fix: skip auto refresh for disabled widgets

[jvsena42]

Closes #197

Description

This PR skips the auto refresh for disabled widgets, saving resources

Preview

No visual change

Screen_recording_20251226_111216.webm

QA Notes

1. Enable widget → coroutine starts:

• Enable a widget from settings
• Check logs - should see "Updated $widgetType widget successfully]"
• Verify widget data refreshes periodically

2. Disable widget → coroutine stops:

• Disable a widget from settings
• Check logs - should see "Stopped refresh coroutine for [TYPE]"
• Verify no more network requests for that widget

3. Preview screen refresh:

• Open each preview screen
• Verify fresh data loads
• Confirm no errors in logs

[Copilot]

Pull request overview

This PR optimizes widget resource usage by implementing conditional auto-refresh logic that only runs for enabled widgets. The implementation adds lifecycle-aware refresh management through job tracking and widget state observation, while also ensuring preview screens can manually trigger refresh when displayed.

Key changes:

• Widget refresh coroutines now start/stop based on enable/disable state
• Preview screens manually refresh data when displayed via refreshOnDisplay() methods
• Centralized job management using ConcurrentHashMap to track active widget refresh coroutines

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

File	Description
WidgetsRepo.kt	Core implementation: replaces unconditional periodic updates with state-aware job management that starts/stops refresh coroutines based on widget enable/disable status
WeatherViewModel.kt, PriceViewModel.kt, HeadlinesViewModel.kt, FactsViewModel.kt, BlocksViewModel.kt	Adds refreshOnDisplay() method to each ViewModel for manual refresh triggering
WeatherPreviewScreen.kt, PricePreviewScreen.kt, HeadlinesPreviewScreen.kt, FactsPreviewScreen.kt, BlocksPreviewScreen.kt	Adds LaunchedEffect to trigger refresh when preview screen is displayed