Added the 'Export bookmarks' feature.

[MohitMaliFtechiz]

Fixes #822

• The application now exports the 'bookmark.xml' file to the 'Downloads/org.kiwix...' folder.
• Introduced an export bookmark feature in the settings screen, allowing users to export all bookmarks with a simple click easily. A dialog prompt appears before exporting, indicating where the exported bookmarks will be saved.
• A test case for this change was added to our settings test.

screen-20240604-102547.mp4

screen-20240604-171012.mp4

[codecov]

Codecov Report

Attention: Patch coverage is 36.47059% with 108 lines in your changes missing coverage. Please review.

Project coverage is 53.66%. Comparing base (94feb77) to head (cbefb3d).
Report is 13 commits behind head on main.

❗ Current head cbefb3d differs from pull request most recent head 9c6aeec

Please upload reports for the commit 9c6aeec to get more accurate results.

Files	Patch %	Lines
...wix/kiwixmobile/core/settings/CorePrefsFragment.kt	19.75%	58 Missing and 7 partials ⚠️
...rg/kiwix/kiwixmobile/core/dao/LibkiwixBookmarks.kt	42.46%	37 Missing and 5 partials ⚠️
...java/org/kiwix/kiwixmobile/core/StorageObserver.kt	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3724      +/-   ##
============================================
- Coverage     53.86%   53.66%   -0.21%     
- Complexity     1376     1389      +13     
============================================
  Files           298      298              
  Lines         11308    11472     +164     
  Branches       1495     1520      +25     
============================================
+ Hits           6091     6156      +65     
- Misses         4226     4318      +92     
- Partials        991      998       +7     

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[kelson42]

@MohitMaliFtechiz Thank younfor this PR:

• Does it mean bookamrks are handled now in libkiwix and not in Objectbox?
• Why exporting the library.xml? I see no vakue?
• would you be able to code the import as well so the user just has to choose the bookamrks.xml and the he recovers his bookmarks?

[MohitMaliFtechiz]

Does it mean bookamrks are handled now in libkiwix and not in Objectbox?

@kelson42 Yes, now we are saving and retrieving the bookmarks in libkiwix.

Why exporting the library.xml? I see no value?

library.xml contains the favicon and ZIM file path of the saved bookmarks so without exporting the library.xml we can't open the bookmark and the favicon will not be displayed on the bookmark screen.

would you be able to code the import as well so the user just has to choose the bookamrks.xml and the he recovers his bookmarks?

@kelson42 Yes, we can implement functionality in our application and guide the user to select these two files when importing the bookmarks because we need these two files to properly import the bookmarks. I was also thinking about it and i purposed this in group for your feedback.

[kelson42]

I really see a peovlem that library.xnl is mandatory to import bookmark.xml. Please open an issue at kiwix/libkiwix.

[MohitMaliFtechiz]

@kelson42 I have opened a ticket in libkiwix kiwix/libkiwix#1069 for this.

[kelson42]

@MohitMaliFtechiz I believe, at this time, you don't understand how the import of bookmarks will work without having the library.xml exported/imported. Please complete the feature with only the export feature like requested first.