Fix frontend CI build break by aligning SimulationFrame type with visualizer usage

[Copilot]

The frontend GitHub Actions job failed during TypeScript build because CanvasVisualizer reads frame.comparing, but SimulationFrame did not define that field. This PR updates the shared frame type so the existing visualization logic type-checks correctly.

• Type contract alignment

  • Added optional comparing?: number[] to SimulationFrame in frontend/src/models/types.ts.
  • Keeps compatibility with frames that only provide highlight while supporting code paths already using comparing.

• Why this unblocks CI

  • Removes TS2339 in CanvasVisualizer.tsx without changing runtime behavior.

export type SimulationFrame = {
  frame: number;
  array: number[];
  highlight: number[];
  comparing?: number[]; // added
  // ...
};

[vercel]

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Project	Deployment	Actions	Updated (UTC)
algorithm-race-visualizer	Ready	Preview	Aug 2, 2026 8:38am