fix: show clean state label without code suffix

The state showed "Battery on-grid (16)" — the (16) suffix is noise. Drop
the code from _state_label output and remove the "State 16" fallback in
the frontend so the label is always the clean human-readable name.

- _state_label now returns just the label (e.g. "Battery On-grid"), with
  "Unknown (code)" only for genuinely unmapped values.
- renderMain no longer falls back to "State N"; if state_label is missing
  it shows the raw number only.

Author: jmewing

api/__init__.py

@@ -119,7 +119,7 @@ def _state_label(value) -> str:
     label = _STATE_LABELS.get(code)
     if label is None:
         return f"Unknown ({code})"
-    return f"{label} ({code})"
+    return label
 
 
 def _fault_label(value) -> str:

api/static/index.html

@@ -521,7 +521,7 @@ <h3>Timer Schedule</h3>
 
   const state = val(r,'state',0);
   const stateLabel = val(r,'state_label', null);
-  setText('sa-inv-state', stateLabel || ('State '+state));
+  setText('sa-inv-state', stateLabel !== null && stateLabel !== undefined ? stateLabel : state);
   const invTemp = val(r,'temp_inverter');
   setText('sa-inv-temp', invTemp !== undefined ? fmt(invTemp) + ' °C' : null);