79cf003444
Fixed all three selectors to use rowIdx from dataset.berIdx:
- 'chaining-][value="first"]' → 'chaining-{rowIdx}[value="first"]'
- 'chaining][value="intermediary"]' → 'chaining-{rowIdx}[value="intermediary"]'
- Already fixed: 'chaining]-last' → 'chaining-{rowIdx}-last'
Now bits 0/1/2 correctly set based on First/Intermediary/Last checkboxes.
Frontend: frontend/index.html
Tests: 14 Node green