feat(js-sdk): expose snapshot name parameter in createSnapshot

[Crunchyman-ralph]

Summary

Fixes #1249

The REST API supports an optional name field when creating snapshots, but the JS SDK was sending an empty body and not exposing the parameter. This PR:

• Adds SnapshotCreateOpts interface with optional name field
• Forwards the name in the POST request body to the API
• Exposes the names array from the API response in SnapshotInfo
• Exports SnapshotCreateOpts from the package entry point

Changes

• packages/js-sdk/src/sandbox/sandboxApi.ts — New SnapshotCreateOpts type, forward name in request body, return names in response
• packages/js-sdk/src/sandbox/index.ts — Update instance method signature to use SnapshotCreateOpts
• packages/js-sdk/src/index.ts — Export SnapshotCreateOpts

Usage

// Create a named snapshot
const snapshot = await sandbox.createSnapshot({ name: 'my-snapshot' })
console.log(snapshot.names) // ['team-slug/my-snapshot:default']

// Create sandbox from named snapshot
const sbx = await Sandbox.create('team-slug/my-snapshot')

Backwards compatible

• SnapshotCreateOpts extends SandboxApiOpts, so existing code using SandboxApiOpts still works
• name is optional — omitting it produces the same behavior as before
• names is a new field on SnapshotInfo — existing code accessing snapshotId is unaffected

[claude]

Claude Code Review

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