Cleanup TYPE_CHECKING variables

[Dreamsorcerer]

I don't think these should have any actual impact, and the duplicate maintenance is prone to mistakes (note the extra unused type in the else block, top of web_app.py). A few similar cleanups here too.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.73%. Comparing base (6fabae5) to head (2d2b2ea).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11716      +/-   ##
==========================================
- Coverage   98.73%   98.73%   -0.01%     
==========================================
  Files         127      127              
  Lines       43558    43546      -12     
  Branches     2320     2320              
==========================================
- Hits        43007    42995      -12     
  Misses        390      390              
  Partials      161      161              

Flag	Coverage Δ
CI-GHA	98.60% <100.00%> (-0.01%)	⬇️
OS-Linux	98.34% <100.00%> (-0.01%)	⬇️
OS-Windows	96.66% <97.87%> (-0.01%)	⬇️
OS-macOS	97.56% <100.00%> (-0.01%)	⬇️
Py-3.10.11	97.10% <100.00%> (-0.01%)	⬇️
Py-3.10.18	97.60% <100.00%> (-0.01%)	⬇️
Py-3.11.13	97.81% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.31% <100.00%> (-0.01%)	⬇️
Py-3.12.10	97.41% <100.00%> (-0.01%)	⬇️
Py-3.12.11	97.91% <100.00%> (-0.01%)	⬇️
Py-3.13.7	97.91% <100.00%> (-0.01%)	⬇️
Py-3.13.8	97.15% <100.00%> (+<0.01%)	⬆️
Py-3.13.9	96.24% <97.87%> (-0.01%)	⬇️
Py-3.14.0	98.11% <100.00%> (-0.01%)	⬇️
Py-3.14.0t	97.18% <100.00%> (-0.01%)	⬇️
Py-pypy3.10.16-7.3.19	94.21% <100.00%> (+2.09%)	⬆️
VM-macos	97.56% <100.00%> (-0.01%)	⬇️
VM-ubuntu	98.34% <100.00%> (-0.01%)	⬇️
VM-windows	96.66% <97.87%> (-0.01%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging #11716 will not alter performance

_{Comparing Dreamsorcerer-patch-5 (2d2b2ea) with master (6fabae5)}

Summary

✅ 59 untouched

[webknjaz]

Sometimes, it may have impact. FWIW if we ever go for ruff some rules will force putting imports into type checking blocks. It may be worth trying to integrate it and make changes with more linters checking them.

[Dreamsorcerer]

Sometimes, it may have impact. FWIW if we ever go for ruff some rules will force putting imports into type checking blocks. It may be worth trying to integrate it and make changes with more linters checking them.

I don't think there's any notable change to import behaviour here. Ruff is on the list of things to implement in future.