Add editable device display name, persist it across profile save/load

DeviceInfo.name existed but was hardcoded per device type and never
operator-editable. Adds a Display Name field to Add Device and makes
the Info-tab Name field in the device config dialog editable, and
threads the name through get_save_config()/ProfileManager.apply() so
a custom name survives a .labdaq save/reload instead of reverting to
the type default. Name is applied post-construction rather than as a
constructor kwarg, since no device factory declares a "name" param.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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