Overlay layer following DialHost, keyboardFocus None throughout, and an input
mask limited to the card so taps elsewhere reach the app underneath. Anchors to
the pointer hint above the touch point, clamped on screen.
Chip shows a character count, never a preview: the surface floats over the app
that owns the selection and the content may be a password, so it stays ambient
and discloses nothing. Read Aloud is live via Speech; agent and reference
actions render with the reason they cannot act yet.
Adds DeviceEvidence, reporting input to the state machine's existing
Request::Input with an intent label, so a new input surface is not another
isolated actor per DEVICE-STATE-MACHINE 1. Opt-in: nothing loads or watches
until Config.options.selection.enable.
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