Fix some 3D coordinate type hints

[greschd]

Use the more specific type hint tuple[float, float, float], instead of tuple[float, ...]
since the length is fixed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.88%. Comparing base (2c0a6a0) to head (e8f409d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #865   +/-   ##
=======================================
  Coverage   94.88%   94.88%           
=======================================
  Files         110      110           
  Lines        5842     5842           
  Branches      339      339           
=======================================
  Hits         5543     5543           
  Misses        298      298           
  Partials        1        1           

Flag	Coverage Δ
direct-launch	91.36% <ø> (ø)
minimum-deps	93.00% <ø> (ø)
python-3.10	94.07% <ø> (ø)
python-3.11	94.00% <ø> (ø)
python-3.12	94.00% <ø> (ø)
python-3.13	94.24% <ø> (ø)
server-2024R2	90.46% <ø> (ø)
server-2025R1	94.04% <ø> (ø)
server-2025R2	94.00% <ø> (ø)
server-2026R1	94.00% <ø> (ø)
server-latest	94.64% <ø> (ø)

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