Handle resuming migration with app opened in multiple tabs

- Secure context:
  - Yes: allow only one tab to resume the migration
  - No: disable resume functionality
- Sync progress between tabs

CHANGELOG.md

@@ -28,6 +28,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**Migration**) Sort unselected matched entries by 1. their latest chapter, 2. their source priority, 3. their title
 - (**Migration**) Change migration match exclude/include icons
 - (**Migration**) Show the exclude/include button only for an entry with a selected match
+- (**Migration**) Allow resuming a migration only in a secure context (localhost or https)
 - (**Source/Extension**) Rename language "All" to "Multi"
 - (**Reader**) Simplify changing settings in desktop sidebar
 - (**Reader**) Ignore tap zone clicks while window does not have focus
@@ -48,6 +49,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**Migration**) Fix being unable to retry failed search for a match without a selected match
 - (**Migration**) Fix selecting a destination from a source browse search page
 - (**Migration**) Fix being able to migrate an entry to itself
+- (**Migration**) Fix resuming migration when app is opened in multiple tabs
 - (**Reader**) Fix scrollbar appearing with "fit to widt/height/screen" page scale mode and applied safe area insets
 - (**Reader**) Fix wrongly positioned mobile progress bar current page indicator
 - (**Reader**) Fix mobile progress bar previous/next chapter button visibility on hover and while disabled