Update Bun dependency and Vercel build setup

[dekacchi]

Summary

• remove the tracked bun.lock and ignore future Bun lockfiles while preserving bunfig.toml lockfile saving disabled
• refresh the direct tscircuit/circuit-json runtime dependencies used by the app
• add explicit Vercel Bun install/build config and give the production build enough Node heap for the updated viewer stack
• clean the existing Biome issues in src/App.tsx so checks pass

/claim #79

Checks

• bun install (confirmed no bun.lock or bun.lockb was created)
• bun run format
• bun x biome check package.json src tsconfig.json
• bun run build

Note: the first plain build hit the existing V8 heap limit after the dependency refresh, so the build script now sets NODE_OPTIONS=--max-old-space-size=4096; the updated bun run build passes locally.

[vercel]

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