Function normalize

python/vibe-coding-ide/frontend/src/lib/sandbox.ts:20–21

(p: string | undefined | null)

  const lastData: Record<string, string> = { ...(previousData || {}) }

  const normalize = (p: string | undefined | null) =>
    (p || '').replace(/^\.?\//, '')

  // Apply deletions first
  for (const p of delta.deleted || []) {