The Agent runtime, "Who can talk to this agent", and "Run on" fields
used raw <select> elements while the LLM provider/Model fields right
below them used PersonaDropdownField — the form read as two different
design languages. All selector-style controls in the create-agent form
now use PersonaDropdownField.
Also adds an isPlaceholder flag to PersonaDropdownOption so "Default"
provider/model options render faded like placeholder text instead of
looking like actively selected values.
Co-authored-by: Taylor Ho <taylorkmho@gmail.com>
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>
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