Navigate to error page when survey ID is invalid

[rfontanarosa]

closes #312
closes #1301

Registrazione.schermo.2026-03-21.alle.21.41.12.mov

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.46%. Comparing base (8d8f16e) to head (bd262fd).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2464      +/-   ##
==========================================
+ Coverage   59.38%   59.46%   +0.07%     
==========================================
  Files         113      113              
  Lines        2797     2800       +3     
  Branches      421      421              
==========================================
+ Hits         1661     1665       +4     
  Misses       1074     1074              
+ Partials       62       61       -1     

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[gino-m]

/gemini-review