feat: Overview live-mode-only NRLs + split locations by type

Two Overview improvements for projects that mix vibration + sound:

- Live monitoring now includes only live-mode (connected) NRLs. connection_mode
  lives in the location's metadata JSON (default "connected"); offline/manual
  NRLs are excluded, and since the section hides when the list is empty, it
  disappears entirely when no NRL is a live SLM.
- The Overview location list is split into separate "Vibration Locations" and
  "NRLs" sections (driven by enabled modules) instead of one mixed list.
  Single-module projects still show just their one section. Live-chip repaint
  listener updated for the per-type list ids.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/routers/projects.py

@@ -1135,6 +1135,7 @@ async def get_project_live_stats(project_id: str, db: Session = Depends(get_db))
     import os
     import asyncio
     import httpx
+    import json as _json
 
     project = db.query(Project).filter_by(id=project_id).first()
     if not project:
@@ -1152,6 +1153,18 @@ async def get_project_live_stats(project_id: str, db: Session = Depends(get_db))
         .all()
     )
 
+    # Only connected/live-mode NRLs belong in live monitoring. connection_mode
+    # lives in location_metadata JSON (default "connected"); offline/manual NRLs
+    # are excluded. With none connected, the caller gets [] and hides the section.
+    def _is_connected(loc) -> bool:
+        try:
+            meta = _json.loads(loc.location_metadata or "{}")
+            return meta.get("connection_mode", "connected") != "offline"
+        except Exception:
+            return True
+
+    locations = [loc for loc in locations if _is_connected(loc)]
+
     # Active SLM unit per location (mirrors portal.active_unit_for_location).
     def _active_unit(loc_id: str):
         asg = (