* docs: fix a typo
* fix(browser): restore timer-based background syncs
The browser extension was not performing scheduled background syncs every 30 minutes as expected. This was due to missing task scheduling code that was accidentally removed during the web push implementation (PR #11346).
This commit:
- Creates a new BackgroundSyncService to manage sync scheduling
- Properly initializes the sync interval in main.background.ts
- Adds a test to ensure the sync initialization code isn't accidentally removed again
- Organizes platform module structure to support the new service
Fixes PM-19396
* review: remove unecassary await keyword
