Add `monospace` prop to Textarea component so font-mono is no longer
applied by default. Apply it explicitly to env variable editors, private
key fields, and shared variable forms where monospace is appropriate.
Use Alpine.js x-data/x-model to make the multiline toggle reactive
without a full Livewire round-trip. Add wire:key on the input/textarea
wrappers to force proper DOM replacement when switching modes.
