Version 0.6.8

Replaced the persistent in-page control bar with a native browser toolbar popup.
The extension now works quietly in the background and only shows controls when the toolbar icon is clicked.
Added compact popup controls for visible turns, pruning mode, diagnostics, and quick actions.
Preserved early conversation pre-trimming, DOM pruning, lightweight rendering, diagnostics, and 18-language localization.
Reduced unnecessary in-page UI and DOM overhead.