fix: approve slides link for all pending submissions

[jennifer-richards]

Fixes issue where only slides attached to the first session at a meeting were shown for chair approval. Refactors the view a bit to flatten some redundant authentication checks and simplify typing.

Fixes #6045

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.81%. Comparing base (70bf2ae) to head (03dcaf7).
Report is 38 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8692      +/-   ##
==========================================
- Coverage   88.88%   88.81%   -0.08%     
==========================================
  Files         312      314       +2     
  Lines       40891    41244     +353     
==========================================
+ Hits        36345    36629     +284     
- Misses       4546     4615      +69     

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