channels list returns max ~50 results, no way to list all joined chats

[kfastov]

Problem: channels list returns ~50 channels from cache. After sync --once, still 50. The DB has 1358 channels, but the CLI doesn't expose them all.

channels list --query does Telegram global search which doesn't return private supergroups you're a member of.

Repro:

tgcli channels list --json | jq length   # → 50
# meanwhile DB has 1358 channels

Expected: A way to list/search all joined dialogs, including private supergroups.