eventlog: store structured dicts; filter by user; clock: fix minute hand step

- eventlog() now stores {ts, host, level, service, message} dicts instead of strings
- WebSocket sends/broadcasts filter event log messages by the user's managed hosts
- live.html renders structured log entries with level-coloured spans
- Swiss railway clock minute hand now holds until second hand reaches 12, then steps

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

hbd/server/ws.py

@@ -85,11 +85,13 @@ async def handler(request):
             except Exception as e:
                 logger.error("Error sending initial hosts: %s", e)
 
-        # Send recent messages
+        # Send recent messages, filtered to hosts this user may see
         if data.msgs:
             try:
                 for m in data.msgs:
-                    await ws.send_str(json.dumps({"type": "message", "data": m}))
+                    host_name = m.get("host") if isinstance(m, dict) else None
+                    if not host_name or _user_can_see_host(user, host_name):
+                        await ws.send_str(json.dumps({"type": "message", "data": m}))
             except Exception as e:
                 logger.error("Error sending initial messages: %s", e)
 
@@ -128,6 +130,8 @@ def broadcast(typ: str, payload) -> bool:
     host_name: Optional[str] = None
     if typ in ("host", "plugin"):
         host_name = payload.get("raw_name") or payload.get("host") or payload.get("name")
+    elif typ == "message" and isinstance(payload, dict):
+        host_name = payload.get("host")
 
     jmsg = json.dumps({"type": typ, "data": payload})