fix(actors ls): do not crash when an Actor record has no stats

[l2ysho]

Note

apify actors ls crashed with Cannot read properties of undefined (reading 'totalBuilds'). The stats field is missing on some Actor records; the code only guarded item.actor. One-line guard plus a regression test.

What changed

• src/commands/actors/ls.ts — item.actor ? … → item.actor?.stats ? … for the Builds column.
• test/local/commands/actors-ls.test.ts — renders the table with an Actor record that has no stats. Fails on master with the exact error above.

Why it happened

• apify-client types Actor.stats as required (ActorStats), so TypeScript saw the access as safe. The API does not always send it.
• The Builds value is computed for both tables even though only the --my table shows that column, so plain apify actors ls hits it too.
• Existing e2e tests all pass --json, which returns before table rendering. The render path had no coverage.

Notes

• Not reproducible on every account — depends on which Actors are in your recent list.
• apify-client's ActorStats is inaccurate in two more ways: totalMetamorphs is required but absent from 3 of 5 public Actor responses I checked, and publicActorRunStats30Days, actorReviewCount, actorReviewRating, bookmarkCount are returned but undeclared. Worth a separate issue on apify-client-js.
• No install-size impact.

Reported by @mtrunkat in #cli.

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