Fix context menus being set up twice on startup, which could race two rebuild cycles and throw a duplicate-id error

Version 2.8.1

• Adds a check on browser's startup to compare with couchDB before firing the tabs
• If you have more than 5 tabs to wake up the same time, only fire one notification

v2.8 — Custom Popup Choices

• Customize the snooze choices in the popup: enable, disable, reorder, or add your own (Settings → Popup Choices)
• Add fixed-time choices like "Today at 14:00" or "Tomorrow at 8:00", relative ones like "In 2 hours", or pick any weekday
• Give custom choices an emoji icon
• Export/import now includes your choice configuration alongside snoozed tabs
• Popup closes instantly by default (was 1s)
• No more external favicon fetches — everything stays on your device
• No tracking, no telemetry, no remote analytics

Plus a few fixes: context menu now rebuilds cleanly when you toggle choices, the popup no longer crashes on pages it can't snooze, and disabled choices are properly inert.