Lower case cyrillic letters are treated as avatar, similar to emojis

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Steps to reproduce

1. Create a conversation
2. Type a name, started wih lower-case cyrillic letter
3. See result

Expected behaviour

Nothing should happen, actually. Same should be persistent for other alphabets apart from Latin (Greek, Armenian, e.t.c). Can't remember the realisation, but we could try to restrict usage only with emoji unicode range (or escape all alphabets) - see https://en.wikipedia.org/wiki/List_of_Unicode_characters for reference

Actual behaviour

Talk app

Talk app version: 17.0.0

Custom Signaling server configured: yes

Custom TURN server configured: no

Custom STUN server configured: no

No file or test is named. First reproduce the issue in the Talk app by creating a conversation and entering a name beginning with a lowercase Cyrillic letter, then trace the avatar-rendering path and its Unicode handling. Done means non-Latin letters no longer trigger avatar behavior, while the existing emoji behavior remains unchanged.