feat: FTP server with Wi-Fi, NTP, LVGL UI — initial working build

- Rewrite main.cpp: SD_MMC mount, Wi-Fi from JSON, NTP Vienna, FTP server
- Add ui.h/ui.cpp: LVGL status screen (IP, FTP status, SD bar, time)
- Add build_framework_libs.py: dynamic ESP32 Core 3.x lib resolution
- Remove unused sensor libs (IMU, magnetometer, fuel gauge, charger)
- Add SimpleFTPServer + ArduinoJson dependencies
- Build succeeds: RAM 19.2%, Flash 4.2%

platformio.ini

@@ -8,8 +8,9 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 ; ==============================================================
-; BaseApp for Kode Dot (ESP32‑S3)
-; Builds Arduino firmware and flashes app only (keeps bootloader/partitions).
+; FTP Explorer for Kode Dot (ESP32‑S3)
+; FTP server serving the microSD card over Wi-Fi.
+; Flashes app only (keeps bootloader/partitions).
 ; ==============================================================
 [platformio]
 ; Default environment
@@ -24,7 +25,7 @@ board = kode_dot
 framework = arduino
 lib_compat_mode = off
 monitor_speed = 115200
-lib_ldf_mode = chain+
+lib_ldf_mode = deep+
 ; Serial monitor filters
 monitor_filters = time, esp32_exception_decoder
 ; Build flags
@@ -35,6 +36,8 @@ build_flags =
     -Wl,--wrap=esp_ota_mark_app_valid_cancel_rollback
     ; Enable LVGL simple include
     -DLV_CONF_INCLUDE_SIMPLE
+    ; FTP server storage type: SD_MMC
+    -DDEFAULT_STORAGE_TYPE_ESP32=STORAGE_SD_MMC
     ; Suppress deprecation warnings
     -Wno-deprecated-declarations
     ; Allow #warning without failing build
@@ -42,24 +45,20 @@ build_flags =
     ; Suppress narrowing conversion warnings
     -Wno-narrowing
 ; Pre-build scripts
-extra_scripts = pre:extra_scripts/auto_port.py, pre:extra_scripts/rename_bin.py
+extra_scripts = pre:extra_scripts/auto_port.py, pre:extra_scripts/rename_bin.py, pre:extra_scripts/build_framework_libs.py
 upload_protocol = custom
-upload_port = auto
-monitor_port = auto
+upload_port = COM10
+monitor_port = COM10
 upload_speed = 460800
 ; Flash app at 0x400000 (preserve bootloader/partitions)
 upload_command = esptool --chip esp32s3 --port ${UPLOAD_PORT} --baud ${UPLOAD_SPEED} write-flash --flash-freq 80m --flash-mode dio --flash-size 32MB 0x400000 "${BUILD_DIR}/${PROGNAME}.bin"
 
 ; Libraries
 lib_deps =
-  adafruit/Adafruit BusIO @ ^1.15.0
-  adafruit/Adafruit Unified Sensor @ ^1.1.4
   moononournation/GFX Library for Arduino @ ^1.6.0
   lvgl/lvgl @ ^8.3.9
   adafruit/Adafruit NeoPixel
   https://github.com/RobTillaart/TCA9555.git#0.4.3
-  adafruit/Adafruit LSM6DS @ ^4.7.4
-  adafruit/Adafruit LIS2MDL @ ^2.1.8
-  adafruit/Adafruit MAX1704X @ ^1.0.3
   https://github.com/bitbank2/bb_captouch.git
-  https://github.com/andhieSetyabudi/BQ25896.git
+  https://github.com/xreef/SimpleFTPServer.git
+  bblanchon/ArduinoJson @ ^7