A new device ships with Public and nothing else, so changing devices
meant adding every channel again by hand: each private key pasted, each
# name typed, each send scope and mute set again. The Channels page now
has an "Export and import" section. Export writes every channel to one
TOML file, in slot order, with its key, its send scope and its mute.
Import reads such a file and adds its channels to the device.
Import never removes a channel. The channels of the file go first, in
the file's order, and whatever else the device holds follows them. A
channel with no free slot is reported, not forced in. Before anything is
written, a dialog shows the plan (what is added into which slot, what
moves) and ends on "Nothing is removed from the device." The slots are
read again in full before the plan is made, because a probe cut short
makes an occupied slot look free.
The file uses the same [[channels]] table as config backup, so a config
backup imports too. A # channel carries no secret, since the device
derives its key from the name. A private channel carries its key, so the
file is written readable by its owner only, and the export says how many
private keys it holds.
On the command line, `channels export FILE` writes the file and prints
its path, and `channels import --file FILE [--dry-run]` prints the
device's layout after the import, one row per channel with add, move,
keep or skip. `channels import INDEX URL` still imports a single link.
Refs: #25
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>