Image upload field: no multi-upload, not clickable

[rezamirsadeghi96]

On the Sitebuilder editor page, the image upload field behaves inconsistently when handling multiple files.

Observed behavior

• Dragging multiple images into the upload field shows a successful upload message.
• However, only one image is actually uploaded.
• The upload field is not clickable and no file picker opens.
• Upload only works via drag and drop.

Expected behavior

• The upload field should support multiple image uploads when multiple files are dragged in.
• The field should be clickable and open the native file picker as a fallback.
• Upload feedback should accurately reflect what was uploaded.

Why this matters

• Uploading images one by one significantly slows down content creation.

• Non-clickable upload fields reduce accessibility and usability.

• Supporting multi-upload would significantly improve editor efficiency and UX.

Environment

• Page: Sitebuilder Editor

[manuelkiessling]

Fixed with #89.