iOS support for "Recognize email guests"

[nickvergessen]

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• Follow up to https://github.com/nextcloud/spreed/issues/6098

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🍏 iOS

• [x] Show email icon when no name is set
• [x] Show ? when "default Guest" name is used (?) Asked in https://github.com/nextcloud/spreed/issues/13606#issuecomment-2430258945
• [x] Show first letter on gray background like for normal guests when a name is set
• [x] Check mentions (note their guest ID is longer than the old guests actor id and therefore potentially the regex needs adjusting) Fixed in https://github.com/nextcloud/talk-ios/pull/1850
• [x] Check autocomplete Works fine, but shows always email avatar (see third task)
• [x] Check call view Works fine, but shows always email avatar (see third task)

[SystemKeeper]

• Show the invited email address on the "Guest name screen"

• Should we hide the "have an account, login here?" message from that screen?

I assume both are not relevant, as we can’t login as a guest via talk-iOS?

[nickvergessen]

yeah sorry, just copy-pasted from frontend