Problem: `:CP login` and `:CP logout` only worked as `:CP <platform>
login`. Users with an active platform or in a registered buffer had to
type the platform name redundantly.
Solution: Parse standalone `login`/`logout`/`signup` as action commands
with `requires_context = true`, resolving the platform from state (or
auto-restoring from the current buffer). Add `vim.cmd.redraw()` after
auto-restore so the screen updates before any prompt. Add `login`/
`logout` to top-level completion when a platform is active.
Barrett Ruth
693d3bf172
