Fix: dont initialize page numbers, allow split with browser pdf viewer

[shamoon]

Proposed change

Forgot to include this in #6304, my bad

Closes #6300 , actually

Type of change

• Bug fix: non-breaking change which fixes an issue.
• New feature / Enhancement: non-breaking change which adds functionality. Please read the important note above.
• Breaking change: fix or feature that would cause existing functionality to not work as expected.
• Documentation only.
• Other. Please explain:

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[shamoon]

Just to be explicit here:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.12%. Comparing base (fe824e0) to head (8884e7b).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #6314   +/-   ##
=======================================
  Coverage   97.12%   97.12%           
=======================================
  Files         420      420           
  Lines       16917    16915    -2     
  Branches     1210     1286   +76     
=======================================
- Hits        16430    16429    -1     
+ Misses        487      484    -3     
- Partials        0        2    +2     

Flag	Coverage Δ
backend	95.94% <ø> (+0.01%)	⬆️
frontend	98.56% <ø> (-0.01%)	⬇️

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[github-actions]

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