li3-ha: apply the same status-gate + current-scale fixes to the HA integration

parser.py is a verbatim port of li3/van-li3-battery and still had the old
"000000" string gate and raw int(parts[7]) current. Apply the identical
fixes (72487cf) so the native integration and the MQTT bridge agree:
- status gate and decode_status share one parsed-int helper (0 == OK in any
  representation; unparseable = unreliable)
- main-pack current parsed at its real 0.1 A scale

The 72487c MQTT/systemd/discovery/expire_after hardening intentionally does
not appear here: parser.py is protocol-only, and coordinator.py already uses
bleak_retry_connector + HA bluetooth discovery + native sensor availability
in place of those standalone concerns.

ha/custom_components/li3_battery/parser.py

@@ -31,10 +31,19 @@ STATUS_FLAGS = [
 ]
 
 
-def decode_status(hex_code):
+def status_value(status):
+    """Parse the raw hex status field to an int; None if unparseable.
+    Single source of truth for both the "is this OK" gate and the flag
+    decode, so the two can't disagree on e.g. "0" vs "000000"."""
     try:
-        value = int(hex_code, 16)
+        return int(status, 16)
     except (ValueError, TypeError):
+        return None
+
+
+def decode_status(hex_code):
+    value = status_value(hex_code)
+    if value is None:
         return hex_code
     active = [
         label for i, label in enumerate(STATUS_FLAGS)
@@ -61,7 +70,7 @@ def parse_line(line):
             "cell4": round(int(parts[4]) * 0.01, 2),
             "bms_temp_f": int(parts[5]),
             "batt_temp_f": int(parts[6]),
-            "current_a": int(parts[7]),
+            "current_a": round(int(parts[7]) * 0.1, 1),  # reported in 0.1A units
             "soc_pct": int(parts[8]),
             "status": parts[9] if len(parts) > 9 else "?",
         }
@@ -113,7 +122,11 @@ def build_state_payload(cs_reading, trace_fields):
     # ("&" line) fields come from a separate message and are published
     # regardless.
     status = cs_reading["status"]
-    if status != "000000":
+    # "OK" == integer zero in ANY representation. Gate on the parsed int (not
+    # the raw string) so "0"/"0000"/"000000" all agree with decode_status, and
+    # an unparseable status (e.g. "?") is treated as unreliable and suppressed.
+    value = status_value(status)
+    if value is None or value != 0:
         payload = {"status": status}
     else:
         payload = {