remove: drop “Open in Editor” and openInNewTab UI paths

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This PR removes the non-independent editor tab flow that caused state conflicts. Changes: • Remove commands: popoutButtonClicked, openInNewTab (src/package.json, packages/types/src/vscode.ts) • Strip editor/title menu contributions and TabPanel-specific “when” clauses from package.json • Delete command wiring and tab panel launcher logic in registerCommands.ts (openClineInNewTab, popout handler) • Ensure API always uses sidebar provider (src/extension/api.ts) • Update tests to reflect removals (apps/vscode-e2e/extension.test.ts, packages/build/src/tests/index.test.ts). All vitest suites pass across src, webview-ui, and packages/build.

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Important

Remove 'Open in Editor' and 'openInNewTab' functionalities, updating commands, menus, and tests accordingly.

• Behavior:
  • Remove popoutButtonClicked and openInNewTab commands from package.json and vscode.ts.
  • Remove editor/title menu contributions and TabPanel-specific "when" clauses from package.json.
  • Delete command wiring and tab panel launcher logic in registerCommands.ts.
  • Ensure API always uses sidebar provider in api.ts.
• Tests:
  • Update tests in extension.test.ts and index.test.ts to reflect command removals.
• Misc:
  • All vitest suites pass across src, webview-ui, and packages/build.

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Review Complete

I've completed my review of this pull request. No issues were identified.

The PR successfully removes the "Open in Editor" and openInNewTab functionality with all changes properly coordinated across:

• Type definitions (packages/types/src/vscode.ts)
• Command registration (src/activate/registerCommands.ts)
• Package manifest (src/package.json)
• API layer (src/extension/api.ts)
• All related tests

All changes are internally consistent and no bugs were introduced.

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