feat: add private chat info card

Show a compact Telegram-like counterpart card inside private chats.

Reuse existing chat data for avatar, username, and status instead of adding new profile fetches.

Display contact and blocked badges when the relationship state is already known.

android/app/src/main/res/values/strings.xml

@@ -142,6 +142,8 @@
     <string name="chat_unknown_user_banner_subtitle">You can add this person to contacts or block them right from the chat.</string>
     <string name="chat_unknown_user_add_contact">Add contact</string>
     <string name="chat_unknown_user_block">Block user</string>
+    <string name="chat_private_info_contact">Contact</string>
+    <string name="chat_private_info_blocked">Blocked</string>
     <string name="chat_type_group">group</string>
     <string name="chat_type_channel">channel</string>
     <string name="chat_info_tab_media">Media</string>