feat(cli): add column truncation controls (#1838)

- drop low-priority columns when tables exceed terminal width
- truncate optional columns to fit remaining width
- add --no-trunc flag to disable truncation
- compute column widths using unicode display width

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

easytier/Cargo.toml

@@ -160,6 +160,8 @@ x25519-dalek = "2.0"
 # for cli
 tabled = "0.16"
 humansize = "2.1.3"
+terminal_size = "0.4"
+unicode-width = "0.1"
 
 base64 = "0.22"