fix: replace EncryptedSharedPreferences with plain MODE_PRIVATE for update survival

AGENTS.md

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+# Project_SylDa
+
+ESP32-S3-PICO-1-N8R8 (Atom S3R Voice), 2 relais, 2 touch sensors (JR223B), BLE, Android app USB OTG.
+
+## Hardware
+
+- **Board:** Atom S3R Voice (ESP32-S3-PICO-1-N8R8), 16MB OPI flash
+- **Pinnen:** G1=RELAY1, G2=RELAY2, G8+pullup=TOUCH1, G6+pullup=TOUCH2, G41=BUTTON (active low), G46=LED
+- **Touch:** DC3-24V Capacitieve Touch Schakelaar JR223B (GEEN TTP223). Minder C op punt A = gevoeliger = meer false triggers.
+- **BLE:** "AtomS3R-Relay", service `4fafc201-1fb5-459e-8fcc-c5c9c331914b`
+- **BLE cmds:** 0x00=relay1 OFF, 0x01=ON, 0x02=relay2 OFF, 0x03=ON, HMAC_PKT_SIZE=37 (1 cmd + 4 seq + 32 hmac)
+- **NVS:** namespace `hmac`, key `key` — HMAC key 32 bytes, NVS op 0x9000-0xDFFF (partitie tabel)
+
+## Workspace
+
+`/home/eddy/src/Project_SylDa/` — S3R firmware + Android app
+
+## Firmware — `src/main.cpp`
+
+- PlatformIO, `platform = espressif32@6.7.0`, board `esp32-s3-devkitc-1`
+- CDC USB serial (`ARDUINO_USB_CDC_ON_BOOT=1`), QIO OPI flash
+- Upload laptop: `pio run -t upload`, port `/dev/ttyACM0`, 115200 baud
+- NVS: namespace "hmac", key "key" (32 bytes HMAC)
+- BLE advertising "AtomS3R-Relay", HMAC-verified relay commands
+
+## Android app — `android/`
+
+- CDC key exchange (geen FTDI), 2 relay knoppen (touch-to-hold), byte commands
+- Key exchange: SettingsActivity via USB CDC (`UsbSerialTransport`)
+- Flash: EspFlasher via USB CDC, `eraseFlash()` VERWIJDERD (NVS blijft behouden)
+- Partitie layout flash: bootloader 0x0, partitions 0x8000, boot_app0 0xE000, firmware 0x10000
+- BLE scan: 30s timeout, auto-retry 3x, reconnect na disconnect
+- `deviceId` = UUID van ESP, `hmacKey` = HMAC key uit key exchange
+- Bestanden: `MainActivity.kt`, `SettingsActivity.kt`, `EspFlasher.kt`, `UsbSerialTransport.kt`, `PrefsHelper.kt`, `UsbUtils.kt`
+- Assets: `firmware/bootloader.bin`, `partitions.bin`, `boot_app0.bin`, `firmware.bin`
+
+## ADB — telefoon
+
+```
+adb connect 192.168.1.43:5555
+adb -s 192.168.1.43:5555 install -r app/build/outputs/apk/debug/app-debug.apk
+```