Addresses "no way to read window/door contacts": ShellyNormalizer never emitted
contact entities, so the Fenster page was empty for real hardware.
- Map the Shelly `input` component (digital reed on a Shelly input) → contact
entity {open, position}; analog/count inputs are skipped.
- Dedicated `contact`/`window` components → 3-state {open, position} with
closed/open/**tilted** support (`gekippt`) when the sensor reports it.
- entity-state renders the 3-state pill (closed=neutral, tilted=warning,
open=offline); DE/EN labels. `contact` is a primary auto-onboarding type, so a
window sensor on an input onboards itself.
ShellyNormalizerTest (5 cases). Live-verified: input state true/false →
contact open/closed on an auto-onboarded device. Suite 51 green, 12/12 clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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