Update AlertReporter to include path hash size in flood messages

Modified the sendFlood method in AlertReporter to incorporate path hash size, ensuring compatibility with the repeater's configured path.hash.mode. This change enhances the handling of alert floods by accommodating different regional mesh configurations.

src/helpers/AlertReporter.cpp

@@ -214,15 +214,20 @@ bool AlertReporter::sendChannel(const char* text) {
   // broadcast channel messages. Falls back to plain (unscoped) flood when
   // no callbacks are wired or no scope is configured, matching the
   // pre-scoped behavior on builds without RegionMap.
+  //
+  // path_hash_size must honor the repeater's configured path.hash.mode (1, 2,
+  // or 3-byte hashes); the Mesh.h default of 1 would silently downgrade
+  // observers running on 2/3-byte regional meshes.
+  const uint8_t path_hash_size = (uint8_t)(_prefs->path_hash_mode + 1);
   TransportKey scope;
   bool have_scope = _callbacks && _callbacks->resolveAlertScope(scope) && !scope.isNull();
   if (have_scope) {
     uint16_t codes[2];
     codes[0] = scope.calcTransportCode(pkt);
     codes[1] = 0;
-    _mesh->sendFlood(pkt, codes);
+    _mesh->sendFlood(pkt, codes, 0, path_hash_size);
   } else {
-    _mesh->sendFlood(pkt);
+    _mesh->sendFlood(pkt, 0, path_hash_size);
   }
   ALERT_DEBUG_PRINTLN("sent: %s", text);
   return true;