- Stock ticker customization with QWERTY keyboard input (up to 5 tickers)
- Index selection from scrollable multi-select list (up to 5 indices)
- Friendly index names displayed (S&P 500, Dow Jones, NASDAQ, etc.)
- CUSTOMIZE button in dashboard footer
- Config persisted to ESP32 Preferences
- REFRESHING... message shown when returning from customization
- Auto-refresh every 5 minutes