 +0100

    feat: add dataset change detection and form submission composables

    - Implemented `useDatasetChangeDetection` for tracking unsaved changes in dataset forms, including comparisons for licenses, basic properties, files, coverage, and more.
    - Added `useDatasetFormSubmission` for handling dataset form submissions with validation, success/error handling, and auto-save functionality.

app/services/validation_service.ts

@@ -0,0 +1,54 @@
+import app from '@adonisjs/core/services/app'
+import { errors } from '@vinejs/vine'
+
+/**
+ * The ValidationService handles manual construction of validation errors
+ * that are compatible with the VanillaErrorReporter and AdonisJS Session.
+ */
+export class ValidationService {
+  /**
+   * Builds a validation error in the array-of-objects format without throwing it.
+   * Use this when you need the error object itself, e.g. multipart.abort(error).
+   */
+  make(field: string, message: string, rule: string = 'manual') {
+    return new errors.E_VALIDATION_ERROR([
+      {
+        field,
+        message,
+        rule,
+      },
+    ])
+  }
+
+  /**
+   * Throws a manual validation error in the array-of-objects format
+   * which prevents the ".reduce is not a function" error in the session.
+   */
+  throw(field: string, message: string, rule: string = 'manual') {
+    throw this.make(field, message, rule)
+  }
+
+  /**
+   * Throws multiple manual validation errors at once.
+   */
+  throwMany(errorObjects: Array<{ field: string; message: string; rule?: string }>) {
+    throw new errors.E_VALIDATION_ERROR(
+      errorObjects.map((err) => ({
+        field: err.field,
+        message: err.message,
+        rule: err.rule || 'manual',
+      }))
+    )
+  }
+}
+
+/**
+ * Initialize and export the singleton instance
+ */
+let validation: ValidationService
+
+await app.booted(async () => {
+  validation = await app.container.make(ValidationService)
+})
+
+export { validation as default }