Fix deprecated ESP-IDF API calls for v5.4 compatibility

[Copilot]

This PR fixes build warnings caused by deprecated API calls when using ESP-IDF v5.4. Two deprecated functions have been replaced with their modern equivalents:

Changes Made

1. Replace esp_log_buffer_hex() with ESP_LOG_BUFFER_HEX() macro

Location: main/main.c:299 in esp_bt_gap_cb() function

// Before (deprecated)
esp_log_buffer_hex(TAG, param->auth_cmpl.bda, ESP_BD_ADDR_LEN);

// After (modern API)
ESP_LOG_BUFFER_HEX(TAG, param->auth_cmpl.bda, ESP_BD_ADDR_LEN);

2. Replace esp_bt_dev_set_device_name() with esp_bt_gap_set_device_name()

Location: main/main.c:1359 in app_main() function

// Before (deprecated)
esp_bt_dev_set_device_name(device_name);

// After (recommended API)
esp_bt_gap_set_device_name(device_name);

Build Warnings Fixed

This resolves the following compiler warnings:

warning: 'esp_log_buffer_hex' is deprecated: Use 'ESP_LOG_BUFFER_HEX' instead [-Wdeprecated-declarations]
warning: 'esp_bt_dev_set_device_name' is deprecated: Please use esp_bt_gap_set_device_name or esp_ble_gap_set_device_name [-Wdeprecated-declarations]

Impact

• ✅ Functionality preserved: Both replacements maintain identical behavior
• ✅ Forward compatibility: Code now uses modern ESP-IDF v5.4+ APIs
• ✅ Minimal changes: Only 2 lines modified, no functional changes
• ✅ Build clean: Eliminates deprecation warnings in latest ESP-IDF

The changes are minimal and surgical, ensuring compatibility with newer ESP-IDF versions while maintaining all existing functionality.

Fixes #59.

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[albal]

LGTM