---
id: T04
parent: S01
milestone: M002
provides: []
requires: []
affects: []
key_files: ["app/src/components/OutputInfoBar.tsx", "app/src/components/__tests__/OutputInfoBar.test.tsx", "app/src/views/ImportConvert.tsx", "app/src/App.css"]
key_decisions: ["Use This button always visible but disabled when no SVG output — avoids layout shift vs conditional render"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "npx tsc --noEmit: zero errors. npx vitest run --reporter=verbose: 23/23 tests pass across 3 test files (9 API client, 7 OutputInfoBar, 7 useDebouncedTrace)."
completed_at: 2026-03-26T05:17:44.406Z
blocker_discovered: false
---

# T04: Created OutputInfoBar with color-coded stats, wired Use This button with disabled state, added 7 component tests — 23/23 tests pass, zero TS errors

> Created OutputInfoBar with color-coded stats, wired Use This button with disabled state, added 7 component tests — 23/23 tests pass, zero TS errors

## What Happened
---
id: T04
parent: S01
milestone: M002
key_files:
  - app/src/components/OutputInfoBar.tsx
  - app/src/components/__tests__/OutputInfoBar.test.tsx
  - app/src/views/ImportConvert.tsx
  - app/src/App.css
key_decisions:
  - Use This button always visible but disabled when no SVG output — avoids layout shift vs conditional render
duration: ""
verification_result: passed
completed_at: 2026-03-26T05:17:44.415Z
blocker_discovered: false
---

# T04: Created OutputInfoBar with color-coded stats, wired Use This button with disabled state, added 7 component tests — 23/23 tests pass, zero TS errors

**Created OutputInfoBar with color-coded stats, wired Use This button with disabled state, added 7 component tests — 23/23 tests pass, zero TS errors**

## What Happened

Built the OutputInfoBar component displaying trace metadata (Path Count, Total Nodes, Open Paths, Processing Time) with color-coded indicators: green for normal values, yellow when node_count_total > 5000, red when open_paths > 0. Null metadata shows a muted placeholder. Warnings render below the stats. Updated ImportConvert to render OutputInfoBar below the preview and changed the Use This button to always-visible with disabled state (disabled when no SVG output or loading). Added CSS for the info bar. Wrote 7 tests covering all color coding thresholds and edge cases. Verified empty/error/loading states from T03's SvgPreview remain correct.

## Verification

npx tsc --noEmit: zero errors. npx vitest run --reporter=verbose: 23/23 tests pass across 3 test files (9 API client, 7 OutputInfoBar, 7 useDebouncedTrace).

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd app && npx tsc --noEmit` | 0 | ✅ pass | 6400ms |
| 2 | `cd app && npx vitest run --reporter=verbose` | 0 | ✅ pass | 2500ms |


## Deviations

Use This button changed from conditionally rendered to always-visible with disabled attribute — better UX (no layout shift). Empty/error/loading states already complete from T03.

## Known Issues

None.

## Files Created/Modified

- `app/src/components/OutputInfoBar.tsx`
- `app/src/components/__tests__/OutputInfoBar.test.tsx`
- `app/src/views/ImportConvert.tsx`
- `app/src/App.css`


## Deviations
Use This button changed from conditionally rendered to always-visible with disabled attribute — better UX (no layout shift). Empty/error/loading states already complete from T03.

## Known Issues
None.
