fix sandbox deletion

[kcoopermiller]

--label delete now properly respects --only-mine and also added name-based deletion (cli only)

---

Note

Introduces safer, more flexible sandbox deletion flows and clearer output.

• Adds --name/-n to delete sandboxes by exact name, with preview table and confirmations when multiple match
• Applies --only-mine/--all-users consistently to --all, --label, and --name paths; validates user_id when filtering
• Replaces ad-hoc loops with _bulk_delete_sandboxes (batched by BULK_DELETE_BATCH_SIZE=100) and _print_bulk_delete_results for unified progress and summaries
• Changes --label deletion to client-side fetch/filter + confirm + batched delete instead of server-side bulk by labels
• Improves validation/errors: mutual exclusivity of inputs and clearer confirmation messages

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