fix flows multi select readability by using checkbox

[uinstinct]

The ticks on the extreme right are unreadable and problematic to match with their labels on the left.

before

after

Checklist

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🔍 Selection behavior lacks regression coverage

Tests only verify labels and opening the list. Add coverage for selection, deselection, clearing, and checkbox state under the testing standard.

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[desertaxle]

@uinstinct Can you add a test or two to satisfy this review comment?