Browser Reopen Root-Cause Fix, Freeze-Proofing, Background CPU

Improvements

• Instant Tab Close: Closing a live tab from the sidebar now removes it immediately, without waiting for the browser to respond.
• Smoother Sidebar: Browser checks now run fully in the background, removing brief hitches while you scroll and click.

Bug Fixes

• Quitting a browser with many tabs open no longer brings it back on its own.
• The app no longer freezes when a browser stops responding; the sidebar stays usable and catches up once the browser recovers.
• SupaSidebar no longer keeps using CPU in the background after you close the welcome window.
• Switching tabs no longer flashes the profile detection indicator when there is no suggestion to make.