Schedule background sync jobs

[MaryammAli]

Implement Background Sync Job Scheduling

Overview

This PR introduces background job scheduling for periodic data synchronization to keep app data fresh without requiring manual user interaction.

Changes Made

• Added a new background sync scheduler service:

  • mobile/services/sync/scheduler.ts

• Evaluated and integrated a background job scheduling solution (e.g. expo-background-fetch).

• Implemented periodic sync execution at configurable intervals.

• Added safeguards to respect:

  • battery usage constraints
  • network availability
  • platform background execution limitations

• Improved scheduling configuration to allow easy interval and behavior adjustments.

Features Added

• Automatic background data synchronization.
• Configurable sync intervals.
• Battery-conscious scheduling behavior.
• Network-aware sync execution.
• Centralized scheduler management for future sync tasks.

Acceptance Criteria

• Background scheduler triggers reliably while the app is in the background.
• Jobs do not execute excessively or negatively impact battery life.
• Scheduling configuration is easy to modify and maintain.
• Sync operations remain stable across app lifecycle events.

Notes

• Scheduler implementation is designed to be extensible for additional background tasks.
• Existing sync logic remains reusable and isolated from scheduling concerns.
• Configuration values can be adjusted without major code changes.
  Closes Schedule Background Sync Jobs #252

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