Fix stateIcon passing wrong arguments to binarySensorIcon

[Copilot]

binarySensorIcon has signature (state?: string, stateObj?: HassEntity), but stateIcon was calling it as binarySensorIcon(hassEntity) — passing the full entity as the state string. This meant device_class was never resolved, so all binary sensors fell through to the default icon.

Changes

• src/state_icon.ts: Wrap binarySensorIcon in the domainIcons map with an adapter that correctly destructures the entity:

  // Before
  binary_sensor: binarySensorIcon,
  
  // After
  binary_sensor: (stateObj: HassEntity) => binarySensorIcon(stateObj.state, stateObj),

• test/icons.test.ts: Add stateIcon regression tests for binary_sensor with a device_class in both on/off states.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Broken "stateIcon" function</issue_title>
<issue_description>Six months ago, changes were made to the project (specifically in this commit), they broke the "stateIcon" function, so the second argument is not passed for binary_sensor and the device type is now not determined

JonahKr pls fix your code</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Broken "stateIcon" function #66

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[iantrich]

cc @JonahKr