In remote mode, checkUpdates()/applyUpdates() branch on connection.mode and
drive the existing updates overlay from the connected backend instead of the
local Electron git bridge:
- checkUpdates -> GET /api/hermes/update/check, mapped onto DesktopUpdateStatus
(behind, commits, supported=can_apply, message). The overlay renders the
commit list as 'what's changed' and shows guidance (not Install) when the
backend install can't self-apply (docker/nix).
- applyUpdates -> POST /api/hermes/update (the proven command-center path),
polling the action to completion and handling the expected mid-update
connection drop as the restart phase.
Local mode is unchanged. Adds checkHermesUpdate() to hermes.ts and a
BackendUpdateCheckResponse type.
64da518db4