# Track Specification: Track Progress Visualization (track_progress_viz_20260306)

## Overview
Progress bars and percentage completion for active tracks and tickets. Better visualization of DAG execution state.

## Architectural Constraints
- **Accurate State**: Progress MUST reflect actual ticket status.
- **Efficient Updates**: Status changes MUST trigger efficient UI updates.

## Functional Requirements
- **Progress Bar**: Visual bar showing % complete.
- **Percentage Text**: Display numeric % completion.
- **Ticket Breakdown**: Show completed/remaining counts.
- **ETA Estimate**: Calculate approximate completion time.

## Acceptance Criteria
- [ ] Progress bar renders.
- [ ] Percentage accurate.
- [ ] Counts match actual tickets.
- [ ] ETA calculation works.
- [ ] Updates reflect state changes.