fix(lit): correct HTML attribute binding and state reflection in MultipleChoice [Issue #574]

[shantoislamdev]

Description

This PR fixes two critical bugs in the Lit MultipleChoice component that prevented proper HTML rendering and state reflection.

Issues Fixed:

1. Invalid HTML attribute binding: Options were rendered as <option valueContent> instead of <option value="valueContent">.
2. Missing state reflection: The dropdown did not display the currently selected value from the model.

Changes:

• Fixed option value binding to use standard HTML syntax: value="${option.value}".
• Added .value property binding to the <select> element to reflect the current selection from this.selections.

This brings the Lit implementation into alignment with the Angular renderer, which correctly handles these cases.

Fixes #574

Testing

• Tests pass: 23/23 ✅
• Verified HTML output renders correct value attributes
• Verified dropdown reflects model state

Checklist

• I have signed the Google CLA
• My code follows the project's style guidelines
• I have tested my changes locally

[gemini-code-assist]

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