fix(Typeahead): propagate generic type through CreateStaticSourceOptions

[cixzhang]

Thread the generic T from createStaticSource into CreateStaticSourceOptions so the keywords callback receives the fully-typed item instead of XDSSearchableItem with auxiliaryData: unknown.

Before

const source = createStaticSource(items, {
  keywords: (item) => {
    item.auxiliaryData.category; // TS18046 — auxiliaryData is 'unknown'
  },
});

After

const source = createStaticSource(items, {
  keywords: (item) => {
    item.auxiliaryData.category; // ✓ fully typed
  },
});

The default type parameter (= XDSSearchableItem) preserves backward compatibility — existing code that uses CreateStaticSourceOptions without a type argument continues to work unchanged.

Closes #1979

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Project	Deployment	Actions	Updated (UTC)
xds-sandbox	Ready	Preview, Comment	May 3, 2026 6:54pm

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