Fix BLE client parameter passing and String comparison

[Copilot]

Addressed code review feedback for BLE client refactoring:

• Parameter type consistency: Pass String directly to getDeviceServiceInfo() instead of .c_str() to avoid unnecessary temporary object construction
• String comparison fix: Replace pointer equality check with content comparison when checking for duplicate device connections

// Before: compared pointer addresses
if (aDevName.c_str() == spinBLEClient.myBLEDevices[i].uniqueName.c_str())

// After: compares string contents
if (aDevName == String(spinBLEClient.myBLEDevices[i].uniqueName.c_str()))

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