v1.6.2: Fix announce bin8 encoding in Settings, deduplicate encodeAnnounceName

Apply bin8 fix to the duplicate announce encoding in LvSettingsScreen
(Send Announce action). Replace inline copy with shared function from
main.cpp. Follows up on PR #5.

src/ui/screens/LvSettingsScreen.cpp

@@ -450,14 +450,7 @@ void LvSettingsScreen::buildItems() {
         announceItem.formatter = [](int) { return String("[Enter]"); };
         announceItem.action = [this]() {
             if (_rns && _cfg) {
-                const String& name = _cfg->settings().displayName;
-                RNS::Bytes appData;
-                if (!name.isEmpty()) {
-                    size_t len = name.length(); if (len > 31) len = 31;
-                    uint8_t buf[2 + 31]; buf[0] = 0x91; buf[1] = 0xA0 | (uint8_t)len;
-                    memcpy(buf + 2, name.c_str(), len);
-                    appData = RNS::Bytes(buf, 2 + len);
-                }
+                RNS::Bytes appData = encodeAnnounceName(_cfg->settings().displayName);
                 _rns->announce(appData);
                 if (_ui) { _ui->lvStatusBar().flashAnnounce(); _ui->lvStatusBar().showToast("Announce sent!"); }
             } else {