v5.18.20

• add configurable ctrl and meta key prefixes for help bar (#572)
• fixes #522 - show chat history for whatsapp unarchived chats without restart
• fixes #556 - match accented and mixed-case characters in contact, chat and message search
• fixes #320 - auto-retry failed attachment downloads
• fixes #315 - support re-downloading whatsapp/signal attachments after profile tmp dir cleared
• fixes #560 - add support for receiving whatsapp video note messages
• fixes #551 - strip double-width padding for wide chars irrespective of emoji setting
• update doc with arch nchat-bin install instructions (#563)
• support user-writable install prefix in make.sh
• remove musl whatsapp/signal warnings for official patched-go builds
• update signalmeow to 20260807 from mautrix/signal@8c7333a
• update whatsmeow to 20260730 from tulir/whatsmeow@662ad1d
• update tdlib to 1.8.66 from tdlib/td@a9966eb
• update doc