fix(js-sdk): forward name param and expose names in createSnapshot

[FisherXZ]

Summary

Closes #1249.

Named snapshots let users write `Sandbox.create('team/my-snapshot')` instead of tracking raw template IDs like `abc123:default`. But passing `name` to `createSnapshot()` / `create_snapshot()` silently had no effect in both SDKs — the generated REST clients were already correct, but the hand-written wrapper layer never forwarded the value or surfaced the response field.

Three layers had the same gap in both SDKs:

Layer	Problem
Options type	No `name` field — callers had nowhere to pass it
Request body	`body: {}` / `PostSandboxesSandboxIDSnapshotsBody()` — `name` never included
`SnapshotInfo` return type	Missing `names` field — API response aliases silently dropped
Paginators	`listSnapshots` / `list_snapshots` had the same `names` omission

JS SDK changes (`packages/js-sdk/`):

• Added `SnapshotCreateOpts` interface with `name?: string`
• Added `names: string[]` to `SnapshotInfo`
• Forwarded `name` in `SandboxApi.createSnapshot()` using `!== undefined` guard (preserves `name: ''`)
• Fixed `SnapshotPaginator` to map `names`
• Exported `SnapshotCreateOpts` from the package index

Python SDK changes (`packages/python-sdk/`):

• Added `names: List[str]` to `SnapshotInfo` dataclass (`default_factory=list`)
• Added `name: Optional[str] = None` to `_cls_create_snapshot()` in both sync and async, forwarded as `name if name is not None else UNSET`
• Updated `create_snapshot()` overloads and implementations (sync + async)
• Fixed both `SnapshotPaginator.next_items()` to map `names`

Backwards compatible: `name` is optional everywhere, `names` defaults to `[]`.

Usage

JS:
```ts
const snap = await sandbox.createSnapshot({ name: 'my-snapshot' })
console.log(snap.snapshotId) // 'team-slug/my-snapshot:default'
console.log(snap.names) // ['team-slug/my-snapshot:default']

// Now usable by name instead of raw ID
const sbx = await Sandbox.create('team-slug/my-snapshot')
```

Python:
```python
snap = sandbox.create_snapshot(name='my-snapshot')
print(snap.snapshot_id) # 'team-slug/my-snapshot:default'
print(snap.names) # ['team-slug/my-snapshot:default']

sbx = Sandbox.create('team-slug/my-snapshot')
```

Test plan

• `pnpm run typecheck` — zero errors
• `pnpm run lint` — zero errors
• Python `make lint` (ruff check + ruff format) — all pass
• Changeset added: `patch` bump for `e2b` (JS) and `@e2b/python-sdk`
• Backwards compatible: `name` is optional, `names` defaults to `[]`
• Live integration: `createSnapshot({ name: ... })` returns alias in `names` — pending backend round-trip

🤖 Generated with Claude Code

[claude]

Claude Code Review

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[changeset-bot]

🦋 Changeset detected

Latest commit: 283703f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
e2b	Patch
@e2b/python-sdk	Patch

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[chatgpt-codex-connector]

Forward provided snapshot name without truthy filtering

Using ...(opts?.name && { name: opts.name }) drops the name field when callers pass an empty string, so createSnapshot({ name: "" }) silently behaves like an unnamed snapshot instead of letting the API validate/reject the explicit value. This makes client behavior inconsistent with user input and can create unintended unnamed snapshots; check for undefined instead of truthiness when deciding whether to include name.

Useful? React with 👍 / 👎.

[mishushakov]

we're working on it here
#1277