Visual Differentiation (Row Colors) for Completed vs. Incomplete Rows

### Description

I propose an enhancement to improve user clarity when working with repeating groups or table-like components.

**Current Behavior**
Rows do not visually indicate whether they are completed or still incomplete. Users must manually check the contents of each row to understand which rows still require input.

**Proposed Change**
Implement different background colors (or other visual indicators) for:
- Completed rows (all required fields filled)
- Incomplete rows (one or more required fields missing)

This would give users a clear, immediate overview of their progress.

**Benefits**
- Improves usability by making it visually obvious what is finished and what still needs attention.
- Reduces risk of overlooking incomplete rows.
- Aligns with common UX best practices for status indicators.

Illustration of color indicators (with random colors)

### Additional Information

_No response_

No files, tests, or entry points are identified. Start by locating the repeating-group or table-like row components, then trace how required-field completion is determined; done means completed and incomplete rows have distinct, clear visual indicators without obscuring required input.

Written by the indexing model from the issue text.