fix(render): check disk space on write volumes

[miguel-heygen]

What

Make local render disk preflight validate the temp/intermediate volume and final output volume instead of the project source volume.

Why

A render with TMPDIR and --output on a roomy external drive was blocked because preflight only measured the low-space project volume, even though that volume was not receiving the large render artifacts.

How

• Add explicit disk paths to environment-check options.
• Check both os.tmpdir() and dirname(outputPath) for local renders.
• Include the checked path in low-space diagnostics.
• Add a regression test proving the requested render volume is measured.

Test plan

• bunx vitest run packages/cli/src/browser/preflight.test.ts (11 passed)
• bun run --filter @hyperframes/cli typecheck
• bunx oxfmt --check packages/cli/src/browser/preflight.ts packages/cli/src/browser/preflight.test.ts packages/cli/src/commands/render.ts
• bunx oxlint packages/cli/src/browser/preflight.ts packages/cli/src/browser/preflight.test.ts packages/cli/src/commands/render.ts