Settings: add Home Pages visibility control

New "Home Pages" section in Settings lets the user toggle which pages
appear in the home screen carousel. Settings and Messages are always
shown; Clock, Recent, Radio, Bluetooth, Advert, GPS, Sensors, Tools
and Shutdown can each be hidden individually.

- NodePrefs: home_pages_mask uint16_t (bit per page, 0=all visible)
- HomeScreen: isPageVisible/navPage skip hidden pages; dots indicator
  counts only visible pages; enforces visible page on re-entry
- SettingsScreen: SECTION_HOME_PAGES with per-page ON/OFF toggles
- DataStore: persisted at offset 1598
- Default: all pages visible (0x01FF)

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

examples/companion_radio/DataStore.cpp

@@ -251,6 +251,9 @@ void DataStore::loadPrefsInt(const char *filename, NodePrefs& _prefs, double& no
           file.read((uint8_t *)&_prefs.ringtone_len, sizeof(_prefs.ringtone_len));          // 1564
           if (_prefs.ringtone_len > 32) _prefs.ringtone_len = 0;
           file.read((uint8_t *)_prefs.ringtone_notes, sizeof(_prefs.ringtone_notes));       // 1565
+          if (file.available()) {
+            file.read((uint8_t *)&_prefs.home_pages_mask, sizeof(_prefs.home_pages_mask)); // 1598
+          }
         }
       }
     }
@@ -308,6 +311,7 @@ void DataStore::savePrefs(const NodePrefs& _prefs, double node_lat, double node_
     file.write((uint8_t *)&_prefs.ringtone_bpm_idx, sizeof(_prefs.ringtone_bpm_idx));   // 1563
     file.write((uint8_t *)&_prefs.ringtone_len, sizeof(_prefs.ringtone_len));            // 1564
     file.write((uint8_t *)_prefs.ringtone_notes, sizeof(_prefs.ringtone_notes));         // 1565
+    file.write((uint8_t *)&_prefs.home_pages_mask, sizeof(_prefs.home_pages_mask));      // 1598
 
     file.close();
   }