Adds an inline "Update (pull latest images & recreate)" action to each
row of the stacks table, next to start/stop/restart/edit — for both the
local host and remote agents. Wires the existing updateImages action and
the agent "update" lifecycle action through StacksTable's new onUpdate prop.
Also bumps backend/version.py to 0.35.0 so it tracks the frontend version
again (it had drifted to 0.33.0 while package.json moved to 0.34.x).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
