fix: BatteryStatus-Mapping empirisch korrigiert

Byte-Zuordnung am echten HS80 verifiziert (Kabel ein/aus):
  0x01 = Charging, 0x02 = Discharging, 0x03 = Low, 0x04 = Full
Weicht vom ckb-next-Mapping ab. Verbose-Flag zeigt jetzt auch
Property-Queries für weitere Diagnose.

src/bragi/device.rs

@@ -14,6 +14,7 @@ use crate::hid;
 /// und setzt beim Drop automatisch in den Hardware-Modus zurück.
 pub struct BragiDevice {
     device: HidDevice,
+    verbose: bool,
 }
 
 impl BragiDevice {
@@ -32,13 +33,14 @@ impl BragiDevice {
         if verbose {
             eprintln!("[init] Gerät gefunden und geöffnet");
         }
-        let bragi = Self { device };
-        bragi.initialize(verbose)?;
+        let bragi = Self { device, verbose };
+        bragi.initialize()?;
         Ok(bragi)
     }
 
     /// Vollständige Bragi-Handshake-Sequenz.
-    fn initialize(&self, verbose: bool) -> Result<()> {
+    fn initialize(&self) -> Result<()> {
+        let verbose = self.verbose;
         // Phase 1: Receiver initialisieren
         // Wake-Up: Firmware-Version lesen
         let packet = protocol::build_get_packet(ENDPOINT_RECEIVER, Property::AppFirmware.id());
@@ -118,6 +120,10 @@ impl BragiDevice {
     fn get_headset_property(&self, property: Property) -> Result<BragiResponse> {
         let packet = protocol::build_get_packet(ENDPOINT_HEADSET, property.id());
         let raw = hid::send_recv(&self.device, &packet)?;
+        if self.verbose {
+            let hex: Vec<String> = raw.iter().take(10).map(|b| format!("{b:02X}")).collect();
+            eprintln!("[query] GET 0x{:02X} → {}", property.id(), hex.join(" "));
+        }
         protocol::parse_response(&raw)
     }
 

src/bragi/properties.rs

@@ -37,13 +37,18 @@ pub enum BatteryStatus {
 }
 
 impl BatteryStatus {
+    /// Konvertiert das Status-Byte in einen BatteryStatus.
+    ///
+    /// Mapping empirisch ermittelt am HS80 RGB Wireless (2026-03-27):
+    ///   0x00 = Offline, 0x01 = Charging, 0x02 = Discharging,
+    ///   0x03 = Discharging (Low), 0x04 = FullyCharged
     pub fn from_byte(value: u8) -> Self {
         match value {
             0x00 => Self::Offline,
-            0x01 => Self::Discharging,
-            0x02 => Self::Low,
-            0x03 | 0x04 => Self::Charging,
-            0x05 => Self::FullyCharged,
+            0x01 => Self::Charging,
+            0x02 => Self::Discharging,
+            0x03 => Self::Low,
+            0x04 => Self::FullyCharged,
             other => Self::Unknown(other),
         }
     }