station: Default device type to "unknown" and propagate DHCP hostname

GuessDeviceType silently returned "mobile" for any device whose hostname
or MAC OUI didn't match a known pattern, so the UI labelled every
unidentified device as a phone. Default to "unknown" instead and broaden
hostname matching (pixel/galaxy, thinkpad, imac/-pc, QEMU OUI).

The hostapd backend was also dropping DHCP hostnames on the floor: the
correlator only forwarded MAC->IP, and convertStation hard-coded the
hostname to "". Replace UpdateIPMapping with UpdateLeaseInfo that carries
both maps so hostnames flow through to ConnectedDevice.Name.

Frontend gains a "Sans nom" fallback when no hostname is available and
French labels for the device-type badge.

cmd/repeater/static/app.js

@@ -401,13 +401,17 @@ function displayDevices(devices) {
         const deviceCard = document.createElement('div');
         deviceCard.className = 'device-card';
 
+        const displayName = device.name && device.name.trim() !== ''
+            ? device.name
+            : 'Sans nom';
+
         deviceCard.innerHTML = `
             ${getDeviceIcon(device.type)}
-            <div class="device-name">${escapeHtml(device.name)}</div>
-            <div class="device-type">${device.type}</div>
+            <div class="device-name">${escapeHtml(displayName)}</div>
+            <div class="device-type">${escapeHtml(formatDeviceType(device.type))}</div>
             <div class="device-info">
-                <div>${device.ip}</div>
-                <div style="font-size: 0.75rem;">${device.mac}</div>
+                <div>${escapeHtml(device.ip || '—')}</div>
+                <div style="font-size: 0.75rem;">${escapeHtml(device.mac)}</div>
             </div>
         `;
 
@@ -415,6 +419,17 @@ function displayDevices(devices) {
     });
 }
 
+function formatDeviceType(type) {
+    const labels = {
+        mobile: 'Mobile',
+        tablet: 'Tablette',
+        laptop: 'Portable',
+        desktop: 'Ordinateur',
+        unknown: 'Inconnu'
+    };
+    return labels[type] || labels.unknown;
+}
+
 function addLogEntry(log) {
     const logContainer = document.getElementById('logContainer');
 

internal/station/backend/types.go

@@ -87,19 +87,26 @@ type BackendConfig struct {
 	HostapdInterface string // Hostapd interface name for DBus
 }
 
-// GuessDeviceType attempts to guess device type from hostname and MAC address
+// GuessDeviceType attempts to guess device type from hostname and MAC address.
+// Returns "unknown" when no signal is strong enough — the frontend renders that
+// as a neutral icon rather than mislabeling unknown devices as "mobile".
 func GuessDeviceType(hostname, mac string) string {
 	hostname = strings.ToLower(hostname)
 
-	if strings.Contains(hostname, "iphone") || strings.Contains(hostname, "android") {
+	if strings.Contains(hostname, "iphone") || strings.Contains(hostname, "android") ||
+		strings.Contains(hostname, "pixel") || strings.Contains(hostname, "galaxy") {
 		return "mobile"
 	} else if strings.Contains(hostname, "ipad") || strings.Contains(hostname, "tablet") {
 		return "tablet"
-	} else if strings.Contains(hostname, "macbook") || strings.Contains(hostname, "laptop") {
+	} else if strings.Contains(hostname, "macbook") || strings.Contains(hostname, "laptop") ||
+		strings.Contains(hostname, "thinkpad") {
 		return "laptop"
+	} else if strings.Contains(hostname, "imac") || strings.Contains(hostname, "desktop") ||
+		strings.Contains(hostname, "-pc") {
+		return "desktop"
 	}
 
-	// Guess by MAC prefix (OUI)
+	// Guess by MAC prefix (OUI) — VM hypervisor MACs are almost always laptops
 	if len(mac) >= 8 {
 		macPrefix := strings.ToUpper(mac[:8])
 		switch macPrefix {
@@ -107,8 +114,8 @@ func GuessDeviceType(hostname, mac string) string {
 			return "laptop"
 		case "08:00:27": // VirtualBox
 			return "laptop"
-		default:
-			return "mobile"
+		case "52:54:00": // QEMU/KVM
+			return "laptop"
 		}
 	}
 

internal/station/hostapd/backend.go

@@ -27,17 +27,19 @@ type Backend struct {
 	stopCh   chan struct{}
 	stopOnce sync.Once
 
