front: fix pathfinding success message persistence

[Math-R]

close #5617

[codecov]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (9a4e4a3) 19.72% compared to head (f94ec00) 19.72%.

Files	Patch %	Lines
front/src/common/Pathfinding/Pathfinding.tsx	6.66%	14 Missing ⚠️
...onents/ManageTrainSchedule/Itinerary/Itinerary.tsx	0.00%	7 Missing ⚠️
...s/operationalStudies/views/ManageTrainSchedule.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #5927      +/-   ##
============================================
- Coverage     19.72%   19.72%   -0.01%     
  Complexity     2117     2117              
============================================
  Files           910      910              
  Lines        108656   108662       +6     
  Branches       2663     2663              
============================================
+ Hits          21430    21431       +1     
- Misses        85655    85660       +5     
  Partials       1571     1571              

Flag	Coverage Δ
front	8.43% <4.34%> (+<0.01%)	⬆️

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