Fix compilation error: Place microbit_ble_on_error in codal namespace

[Copilot]

microbit_ble_on_error is declared inside namespace codal in the header but defined in global namespace in the .cpp file, causing linker errors when MICROBIT_DMESG_LEVEL_DEBUG and DEVICE_BLE are both enabled.

Fix: Replace using namespace codal; with an explicit namespace block:

namespace codal
{

#if ( MICROBIT_DMESG_LEVEL >= MICROBIT_DMESG_LEVEL_DEBUG)
microbit_ble_ret_code_t microbit_ble_on_error( microbit_ble_ret_code_t err, const char *msg)
{
    // ...
}
#endif

} // namespace codal

using namespace allows access to symbols but doesn't place definitions into that namespace.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Specifying MICROBIT_DMESG_LEVEL_DEBUG and DEVICE_BLE causes compilation error</issue_title>
<issue_description>/source/bluetooth/MicroBitBLETypes.cpp does not place microbit_ble_on_error in the codal namespace.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Specifying MICROBIT_DMESG_LEVEL_DEBUG and DEVICE_BLE causes compilation error #513

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