VSCode extension: Add 'bypassPermissions' to permission mode dropdown

Summary

The VSCode extension's permission mode dropdown only shows three options:

• Edit automatically
• Plan mode
• Ask before edits

However, the bypassPermissions mode is supported in the settings JSON file and works correctly when configured there. It would be helpful to expose this option in the UI dropdown for consistency with the CLI.

Current behavior

Setting "defaultMode": "bypassPermissions" in .claude/settings.json works - tools run without prompts. But the UI dropdown doesn't show this as a selectable option.

Expected behavior

The permission mode dropdown in the VSCode extension should include "Bypass permissions" as a fourth option.

Environment

• Running in GitHub Codespaces
• Claude Code VSCode extension

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