Fixed: Search was not working when closing a tab and immediately opening the search screen.

[MohitMaliFtechiz]

Fixes #4198

• The issue occurred because, after closing a tab and quickly navigating to the search screen, the snackbar callback was still running in the background. When switching to the search screen, the WebView list was empty because we cleared it when the fragment's view was destroyed. As a result, the book was closed, and the SearchScreen could not find the ZIM file for searching.
• To fix this, we now dismiss the snackbar callback when the fragment's view is destroyed.

screen-20250130-144708.mp4

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 56.79%. Comparing base (553fc44) to head (8be4029).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../kiwix/kiwixmobile/core/main/CoreReaderFragment.kt	66.66%	2 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (66.66%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4199      +/-   ##
============================================
+ Coverage     56.71%   56.79%   +0.08%     
- Complexity     1530     1539       +9     
============================================
  Files           313      313              
  Lines         13510    13506       -4     
  Branches       1695     1694       -1     
============================================
+ Hits           7662     7671       +9     
+ Misses         4681     4669      -12     
+ Partials       1167     1166       -1     

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