fix(chat): Preserve message text when sharing media from picker

[luflow]

Summary

• Fixes an issue where text typed in the chat input field was lost when selecting media to share
• The text is now transferred to the ShareConfirmationViewController as the media caption
• Matches the existing behavior for pasted media content

Problem

When a user had already typed text in the chat input field and then selected an image, video, or document to share via the picker, the text was being wiped/cleared instead of being used as the caption for the shared media.

Solution

Added calls to setChatMessage() in the picker delegate methods to transfer the existing text to the ShareConfirmationViewController before clearing the main input field. This mirrors the implementation that already exists in didPasteMediaContent().

Affected picker delegates:

• PHPickerViewControllerDelegate (photo library)
• UIImagePickerControllerDelegate (camera)
• UIDocumentPickerViewControllerDelegate (files)

If the user cancels the share, the text is restored to the chat input (this was already implemented in shareConfirmationViewControllerDidCancel).

Test plan

• Type some text in the chat input
• Tap the attachment button and select "Photo Library"
• Select an image
• Verify the text appears in the caption field of the share confirmation view
• Cancel the share and verify the text is restored to the chat input
• Repeat for camera and file picker

[Ivansss]

Really nice :)
Thanks for this PR!

[SystemKeeper]

🥳

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