Fix native editor shortcuts in integrated browser

[kycutler]

Fixes #286633

[Copilot]

Pull request overview

This PR fixes native editor shortcuts (copy, paste, cut, undo, redo, select all) in the integrated browser by moving from a workbench-level command interception approach to a native input event filtering approach in the Electron main process.

Key Changes:

• Removes workbench-level command redirection logic that was forwarding events from BrowserEditor
• Adds native shortcut filtering in the Electron main process before input events are captured and forwarded to VS Code's keybinding system
• Filters Alt-only inputs and common Ctrl/Cmd shortcuts (A, C, V, X, Z) to allow native browser handling

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/vs/workbench/contrib/browserView/electron-browser/browserView.contribution.ts	Removes command redirection code and unused imports (ServicesAccessor, IEditorService, MultiCommand, clipboard actions)
src/vs/platform/browserView/electron-main/browserView.ts	Adds ignoreNativeShortcut function to filter native shortcuts and prevents their interception in before-input-event handler