The daemon's Up RPC previously always blocked in waitForUp (up to 50s)
until the engine connected. The UI does not need this — status updates
already flow through the SubscribeStatus stream.
Add bool async = 4 to UpRequest. When true the daemon starts
connectWithRetryRuns and returns immediately; the CLI path (async=false,
the default) is unchanged.
ProfileSwitcher.SwitchActive now sets Async:true so all three RPCs
(Status, Switch, Down, Up) return quickly. The background goroutine and
its associated race condition are removed entirely.
Both the tray and the React Profiles page previously had separate
switching logic: the tray applied a status-aware reconnect policy
(Down for error states, Up only when previously Connected/Connecting),
while the React page always called Switch + Up unconditionally with no
Down for LoginFailed/NeedsLogin/SessionExpired.
Introduce a single ProfileSwitcher service that encapsulates the full
reconnect policy. SwitchActive queries the current daemon status, calls
Switch, and launches Down/Up in a background goroutine so the caller
returns immediately after the Switch RPC completes. Both the tray and
the React Profiles page now delegate to this service.
Export the daemon status string constants (StatusConnected, etc.) from
the services package so tray.go no longer duplicates them as private
constants.
