Add Fastmail email and calendar, multi-account neomutt

- mbsync: add Fastmail IMAP channel (rbw for credentials)
- msmtp: add Fastmail SMTP account
- neomutt: add fastmail account file, F2/F3 account switching macros
- vdirsyncer + khal: Fastmail CalDAV calendar sync
- zshrc: restore calsync alias

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

laptop/.config/msmtp/config

@@ -1,14 +1,22 @@
 defaults
-auth	xoauth2
-tls	on
-tls_trust_file	/etc/ssl/certs/ca-bundle.crt
-logfile		~/.local/share/msmtp/msmtp.log
+tls            on
+tls_trust_file /etc/ssl/certs/ca-bundle.crt
+logfile        ~/.local/share/msmtp/msmtp.log
 
-account		outlook
-host		smtp.office365.com
-port		587
-tls_starttls	on
-user		robharbaugh@outlook.com
-passwordeval	python3 /usr/share/neomutt/oauth2/mutt_oauth2.py ~/.config/neomutt/outlook.tokens --decryption-pipe 'gpg --decrypt'
+account        outlook
+auth           xoauth2
+host           smtp.office365.com
+port           587
+tls_starttls   on
+user           robharbaugh@outlook.com
+passwordeval   python3 /usr/share/neomutt/oauth2/mutt_oauth2.py ~/.config/neomutt/outlook.tokens --decryption-pipe 'gpg --decrypt'
 
-account default : outlook
+account        fastmail
+auth           plain
+host           smtp.fastmail.com
+port           587
+tls_starttls   on
+user           rob@rharbaugh.com
+passwordeval   rbw get fastmail-app-password
+
+account default : outlook