[alejoe91]

This PR implements a ComparisonController and several views to facilitate the comparison and inspection of the output of two spike sorters.

It implements a new run_mainwindow_comparison function:

from spikeinterface_gui import run_mainwindow_comparison

run_mainwindow_comparison(
    analyzer_dartsort,
    analyzer_kilosort4,
    analyzer1_name="dartsort",
    analyzer2_name="kilosort4",
    match_score=0.3,
    verbose=True,
    # skip_extensions=["waveforms"],
    mode="web", # or "web"
    user_settings=user_settings
)

And a bunch of comparison views, with a comparison preset:

• CompareUnitListView: core of the comparison, display pairs of matched units + unmatched units by sorters, ordered by agreement
• VennView: Venn diagram with units in agreement, with a slider to change the agreement thredhold. Clicking on regions randomly select units from that region (match, sorter1 only, sorter2 only)
• AgreementMatrixView: same as similarity view, but displaying agreement. Selecting a unit on the diagonal will select the corresponding row in the CompareUnitListView. Off-diagonal clicks (e.g. to check oversplits) will select units in the "classic" UnitListView" (by default same zone as CompareUnitListView`)
• CompareSpikeListView: venn diagram at the spike level, for unit pairs. It also shows sample waveforms from the different groups (match, sorter1 only, sorter2 only) when the waveforms extension is available (no recompute)
• CompareMetricsView: shows scatters of selected metrics, only for paired units above the match threshold defined in the VennView

Ready to review on my end!

Docs are updated and tested both desktop and web modes!

Screencast.from.2026-10-27.15-19-01.webm