feat: added loading state to refresh tasks

[rohansen856]

Description

Please include a summary of the change and which issue is fixed. List any dependencies that are required for this change.

Fixes #433

Replace issue_no with the issue number which is fixed in this PR

Screenshots

Screencast.from.2025-01-21.21-42-57.webm

Summary

• updated home_page_app_bar.dart to include the loader logic
• updated the home_page_controller.dart to include isRefreshing boolean flag
• modified all language sentences to add the versions of English sentenceFetching tasks.

Checklist

• Tests have been added or updated to cover the changes
• Documentation has been updated to reflect the changes
• Code follows the established coding style guidelines
• All tests are passing