Change heat generation units and name

[DavidMStraub]

When creating a sim in PathView, I noticed two inconsistencies in the output of cell vs the input of the lumped thermal model block:

1. the cell had Q_heat as output port name, the thermal model Q_dot as input
2. the cell returned the volume averaged heating, the thermal model expected the total heating.

Both are named Q_dot now and are in Watts.

[Copilot]

Pull request overview

This PR aligns the PyBaMM cell blocks’ heat-generation output with the lumped thermal model by (1) standardizing the port name to Q_dot and (2) switching the reported quantity to total heat generation in Watts.

Changes:

• Renamed cell heat output port from Q_heat to Q_dot across blocks and tests.
• Switched PyBaMM output variable from volumetric heating (... [W.m-3]) to total heating (... [W]) and updated docstrings accordingly.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
src/pathsim_batt/cells/pybamm_cell.py	Renames heat output port to Q_dot and changes heat output variable/units to total heating in W.
tests/cells/test_pybamm_cell.py	Updates tests to expect Q_dot instead of Q_heat in labels, comments, and assertions.

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