fix: read-only mode - #2740

Greptile Summary

This PR centralizes CodeMirror read-only behavior so read-only documents remain selectable and navigable without focusing an editable input or opening the soft keyboard.

• Adds coordinated state, DOM-editability, focus, transaction, pointer-selection, and context-menu guards.
• Updates quick-tools, palettes, panels, commands, and navigation flows to respect read-only editors.
• Adds unit coverage for read-only configuration, selection-menu filtering, quick-tools behavior, and TypeScript/TSX file icons.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or independently actionable non-blocking issue identified.

The coordinated read-only state, DOM editability, focus suppression, transaction filtering, selection handling, and quick-tools routing preserve non-editing interactions while blocking user-originated document mutations.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  FileState[File editable/loading state] --> Reconfigure[Reconfigure read-only compartment]
  Reconfigure --> StateFacet[EditorState.readOnly]
  Reconfigure --> DomFacet[EditorView.editable]
  Reconfigure --> Guards[Input, transaction, and focus guards]
  StateFacet --> Commands[Commands and quick tools]
  DomFacet --> Touch[Touch selection and context menu]
  Guards --> Unfocused[Keep read-only editor unfocused]
  Commands -->|Read-only-safe action| Selection[Selection/navigation update]
  Commands -->|Editing action| Blocked[Document change blocked]
  Touch --> Selection

_{Reviews (1): Last reviewed commit: "fix: read-only mode" | Re-trigger Greptile}

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