feat: add experimental setting to disable diff visualization for all edit tools

[hannesrudolph]

Summary

• Added a new experimental setting disableDiffVisualization that allows users to disable diff visualization for ALL edit tools
• When enabled, files will open directly in the editor instead of showing a side-by-side diff view for all edit tools:
  • write_to_file
  • apply_diff
  • insert_content
  • search_and_replace
• This helps prevent Language Server Protocol (LSP) crashes that can occur with very large files, particularly affecting C# developers
• Changes made by Roo are still visible in the chat window

Implementation Details

• Added disableDiffVisualization as an experimental feature in the experiments schema
• Modified DiffViewProvider to check the experiment setting and open files directly when disabled
• Added UI toggle in Experimental Settings (not under provider settings)
• Added translation strings for the new experimental feature
• Updated all edit tools to respect this setting through the existing DiffViewProvider.open() method

Key Changes

• Moved to Experimental: This is now properly categorized as an experimental feature
• Affects ALL Edit Tools: Unlike the initial implementation, this now affects all file editing operations
• Proper Architecture: Uses the existing experiment framework instead of global settings

Related Issues

This addresses the concern raised in #4576 (comment) about URI length limitations causing C# LSP crashes.

Closes #1696

Test plan

• Verify the setting appears in the UI under Experimental Settings
• Test that toggling the setting on/off works correctly
• Confirm that when enabled, files open directly in editor without diff view for ALL edit tools
• Ensure changes are still visible in the chat window
• Verify no TypeScript compilation errors
• Confirm linting passes

🤖 Generated with Claude Code

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Important

Adds disableDiffVisualization setting to open files directly in editor, preventing LSP crashes with large files, with UI and test updates.

• Behavior:
  • Adds disableDiffVisualization setting to disable diff view, opening files directly in editor.
  • Prevents LSP crashes with large files, especially for C#.
  • Changes still visible in chat window.
• Implementation:
  • Adds disableDiffVisualization to settings schema in experiment.ts.
  • Modifies DiffViewProvider to check setting and open files directly if disabled.
  • Updates ClineProvider to pass setting to Task.
  • Adds UI toggle under Advanced > Diff Settings in settings.json.
  • Updates tests in experiments.test.ts and ExtensionStateContext.test.tsx.
• Misc:
  • Adds translation strings for new setting in settings.json.

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[hannesrudolph]

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