M3 step 4: the LoRa Scanner App, Sniffer and Captures

The Sniffer lists packets newest first (time, RSSI, SNR, and for
Meshtastic the sender, receiver and hops), with the clear header and a
hex dump on Enter (Q96); `p` picks an EU868 preset, kept in Settings
(Q95). `c` starts a Capture: pcap with LoRaTap in /captures/lora, its own
Clean-up category, recorded by a small Service so it carries on with the
App closed (Q97, Q100). The Status Bar shows L while listening, bright on
each packet, and CAP while capturing (Q101). StorageService gains raw
appends for binary files. Debug Builds get `lora inject` to test all of
this with no transmitter in range: a Capture made on the device reads
back in TShark field for field.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

src/ui/widgets.cpp

@@ -49,6 +49,12 @@ void statusBar(Canvas& c, const StatusInfo& info) {
         case StatusInfo::Wifi::None: break;
     }
     if (info.tracking) right("REC", kWarning);
+    if (info.capturing) right("CAP", kWarning);
+    switch (info.radio) {  // Q101: muted while listening, bright for a moment on each packet
+        case StatusInfo::Radio::Listening: right("L", kMuted); break;
+        case StatusInfo::Radio::Packet: right("L", kAccent); break;
+        case StatusInfo::Radio::None: break;
+    }
     switch (info.gnss) {  // Q61: muted while searching, normal with a Fix, the count with a 3D Fix
         case StatusInfo::Gnss::Searching: right("G", kMuted); break;
         case StatusInfo::Gnss::TwoD: right("G", kText); break;