fix(ui): close paste admission edge cases

[waleedlatif1]

Summary

• enforce exact projected-result limits for text files and rich Markdown pastes
• scope structured clipboard exemptions to compatible inputs and preserve long prompt references
• align text-file paste admission with the existing 50 MiB save boundary

Type of Change

• Bug fix

Testing

• 35 focused paste tests
• full monorepo type-check, lint, registry validation, and audit suite

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Aug 27, 2026 5:15am

[greptile-apps]

Greptile Summary

The PR closes paste-admission edge cases by projecting exact text-editor and rich-Markdown results while preserving structured clipboard references.

• Accounts for Monaco multi-cursor full and spread paste behavior at the 50 MiB file boundary.
• Validates raw, rich HTML, and canonical Markdown results before accepting pastes.
• Scopes selection-context and image exemptions to compatible editors.
• Preserves prompt chip rendering for long prompts containing skill references.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/text-editor-paste.ts	Projects retained and inserted UTF-8 bytes across Monaco selections, including full and distributed multi-cursor modes.
apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/text-editor.tsx	Integrates exact projected-result admission with Monaco’s current model selections and paste mode.
apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/paste-admission.ts	Adds early clipboard bounds and canonical Markdown transaction validation.
apps/sim/app/_shell/paste-admission-guard.tsx	Scopes structured-reference and image exemptions while delegating exact text-result checks to specialized editors.
apps/sim/app/workspace/[workspaceId]/home/components/user-input/components/prompt-editor/prompt-editor.tsx	Retains enhanced rendering for long prompts containing skill-chip triggers and opts into structured clipboard references.
packages/utils/src/paste.ts	Aligns the text-editor paste ceiling with the existing 50 MiB workspace-file content boundary.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  P[Clipboard paste] --> G[Shell admission guard]
  G -->|Structured prompt reference| R[Prompt reference handler]
  G -->|Image file for opted-in editor| I[Image handler]
  G -->|Monaco text| M[Project multi-cursor result]
  G -->|Rich Markdown| H[Check text and HTML payloads]
  M --> B{Within 50 MiB result boundary?}
  H --> C[Canonical Markdown transaction]
  C --> D{Within rich-document boundary?}
  B -->|Yes| A[Accept paste]
  B -->|No| X[Reject and warn]
  D -->|Yes| A
  D -->|No| X

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[cubic-dev-ai]

All reported issues were addressed across 13 files

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[waleedlatif1]

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