Fix nglview not show

[superstar54]

I am testing the app inside normal notebooks, and this PR fixes:

• nglview not show in step 1 and step 4
• cutoffs are wrong in pseudo

[edan-bainglass]

Thanks @superstar54. LGTM! Good catch on the cutoffs issue 💪

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.01%. Comparing base (4dd3741) to head (2f3958e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aiidalab_qe/app/structure/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1130   +/-   ##
=======================================
  Coverage   72.01%   72.01%           
=======================================
  Files         105      105           
  Lines        6871     6876    +5     
=======================================
+ Hits         4948     4952    +4     
- Misses       1923     1924    +1     

Flag	Coverage Δ
python-3.11	72.01% <87.50%> (+<0.01%)	⬆️
python-3.9	72.01% <87.50%> (-0.01%)	⬇️

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