Add runtime UV protection toggle and treat near-zero sense as external power.

Per-pod NVS enable (default off) via UART/ESP-NOW/dashboard, and skip UV latch when LiPo ADC reads ~0 mV so USB/external supply still boots.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/dashboard.go

@@ -20,6 +20,8 @@ type MasterView struct {
 	RunningPartition string          `json:"running_partition,omitempty"`
 	Deadzone         uint32          `json:"deadzone,omitempty"`
 	TapConfig        *TapConfigView  `json:"tap_config,omitempty"`
+	UvProtection     *bool           `json:"uv_protection,omitempty"`
+	UvLatched        bool            `json:"uv_latched,omitempty"`
 	Lipo1            lipoReadingJSON `json:"lipo1"`
 	Lipo2            lipoReadingJSON `json:"lipo2"`
 	BatteryAgeMs     uint32          `json:"battery_age_ms,omitempty"`
@@ -58,6 +60,7 @@ type ClientView struct {
 	TapNotifySingle bool            `json:"tap_notify_single"`
 	TapNotifyDouble bool            `json:"tap_notify_double"`
 	TapNotifyTriple bool            `json:"tap_notify_triple"`
+	UvProtection    bool            `json:"uv_protection"`
 	LastTap         string          `json:"last_tap,omitempty"`
 	LastTapAt       int64           `json:"last_tap_at,omitempty"`
 	Lipo1           lipoReadingJSON `json:"lipo1"`
@@ -700,6 +703,11 @@ func pollDashboard(link *managedSerial, portName string, last *DashboardState, s
 	if tc, err := readTapConfigPoll(link, 0); err == nil {
 		st.Master.TapConfig = tc
 	}
+	if uv, err := readBatteryUvPoll(link, 0); err == nil {
+		en := uv.GetEnabled()
+		st.Master.UvProtection = &en
+		st.Master.UvLatched = uv.GetLatched()
+	}
 
 	clients, err := link.listClientsPoll()
 	if err != nil {
@@ -726,6 +734,7 @@ func pollDashboard(link *managedSerial, portName string, last *DashboardState, s
 			TapNotifySingle: c.GetTapNotifySingle(),
 			TapNotifyDouble: c.GetTapNotifyDouble(),
 			TapNotifyTriple: c.GetTapNotifyTriple(),
+			UvProtection:    c.GetUvProtectionEnabled(),
 		}
 		st.Clients = append(st.Clients, cv)
 	}
@@ -928,6 +937,20 @@ func tapConfigViewFromPB(r *pb.TapConfigResponse) *TapConfigView {
 	}
 }
 
+func readBatteryUvPoll(link *managedSerial, clientID uint32) (*pb.BatteryUvResponse, error) {
+	r, err := link.BatteryUvPoll(&pb.BatteryUvRequest{
+		Write:    false,
+		ClientId: clientID,
+	})
+	if err != nil {
+		return nil, err
+	}
+	if !r.GetSuccess() {
+		return nil, fmt.Errorf("battery uv read failed for client %d", clientID)
+	}
+	return r, nil
+}
+
 func readTapConfigPoll(link *managedSerial, clientID uint32) (*TapConfigView, error) {
 	r, err := link.TapConfigPoll(&pb.TapConfigRequest{
 		Write:    false,