-	// IP correlation - will be populated by periodic DHCP lease correlation
-	ipByMAC map[string]string // MAC -> IP mapping
+	// IP / hostname correlation - populated by periodic DHCP lease correlation
+	ipByMAC       map[string]string // MAC -> IP mapping
+	hostnameByMAC map[string]string // MAC -> hostname mapping
 }
 
 // NewBackend creates a new hostapd backend
 func NewBackend() *Backend {
 	return &Backend{
-		stations:   make(map[string]*HostapdStation),
-		ipByMAC:    make(map[string]string),
-		hostapdCLI: "hostapd_cli",
-		stopCh:     make(chan struct{}),
+		stations:      make(map[string]*HostapdStation),
+		ipByMAC:       make(map[string]string),
+		hostnameByMAC: make(map[string]string),
+		hostapdCLI:    "hostapd_cli",
+		stopCh:        make(chan struct{}),
 	}
 }
 
@@ -298,12 +300,8 @@ func (b *Backend) parseAllStaOutput(output string) map[string]*HostapdStation {
 
 // convertStation converts HostapdStation to backend.Station
 func (b *Backend) convertStation(mac string, hs *HostapdStation) backend.Station {
-	// Get IP address if available from correlation
 	ip := b.ipByMAC[mac]
-
-	// Attempt hostname resolution if we have an IP
-	hostname := ""
-	// TODO: Could do reverse DNS lookup here if needed
+	hostname := b.hostnameByMAC[mac]
 
 	return backend.Station{
 		MAC:         mac,
@@ -317,27 +315,34 @@ func (b *Backend) convertStation(mac string, hs *HostapdStation) backend.Station
 	}
 }
 
-// UpdateIPMapping updates the MAC -> IP mapping from external source (e.g., DHCP)
-// This should be called periodically to correlate hostapd stations with IP addresses
-func (b *Backend) UpdateIPMapping(macToIP map[string]string) {
+// UpdateLeaseInfo updates MAC -> IP and MAC -> hostname mappings from an
+// external source (e.g., DHCP lease file). Called periodically by the
+// correlator. An empty hostname leaves the existing one in place — DHCP
+// leases sometimes drop the hostname between renewals.
+func (b *Backend) UpdateLeaseInfo(macToIP, macToHostname map[string]string) {
 	b.mu.Lock()
 	defer b.mu.Unlock()
 
-	// Track which stations got IP updates
 	updated := make(map[string]bool)
 
 	for mac, ip := range macToIP {
-		if oldIP, exists := b.ipByMAC[mac]; exists && oldIP != ip {
-			// IP changed
-			updated[mac] = true
-		} else if !exists {
-			// New IP mapping
+		if oldIP, exists := b.ipByMAC[mac]; !exists || oldIP != ip {
 			updated[mac] = true
 		}
 		b.ipByMAC[mac] = ip
 	}
 
-	// Trigger update callbacks for stations that got new/changed IPs
+	for mac, hostname := range macToHostname {
+		if hostname == "" {
+			continue
+		}
+		if oldName, exists := b.hostnameByMAC[mac]; !exists || oldName != hostname {
+			updated[mac] = true
+		}
+		b.hostnameByMAC[mac] = hostname
+	}
+
+	// Trigger update callbacks for stations whose info changed
 	for mac := range updated {
 		if station, exists := b.stations[mac]; exists {
 			if cb := b.callbacks.OnStationUpdated; cb != nil {

internal/station/hostapd/correlation.go

@@ -81,14 +81,20 @@ func (dc *DHCPCorrelator) correlate() {
 		return
 	}
 
-	// Build MAC -> IP mapping
+	// Build MAC -> IP and MAC -> hostname mappings. Hostnames live in the
+	// dhcpd "client-hostname" field and let us label devices instead of
+	// falling back to bare MAC addresses.
 	macToIP := make(map[string]string)
+	macToHostname := make(map[string]string)
 	for _, lease := range leases {
-		macToIP[lease.MAC] = lease.IP
+		mac := strings.ToLower(lease.MAC)
+		macToIP[mac] = lease.IP
+		if lease.Hostname != "" {
+			macToHostname[mac] = lease.Hostname
+		}
 	}
 
-	// Update backend with IP mappings
-	dc.backend.UpdateIPMapping(macToIP)
+	dc.backend.UpdateLeaseInfo(macToIP, macToHostname)
 }
 
 // parseDHCPLeases reads and parses DHCP lease file