Feat/studio override outcomes UI

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• Show whether scenario overrides were applied or skipped.
• Display failure reasons for skipped overrides.
• Preserve sparse scenario-relative slots during playback.
• Surface override outcomes in Studio notifications and playback state.

Requires LimeChain/surfpool#6.

Greptile Summary

The PR adds scenario override outcome reporting and sparse-slot playback while coordinating playback cleanup across editor replacements.

• Preserves scenario-relative slot heights and stable override identifiers.
• Displays applied and skipped override outcomes through playback state and notifications.
• Serializes reset and clock-resume cleanup before replacement playback starts.
• Synchronizes absolute slot changes with the compact slot widget.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains from the previous playback-cleanup findings.

The current generation checks prevent unmounted starts from registering, phase-aware cleanup avoids resetting Surfnet before playback state exists, and failed cleanup remains required before replacement playback can proceed.

Important Files Changed

Filename	Overview
apps/studio/src/components/svm/scenario-editor.tsx	Adds sparse-slot playback, outcome presentation, generation-based cancellation, and phase-aware cleanup across editor unmounts.
apps/studio/src/lib/scenarios-playback.ts	Introduces response, slot, override-identity, and globally serialized cleanup helpers used by scenario playback.
apps/studio/src/components/svm/scenarios-bento.tsx	Keys the editor by scenario ID so scenario changes remount it and invoke coordinated cleanup.
packages/svm/src/compact-slot-widget.tsx	Handles absolute-slot updates and filters stale WebSocket notifications after time travel or reset.
apps/studio/src/app/layout.tsx	Mounts the global Sonner toaster used by playback notifications.

Sequence Diagram

sequenceDiagram
  participant Editor as Scenario editor
  participant Cleanup as Playback cleanup coordinator
  participant Surfnet
  participant Slot as Compact slot widget
  Editor->>Cleanup: Wait for prior cleanup
  Cleanup-->>Editor: Cleanup succeeded
  Editor->>Surfnet: Pause clock
  Editor->>Surfnet: Register scenario
  Surfnet-->>Editor: Slot and override outcomes
  Editor->>Slot: Dispatch absolute slot change
  Editor->>Surfnet: Time travel to sparse next slot
  Surfnet-->>Editor: Slot and override outcomes
  Editor->>Cleanup: Reset network and resume clock

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_{Reviews (10): Last reviewed commit: "fix(studio): clean up cancelled playback..." | Re-trigger Greptile}

Context used (3)

• Knowledge Base — Studio scenarios and AI workflows
• Knowledge Base — Studio application shell and configuration
• Knowledge Base — SVM faucet and compact slot widgets

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