Motivation

• Investigated drawing failures on iPhones and verified stream readers use getReader() + await reader.read() loops rather than for await...of, so async-iteration-on-streams is not the cause.
• Found unconditional setPointerCapture / releasePointerCapture calls on the new-sketch canvas which can throw on some iOS Safari touch pointers and break input handling.

Description

• Added safelySetPointerCapture and safelyReleasePointerCapture helpers that feature-detect and wrap setPointerCapture/releasePointerCapture in try/catch to avoid exceptions.
• Replaced direct e.currentTarget.setPointerCapture(e.pointerId) and e.currentTarget.releasePointerCapture(e.pointerId) calls with the safe wrappers in src/app/new/page.tsx.
• Left stream consumption unchanged, continuing to use ReadableStream.getReader() + reader.read() loops which are Safari-compatible.

Testing

• Ran pnpm -s eslint src/app/new/page.tsx which passed.
• Ran pnpm -s tsc --noEmit which passed.

Codex Task