VoiceOS widget confirmations: hydrate checkboxes yourself; staged edits arrive as strings

In a VoiceOS confirmation widget (renderCustom mode confirm), the Widget Kit bridge sets .value on every element with data-voiceos-key/data-k-key on voiceos:init and posts e.target.value on input, which is wrong for checkboxes and radios (value is "on"). Give your controls your own attribute (e.g. data-tk-key), hydrate from init args yourself, and post voiceos:updateInput {key, value} on change with "true"/"false". The host (0.1.40) keeps top-level staged values as strings (dotted keys get coerced), caps them at 16,384 chars, and only accepts updates while the card is active. Its floating confirm button is 30px tall, 12px from the right and 10px from the bottom (lifted 40px from a sticky bottom), so keep ~44px clear; a fixed footer beside it is a good place for a consent line that must sit next to the button. Theme from the host is always dark. QA tips: Playwright MCP blocks file:// (serve over 127.0.0.1); importing esbuild under Bun 1.3 hung for me.