Walk every sandbox page in list commands

[davixcky]

Summary

• walk every sandbox cursor page for sandbox list
• reuse the same complete sandbox set for local override list
• keep table, JSON, and YAML output as the historical plain array
• preserve an empty list as [] rather than null
• reject an invalid hasMore response that omits nextCursor

Stack and dependencies

• base: job list: opt into the paginated ListJobs response #360, corrected to walk every Jobs page
• SDK: Regenerate client for sandbox pagination go-sdk#93
• API: signadot/signadot#7447

This PR intentionally does not update go.mod yet. It remains a draft until the SDK stack is merged and released, at which point the dependency can be bumped to the released version.

Test plan

• go test ./internal/sdkclient ./internal/command/jobs ./internal/command/sandbox ./internal/command/local/override
• tested against the exact clean go-sdk#93 commit via a temporary local replace that is not committed
• gofmt and git diff --check