diag: show repeat counts in the mDNS query log; bump prop submodule

lib/services/debug_diagnostics.dart

@@ -183,9 +183,12 @@ class DebugDiagnostics {
     } else {
       for (final q in recentQueries) {
         final at = q.at.toIso8601String().split('T').last.split('.').first;
+        // Repeats are folded; the count keeps a continuous poller visible as
+        // one line instead of hiding that it fired hundreds of times.
+        final repeats = q.count > 1 ? ' ×${q.count}' : '';
         b.writeln(
           '    $at ${q.source}:${q.sourcePort} ${q.wantsUnicast ? 'QU' : 'QM'} '
-          '${q.questions.join(', ')} → ${q.reply}',
+          '${q.questions.join(', ')} → ${q.reply}$repeats',
         );
       }
     }

test/services/debug_diagnostics_test.dart

@@ -114,6 +114,40 @@ void main() {
       expect(text, contains('unicast+multicast'));
     });
 
+    test('marks a folded entry with its repeat count', () {
+      final text = withQueries([
+        MdnsQueryLogEntry(
+          at: DateTime(2026, 7, 30, 20, 32, 33),
+          source: '172.20.176.1',
+          sourcePort: 5353,
+          wantsUnicast: false,
+          questions: const ['PTR _oculusal_sp._tcp.local'],
+          answeredUnicast: false,
+          answeredMulticast: false,
+          count: 17,
+        ),
+      ]).toText();
+
+      expect(text, contains('×17'));
+      expect(text, contains('no answer'));
+    });
+
+    test('a single occurrence carries no count marker', () {
+      final text = withQueries([
+        MdnsQueryLogEntry(
+          at: DateTime(2026, 7, 30, 20, 32, 38),
+          source: '192.168.0.87',
+          sourcePort: 5353,
+          wantsUnicast: true,
+          questions: const ['PTR _openbikecontrol._tcp.local'],
+          answeredUnicast: true,
+          answeredMulticast: false,
+        ),
+      ]).toText();
+
+      expect(text, isNot(contains('×')));
+    });
+
     test('says so when nothing has queried us', () {
       // The decisive line for "the trainer app on this machine cannot see
       // BikeControl": if no query ever arrived, the problem is upstream of our