[Condense] Add a slider for the context condense threshold

[canrobins13]

Related GitHub Issue

Closes: #3672

Description

Adds a slider to experimental settings to configure the threshold at which automatic context condensing is run.

Test Procedure

Tried setting various thresholds when translating the settings.json files

Type of Change

• 🐛 Bug Fix: Non-breaking change that fixes an issue.
• ✨ New Feature: Non-breaking change that adds functionality.
• 💥 Breaking Change: Fix or feature that would cause existing functionality to not work as expected.
• ♻️ Refactor: Code change that neither fixes a bug nor adds a feature.
• 💅 Style: Changes that do not affect the meaning of the code (white-space, formatting, etc.).
• 📚 Documentation: Updates to documentation files.
• ⚙️ Build/CI: Changes to the build process or CI configuration.
• 🧹 Chore: Other changes that don't modify src or test files.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Code Quality:
  • My code adheres to the project's style guidelines.
  • There are no new linting errors or warnings (npm run lint).
  • All debug code (e.g., console.log) has been removed.
• Testing:
  • New and/or updated tests have been added to cover my changes.
  • All tests pass locally (npm test).
  • The application builds successfully with my changes.
• Branch Hygiene: My branch is up-to-date (rebased) with the main branch.
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Changeset: A changeset has been created using npm run changeset if this PR includes user-facing changes or dependency updates.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Screenshots / Videos

Documentation Updates

Does this PR necessitate updates to user-facing documentation?

• No documentation updates are required.
• Yes, documentation updates are required.

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Important

Adds a slider to set the context condensing threshold in experimental settings, updating logic, tests, and localization accordingly.

• Behavior:
  • Adds a slider in ExperimentalSettings.tsx to set autoCondenseContextPercent for context condensing.
  • Updates truncateConversationIfNeeded in index.ts to use autoCondenseContextPercent for context condensing logic.
• Tests:
  • Updates sliding-window.test.ts to test autoCondenseContextPercent behavior.
  • Adds tests for context condensing threshold in ClineProvider.test.ts.
• Settings and State:
  • Adds autoCondenseContextPercent to ClineProvider.ts and ExtensionStateContext.tsx.
  • Updates webviewMessageHandler.ts to handle autoCondenseContextPercent messages.
• Localization:
  • Updates localization files to include autoCondenseContextPercent descriptions in multiple languages.

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[mrubens]

Not sure about the test failures but the code looks good to me!