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This section details on the original issue you should resolve

<issue_title>flash_response_index() data-label misalignment when filtering by cell type</issue_title>
<issue_description>## Bug

EnsembleView.flash_response_index() produces misaligned data and labels when a subset of cell types is requested via the cell_types parameter.

Root cause

In ensemble_view.py, flash_response_index() filters the FRI DataArray with fris.custom.where(cell_type=cell_types). This preserves xarray's internal (alphabetical) coordinate order for the data values. However, the original cell_types list (in the caller's order) is passed directly to plot_fris() as the label array. When the caller's order differs from alphabetical coordinate order, the plotted violin data and x-axis labels become misaligned.

Example

Requesting cell_types=["Mi1", "Tm3", "Mi4", "Mi9", "CT1(M10)", "Tm1", "Tm2", "Tm4", "Tm9"] for TmY3 inputs:

• fris.custom.where() returns data ordered by coordinate: CT1(M10), Mi1, Mi4, Mi9, Tm1, Tm2, Tm3, Tm4, Tm9
• But the label list passed to plot_fris is still Mi1, Tm3, Mi4, Mi9, CT1(M10), Tm1, Tm2, Tm4, Tm9
• Result: violins are visually mislabeled (e.g., CT1(M10) data appears under the Mi1 label)

Workaround

After filtering, extract the actual coordinate order and pass it as the label list:

filtered = fris.custom.where(cell_type=cell_types)
actual_order = list(filtered.cell_type.values)
plot_fris(
    filtered.values,
    actual_order,
    sorted_type_list=desired_display_order,
    ...
)

Suggested fix

In EnsembleView.flash_response_index(), either:

1. Reindex the filtered DataArray to match the requested cell_types order before extracting .values, or
2. Pass list(fris.cell_type.values) (the actual coordinate order) as the cell_types argument to plot_fris, with cell_types (the user's order) as sorted_type_list.</issue_description>

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