Add wifi_scanner app

examples/wifi_scanner/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+.config

examples/wifi_scanner/README.md

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+# WiFi Scanner App
+This is a WiFi scanner app for the device32 (ESP32-based board with OLED display). It scans and displays nearby WiFi access points with their details.
+
+## Requirements
+- device32 hardware
+- PlatformIO development environment
+- USB connection for flashing
+
+## Configuration
+Edit the constants in `src/config.h` to customize pin assignments if needed:
+
+- **OLED Display Pins**:
+  ```cpp
+  #define OLED_SDA 21
+  #define OLED_SCL 22
+  #define OLED_RST -1
+  #define OLED_ADDR 0x3C
+  ```
+
+- **Button Pin**:
+  ```cpp
+  #define BUTTON_PIN 0
+  ```
+
+## Setup
+1. Open this folder (`examples/wifi_scanner/`) in VSCode with PlatformIO installed.
+2. Connect your device32 via USB.
+3. Use PlatformIO to build and upload the project (`pio run --target upload`).
+
+## Usage
+- Power on the device—it will scan for nearby WiFi access points and display them.
+- The display shows a list of access points with their SSIDs.
+- Use the button for navigation:
+  - **Short press**: Move to next item in list or next detail field.
+  - **Long press**: Enter detail view for selected AP or return to list.
+- In list view, select "Rescan" at the bottom to refresh the AP list (shows "Scanning.." during scan).
+- In detail view, navigate through fields: SSID, BSSID, RSSI, Channel, Encryption.
+- Long SSIDs/BSSIDs scroll horizontally when selected.

examples/wifi_scanner/partitions.csv

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+# Name,   Type, SubType, Offset,  Size
+nvs,      data, nvs,     0x9000,  0x5000
+otadata,  data, ota,     0xe000,  0x2000
+ota_0,    app,  ota_0,   0x10000, 0x1C0000
+ota_1,    app,  ota_1,   0x1D0000, 0x1C0000

examples/wifi_scanner/platformio.ini

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+[env:seeed_xiao_esp32c3]
+platform = espressif32 @6.12.0
+board = seeed_xiao_esp32c3
+framework = arduino
+monitor_speed = 115200
+board_build.partitions = partitions.csv
+
+lib_archive = no
+lib_deps = 
+	adafruit/Adafruit SSD1306@^2.5.7
+	adafruit/Adafruit GFX Library@^1.11.3
+	bblanchon/ArduinoJson@^7.0.3

examples/wifi_scanner/src/config.h

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+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 64 // OLED display height, in pixels
+#define OLED_SDA_PIN 7 // D5
+#define OLED_SCL_PIN 6 // D4
+
+// button config
+#define BUTTON_PIN 5 // D3
+#define BUTTON_TAP_TIME 20
+
+// NTP server
+#define NTP_SERVER "pool.ntp.org"
+
+// globals
+#include <Adafruit_SSD1306.h>
+extern Adafruit_SSD1306 display;