feat: v2 event_count for Light/Door/Move/Reed; unified naming

dashboard/sensit_decoder.py

@@ -98,18 +98,14 @@ def _decode_v2(b0: int, b1: int, b2: int, b3: int) -> dict:
         result["temperature_c"] = round((temp_raw - 200) / 8, 2)
         result["reed_switch"] = bool((b2 >> 6) & 0x01)
 
-    # Byte 3 depends on mode
-    if mode == 0:  # Button — software version
+    # Byte 3 depends on mode (per v2 spec)
+    if mode == 0:  # Button — software version (fw major.minor)
         result["fw_major"] = (b3 >> 4) & 0x0F
         result["fw_minor"] = b3 & 0x0F
-    elif mode == 1:  # Temperature — humidity
+    elif mode == 1:  # Temperature — humidity percentage
         result["humidity_pct"] = round(b3 * 0.5, 1)
-    elif mode == 4:  # Move — event count / status
-        result["move_events"] = b3
-    elif mode == 5:  # Reed Switch — event count
-        result["reed_events"] = b3
-    else:
-        result["byte3_raw"] = b3
+    else:  # Light, Door, Move, Reed Switch — number of alerts / events
+        result["event_count"] = b3
     return result