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.

Drivers/bmi270-module/include/bindings/bmi270.h

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/bindings/bindings.h>
+#include <drivers/bmi270.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+DEFINE_DEVICETREE(bmi270, struct Bmi270Config)
+
+#ifdef __cplusplus
+}
+#endif

Drivers/bmi270-module/include/bmi270_module.h

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/module.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern struct Module bmi270_module;
+
+#ifdef __cplusplus
+}
+#endif

Drivers/bmi270-module/include/drivers/bmi270.h

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <stdint.h>
+#include <tactility/error.h>
+
+struct Device;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Bmi270Config {
+    /** Address on bus */
+    uint8_t address;
+};
+
+struct Bmi270Data {
+    float ax, ay, az; // acceleration in g (±8g range)
+    float gx, gy, gz; // angular rate in °/s (±2000°/s range)
+};
+
+/**
+ * Read accelerometer and gyroscope data.
+ * @param[in] device bmi270 device
+ * @param[out] data Pointer to Bmi270Data structure to store the data
+ * @return ERROR_NONE on success
+ */
+error_t bmi270_read(struct Device* device, struct Bmi270Data* data);
+
+#ifdef __cplusplus
+}
+#endif