Add Float16Array type preservation to normalize function

[Copilot]

The normalize function in VectorUtils.ts was missing an instanceof check for Float16Array, causing it to fall through to the default Float32Array return, losing type information.

Changes:

• Added Float16Array instanceof check with runtime availability guard (typeof Float16Array !== "undefined")
• Returns new Float16Array(normalized) when input is Float16Array
• Positioned check after Float32Array, before Int8Array checks

Implementation:

// @ts-ignore - Float16Array is not yet in TypeScript's lib but is supported in browsers
if (typeof Float16Array !== "undefined" && vector instanceof Float16Array) {
  // @ts-ignore
  return new Float16Array(normalized);
}

The runtime check ensures compatibility with environments where Float16Array is unavailable (Node.js < v22) while preserving type information where it exists.

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[sroussey]

remove the @ts-ignore -- this has been fixed in recent versions