Fixed: Downloads were not automatically starting showing progress when reopening the app(If downloads paused due to any network error).

[MohitMaliFtechiz]

Fixes #4106

• Reenabled the DownloadManager's notification, and configured it to show the ZIM file title instead of filePath.
• Removed the DownloadMonitorService foreground service from the project since now the notification is handled by the DownloadManager which handles it in its own thread. So we don't need to track progress when the app is closed.
• Downloads paused due to network errors like "Waiting to Retry" are now resumed automatically when the network becomes available.
• For downloads configured to only proceed on Wi-Fi, the application will resume progress when a Wi-Fi connection is re-established. Similarly, downloads queued for mobile networks will resume when the mobile network reconnects.
• Fixed: IllegalStateException while setting the toolbar in SearchFragment which I accidentally saw while navigating very frequently to other screens.
• Improved handling of scenarios where download progress was interrupted due to network errors (e.g., network fluctuations). The application now correctly retrieves download progress from the DownloadManager and, if necessary, automatically resumes paused downloads without requiring user intervention.

[codecov]

Codecov Report

Attention: Patch coverage is 77.89855% with 61 lines in your changes missing coverage. Please review.

Project coverage is 57.59%. Comparing base (cae22c8) to head (a1bbd1e).

Files with missing lines	Patch %	Lines
...wnloader/downloadManager/DownloadManagerMonitor.kt	80.00%	39 Missing and 10 partials ⚠️
...e/nav/destination/library/OnlineLibraryFragment.kt	0.00%	2 Missing and 1 partial ⚠️
...g/kiwix/kiwixmobile/core/data/KiwixRoomDatabase.kt	70.00%	3 Missing ⚠️
...loader/downloadManager/DownloadManagerRequester.kt	40.00%	3 Missing ⚠️
...rg/kiwix/kiwixmobile/core/search/SearchFragment.kt	0.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4130      +/-   ##
============================================
- Coverage     58.10%   57.59%   -0.52%     
+ Complexity     1554     1489      -65     
============================================
  Files           316      313       -3     
  Lines         13543    13306     -237     
  Branches       1727     1704      -23     
============================================
- Hits           7869     7663     -206     
+ Misses         4542     4523      -19     
+ Partials       1132     1120      -12     

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