New kernel drivers, filesystem API, and more (#513)

* **New Features**
  * BMI270 6-axis IMU driver added; new unified filesystem abstraction for mounted filesystems.
  * Public Wi‑Fi API surface (no implementation yet)
  * SDMMC driver added (kernel drive$)
  * expanded GPIO interrupt/callback support
* **Improvements**
  * M5Stack Tab5: revamped GPIO/power initialization and IMU integration.
  * LVGL updates including device fontSize configuration.
  * Updated all code related to SD card device/fs handling
  * Rename LilyGO T-HMI S3 to LilyGO T-HMI
* **Bug Fixes**
  * Simplified and consolidated SD card handling and mount discovery.

Devices/lilygo-thmi/Source/devices/Power.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <string>
+#include <esp_adc_cal.h>
+#include <driver/gpio.h>
+#include <ChargeFromVoltage.h>
+#include <Tactility/hal/power/PowerDevice.h>
+
+constexpr auto THMI_POWEREN_GPIO = GPIO_NUM_10;
+constexpr auto THMI_POWERON_GPIO = GPIO_NUM_14;
+
+using tt::hal::power::PowerDevice;
+
+class Power final : public PowerDevice {
+
+    ChargeFromVoltage chargeFromAdcVoltage = ChargeFromVoltage(3.3f, 4.2f);
+    esp_adc_cal_characteristics_t adcCharacteristics;
+    bool initialized = false;
+    bool calibrated = false;
+
+    bool adcInitCalibration();
+    uint32_t adcReadValue() const;
+
+    bool ensureInitialized();
+
+public:
+
+    std::string getName() const override { return "T-HMI Power"; }
+    std::string getDescription() const override { return "Power measurement via ADC"; }
+
+    bool supportsMetric(MetricType type) const override;
+    bool getMetric(MetricType type, MetricData& data) override;
+};