Changed how extension permissions and enabled state are tracked.

Previously, Bike tracked this by modifying extension metadata files. It now tracks these states through user defaults instead. One result is that disabled core extensions, such as the Calendar extension, now remain disabled across launches. Permission tracking and related alerts have also been updated.

• Improved row text move commands
• Changed Commands Explorer to accept comma-separated keybindings
• Changed row text delete to preserve selection mode
• Changed multi-row paste to splice into caret and text selections
• Changed empty body row paste to adopt first pasted row’s type
• Removed heading numbers from the default style