Fixed: Still displaying old storage configurator (at first download).

[MohitMaliFtechiz]

Fixes #4047

• We have removed the "Download book to internal storage?" dialog and updated the "Storage configured" dialog to show the new UI, matching what we have in the "Settings" screen.
• Unused code and strings have been removed from our codebase.
• Created a StorageDeviceExtensions to calculate free and used space, the used percentage, and to retrieve the storage path and title. Since this code was used in both KiwixPrefsFragment and StorageViewHolder, we created this extension to reduce code duplication.
• Refactored InitialDownloadTest to align with our new changes.
• Displaying the storage selection dialog for configuration if an SD card is available at first download. If only internal storage is available, proceed directly with the ZIM file download, as showing the configuration dialog is unnecessary in this case.

This video is for reference of how our UI will show.

XRecorder_04112024_223216_001.mp4

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 58.82%. Comparing base (1576095) to head (f9e4c29).

Files with missing lines	Patch %	Lines
...va/eu/mhutti1/utils/storage/StorageSelectDialog.kt	60.00%	4 Missing and 4 partials ⚠️
...e/nav/destination/library/OnlineLibraryFragment.kt	57.14%	2 Missing and 1 partial ⚠️
...g/kiwix/kiwixmobile/settings/KiwixPrefsFragment.kt	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4051      +/-   ##
============================================
+ Coverage     57.84%   58.82%   +0.97%     
- Complexity     1515     1540      +25     
============================================
  Files           315      316       +1     
  Lines         13161    13192      +31     
  Branches       1676     1680       +4     
============================================
+ Hits           7613     7760     +147     
+ Misses         4448     4329     -119     
- Partials       1100     1103       +3     

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