AIT-622: Image Studio leave-wait Library requestId deep-link (owner-safe)

[CharlesHarry7]

Summary

• Wire Image Studio leaveWaitingKeepBackground through existing imageLibraryHref / libraryWorkbenchHandoffHref so owners with durable private + UUID requestId open the exact Library job instead of the plain list.
• Lab / missing / non-private stay plain /library (never invent ?job=).
• Extend library-workbench-deeplink-smoke + generate-wait-honesty-regression to source-lock leave-wait handoff honesty.
• Scope: app/image/page.tsx leave path only (no parallel Image residual chrome thrash).

Context

• Prior: AIT-576 residual chrome deep-link (AIT-576: Image Studio residual Library requestId deep-link (owner-safe) #550), AIT-558 Batch leave-wait (AIT-558: BatchStudio/Seller Pack Library requestId deep-link (owner-safe) #536), AIT-554 Image busy-leave (AIT-578 / AIT-554: Image Studio busy-leave — non-destructive keep-generating exit #532)
• Residual: leave-wait still did router.push("/library") while residual chrome already used imageLibraryHref

Closes AIT-622

Test plan

• node scripts/library-workbench-deeplink-smoke.mjs
• node scripts/generate-wait-honesty-regression.mjs
• npm run lint
• npx tsc --noEmit
• npm run build

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