fix(ui): optimize universal paste handling

[waleedlatif1]

Summary

• add one fast paste-admission layer across native inputs, rich text, Monaco, tables, terminals, tags, emails, and secret imports
• reject oversized payloads before expensive parsing while preserving higher limits where downstream systems support them
• batch structured pastes and degrade very large prompt/editor content to cheaper rendering paths

Type of Change

• Bug fix

Testing

• Full Sim, desktop, EMCN, and utils test suites
• Focused paste regression suites (107 tests)
• All-workspace typecheck, lint, block-registry check, and all 36 repository audits

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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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview	Aug 27, 2026 2:57am

[greptile-apps]

Greptile Summary

The PR introduces shared paste-admission limits and cheaper rendering paths across web and desktop editing surfaces.

• Adds a root capture-phase guard and surface-specific validation for prompts, rich Markdown, Monaco, tables, terminals, tags, emails, and secret imports.
• Adds bounded desktop terminal writes and updates the desktop bridge result contract.
• Raises the realtime Socket.IO buffer to accommodate the collaborative-document boundary.
• Debounces chat-draft persistence and batches structured paste processing.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains within the scope of this follow-up review.

No blocking failure remains.

Important Files Changed

Filename	Overview
packages/utils/src/paste.ts	Defines shared UTF-8 measurement, admission policies, limits, and rendering thresholds used across paste surfaces.
apps/sim/app/_shell/paste-admission-guard.tsx	Adds a root capture-phase guard that rejects oversized clipboard text before editor-specific parsing.
apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/paste-admission.ts	Adds projected-document admission for rich Markdown pastes before ProseMirror’s downstream parsing.
apps/sim/app/workspace/[workspaceId]/home/components/user-input/components/prompt-editor/use-prompt-editor.ts	Enforces prompt payload and result limits while preserving compact Sim selection-context pastes.
apps/sim/app/workspace/[workspaceId]/tables/[tableId]/components/table-grid/table-paste.ts	Centralizes structured table-paste parsing and bounded batch processing.
apps/desktop/src/main/ipc.ts	Rejects oversized terminal input and writes admitted text to the PTY in surrogate-safe bounded chunks.
packages/desktop-bridge/src/index.ts	Updates the terminal paste bridge contract to expose the oversized-payload result.
apps/realtime/src/config/socket.ts	Raises the Socket.IO message buffer to include framing overhead above the collaborative-document limit.
apps/sim/app/workspace/[workspaceId]/home/components/user-input/user-input.tsx	Debounces persisted composer-draft writes and flushes pending state during unmount.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  Clipboard[Clipboard payload] --> GlobalGuard[Global paste admission guard]
  GlobalGuard -->|Rejected| Warning[Show size warning]
  GlobalGuard -->|Admitted| Surface{Target surface}
  Surface --> Prompt[Prompt editor]
  Surface --> RichText[Rich Markdown]
  Surface --> Monaco[Text editor]
  Surface --> Table[Table grid]
  Surface --> Terminal[Terminal]
  Surface --> Inputs[Tags, emails, and secrets]
  Prompt --> ResultLimit[Validate projected result]
  RichText --> ResultLimit
  Monaco --> PayloadLimit[Validate payload size]
  Table --> Batch[Parse and apply in batches]
  Terminal --> NativeBridge[Desktop bridge]
  NativeBridge --> PTY[Write bounded chunks to PTY]

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_{Reviews (4): Last reviewed commit: "fix(ui): preserve large context paste be..." | Re-trigger Greptile}

[waleedlatif1]

@greptile

[cubic-dev-ai]

All reported issues were addressed

<sub>Reply with feedback, questions, or to request a fix.

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[waleedlatif1]

@greptile

[waleedlatif1]

@greptile