ArduPilot / MethodicConfigurator / 23027725382

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fix(component-templates): preserve pre-existing user templates on save

When saving a component template to the user templates file, existing
templates for other component types were silently overwritten. Now the
file is read before writing and merged so only the saved component's
entry is updated while all others are retained.

Also adds broader OSError/Exception handling to _load_system_templates
and _load_user_templates so read failures degrade gracefully to an empty
dict instead of propagating an unhandled exception.

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