[MohitMaliFtechiz]

Fixes #5233

• Now, we are only showing this TOC drawer hint if the TOC sidebar is enabled for branded apps.
• Added necessary comments for devs.

[harshsomankar123-tech]

@MohitMaliFtechiz Thanks for the PR!
Instead of overriding in BrandedReaderViewModel, can we handle this directly in CoreReaderViewModel???

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.24%. Comparing base (002331c) to head (13e69e8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../kiwixmobile/custom/main/BrandedReaderViewModel.kt	0.00%	5 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) 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    #5234      +/-   ##
============================================
- Coverage     80.28%   80.24%   -0.04%     
  Complexity     2575     2575              
============================================
  Files           377      377              
  Lines         19788    19793       +5     
  Branches       2395     2395              
============================================
- Hits          15886    15883       -3     
- Misses         2832     2836       +4     
- Partials       1070     1074       +4     

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