feat(mobile): share to mechanism

[alextran1502]

Closes #2659

This PR adds "Share to" option to the mobile app. This feature helps users who want to quickly upload media to their Immich instance without saving the media to the gallery first.

ScreenRecording_01-10-2025.13-05-53_1-1.mov

Caveat

When initializing a share action, iOS will default to using the most compatible format, so the HEIC file will be converted to JPEG unless the user changes the settings from the native share sheet before sending the action to the Immich app.

TODO

• clear file cache

[mertalev]

I think it's important that it warns you if the images aren't the originals or the location metadata is stripped. You don't want people using this without realizing that Immich isn't getting the original.

Also, how does this handle live photos on iOS? Is the video transferred as well?