Supplies the offline plotly.js bundle for the new canvas backend. The
GUI CI job now installs the gui extra so the Qt/WebEngine tests run
instead of being import-skipped.
RUF001-003 are ignored repo-wide: × / ≈ / ² are deliberate in the
engineering docs and formulas, which also makes the scattered inline
noqa suppressions redundant. Tests use engineering symbols (A, I, L, E),
`importorskip` before imports and capitalised test names; Qt requires
camelCase signal names and PascalCase event overrides; OpenSees material
fields (cR1, epsU) mirror the solver verbatim. N806 stays exempt only for
the numeric modules that use L / Iz / Iy as symbols.
Single source of truth for the package + pinned solver versions in
src/otko/_const.py (hatch dynamic version). scipy/pandas were listed in
[gui] but never imported. mypy strict mode rescoped to
core/services/viewmodels; tomli added for tomllib-less Pythons.
