Replace the static startup-only item list with a real-time event feed:
- InitGui.py: remove the startup list_items() call that showed
'(Unable to connect)' when not yet authenticated; show a simple
'(Waiting for connection...)' placeholder instead
- silo_commands.py (submodule): maintain an in-memory event list
prepended by SSE events, seeded with 10 recent items on first
connect, with relative timestamps refreshed every 60s
The panel now shows live activity ('F01-0001 updated · just now')
instead of requiring expensive full re-fetches on every SSE event.
e0e8e22cd2