[itz4blitz]

Summary

• Call lock panel and Server Settings › Encryption lead with four Telegram-style emojis derived from the call code / safety number (digits stay under More / faintly under people).
• Shared protocol::safety_emojis so both surfaces stay in sync.
• Lock click: stop title-row mouse_down steal; shorten the reopen guard so dismissing then reopening the panel works.

Test plan

• Join a Tiny E2EE call, click the green lock — panel opens on first click; four emojis match the peer
• Expand More — server-sees copy and pairwise safety digits still there
• Server Settings › Encryption — people show emoji keys; mark verified / unmark still works
• cargo test -p protocol --lib safety_emojis
• cargo check -p tinyclient --features gui