e1608: probe and docs for the network scan

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/ui_app.hpp

@@ -1873,6 +1873,12 @@ gboolean e1608_probe(gpointer user);
 gboolean e1608_probe_report(gpointer user);
 gboolean e1608_probe_reconnect(gpointer user);
 gboolean e1608_probe_resumed(gpointer user);
+/// The E-1608 form's "Scan network" row: presses Scan against the mock, then (phases `_fill`,
+/// `_rescan`) clicks a result to fill the address, "Use MAC" to fill the MAC, scans again and checks
+/// the results were replaced, not added to.
+gboolean e1608_scan_probe(gpointer user);
+gboolean e1608_scan_probe_fill(gpointer user);
+gboolean e1608_scan_probe_rescan(gpointer user);
 /// The flat UDP (MARTe2 UDPSender) source: the signal-list codec and a hand-computed decode, then,
 /// against `tools/mock_flatudp.py`, the stream, the value continuity, the wrong-size accounting and
 /// the capture button (`_report`, a second later). `_gap` starts a 100 ms poll that waits for the