refactor(cell): must_use and simplify style()

[EdJoPaTo]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.3%. Comparing base (fadc73d) to head (c5dd2a8). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1124 +/- ## ======================================= - Coverage 94.3% 94.3% -0.1% ======================================= Files 61 61 Lines 14768 14772 +4 ======================================= - Hits 13935 13931 -4 - Misses 833 841 +8 ```

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