…shots

- Add a Format/Formatted toggle so Copy/Edit can use the selected content view’s
  prettified output while keeping the displayed payload unchanged.
- Edit mode now loads either raw content.data (default) or prettified content
  view output (when enabled), including syntax highlighting.
- Update HttpMessage Jest mocks and snapshots for the new button and fetch paths.

- Add setClipboardMocks() helper to mock navigator.clipboard in tests
- Test Format button toggles between "Format" and "Formatted" labels
- Verify Copy uses raw content.data when Format is off
- Verify Copy uses prettified content view JSON when Format is on
- Verify Edit fetches prettified content view when Format is on
- Check correct fetch URLs are called for raw vs formatted content paths