FP-1.05: Efficient Bulk Sharing with "Select All" in a Folder or Space

[dj4oC]

As a user of the Messenger with the integrated ownCloud Infinite Scale File Picker,
I want a simple method to select all objects (both files and folders) within a folder or space at once,
So that I can efficiently share multiple items with my contacts without manually selecting them one by one.

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Acceptance Criteria:

1. "Select All" Option:

   • When I navigate to a folder or space in the ownCloud File Picker from the Messenger, I should see a "Select All" button or checkbox.

2. Unified Selection:

   • Upon clicking the "Select All" option, all objects (files and folders) within that specific folder or space should be marked as selected.

3. Visual Feedback:

   • The total number of objects selected should be displayed, providing clarity about how many items I'm about to share.
   • If I deselect any specific object after using "Select All," the count should update accordingly.

4. Sharing Interface:

   • With all desired objects selected, I should be able to proceed to share them with my Messenger contacts.
   • The recipients should either receive direct file access (if permissions allow) or obtain sharing links, as defined by my sharing preferences.

5. Revert Selection:

   • A clear option to "Deselect All" should be available in case I change my mind or want to start the selection process over.

6. Integration with Current Sharing Flow:

   • The "Select All" feature should seamlessly integrate with the existing sharing flow, allowing me to set permissions, add comments, or customize the share as I typically would.

cc @hodyroff @tbsbdr @JammingBen

[dj4oC]

Important: This requirement is a file-by-file in a queue handling and not related to any ZIP compressing / decompressing function

[dj4oC]

@AversaFTW
Please review