test: Created OutputInfoBar with color-coded stats, wired Use This butt…

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

GSD-Task: S01/T04

.gsd/event-log.jsonl

@@ -16,3 +16,4 @@
 {"cmd":"complete-task","params":{"milestoneId":"M002","sliceId":"S01","taskId":"T01"},"ts":"2026-03-26T05:05:22.658Z","actor":"agent","hash":"59aebe24d8f53b7a","session_id":"49f8e0fe-34a0-4608-b519-eca93850ed7c"}
 {"cmd":"complete-task","params":{"milestoneId":"M002","sliceId":"S01","taskId":"T02"},"ts":"2026-03-26T05:07:29.861Z","actor":"agent","hash":"a3980272c7b74afa","session_id":"49f8e0fe-34a0-4608-b519-eca93850ed7c"}
 {"cmd":"complete-task","params":{"milestoneId":"M002","sliceId":"S01","taskId":"T03"},"ts":"2026-03-26T05:15:38.849Z","actor":"agent","hash":"51de22a58ca5b075","session_id":"49f8e0fe-34a0-4608-b519-eca93850ed7c"}
+{"cmd":"complete-task","params":{"milestoneId":"M002","sliceId":"S01","taskId":"T04"},"ts":"2026-03-26T05:17:44.460Z","actor":"agent","hash":"fd1cf932b3152ba6","session_id":"49f8e0fe-34a0-4608-b519-eca93850ed7c"}

.gsd/milestones/M002/slices/S01/S01-PLAN.md

@@ -91,7 +91,7 @@
   - Estimate: 1h30m
   - Files: app/src/hooks/useDebouncedTrace.ts, app/src/components/ParameterSliders.tsx, app/src/components/SvgPreview.tsx, app/src/views/ImportConvert.tsx, app/src/hooks/__tests__/useDebouncedTrace.test.ts
   - Verify: cd app && npx vitest run --reporter=verbose 2>&1 | tail -20 && npx tsc --noEmit 2>&1 | tail -10
-- [ ] **T04: Add output info bar, Use This flow, error states, and verify full integration** — Complete the slice by adding the output info bar with color-coded stats, the 'Use This' button that advances to View 2, error/empty states, and a full-stack integration verification.
+- [x] **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** — Complete the slice by adding the output info bar with color-coded stats, the 'Use This' button that advances to View 2, error/empty states, and a full-stack integration verification.
 
 ## Steps
 

.gsd/milestones/M002/slices/S01/tasks/T03-VERIFY.json

@@ -0,0 +1,16 @@
+{
+  "schemaVersion": 1,
+  "taskId": "T03",
+  "unitId": "M002/S01/T03",
+  "timestamp": 1774502143859,
+  "passed": true,
+  "discoverySource": "task-plan",
+  "checks": [
+    {
+      "command": "cd app",
+      "exitCode": 0,
+      "durationMs": 3,
+      "verdict": "pass"
+    }
+  ]
+}

.gsd/milestones/M002/slices/S01/tasks/T04-SUMMARY.md

@@ -0,0 +1,81 @@
+---
+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.

.gsd/state-manifest.json

@@ -1,6 +1,6 @@
 {
   "version": 1,
-  "exported_at": "2026-03-26T05:15:38.848Z",
+  "exported_at": "2026-03-26T05:17:44.459Z",
   "milestones": [
     {
       "id": "M001",
@@ -990,19 +990,26 @@
       "milestone_id": "M002",
       "slice_id": "S01",
       "id": "T04",
-      "title": "Add output info bar, Use This flow, error states, and verify full integration",
+      "title": "Created OutputInfoBar with color-coded stats, wired Use This button with disabled state, added 7 component tests — 23/23 tests pass, zero TS errors",
-      "status": "pending",
+      "status": "complete",
-      "one_liner": "",
+      "one_liner": "Created OutputInfoBar with color-coded stats, wired Use This button with disabled state, added 7 component tests — 23/23 tests pass, zero TS errors",
-      "narrative": "",
+      "narrative": "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_result": "",
+      "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).",
       "duration": "",
-      "completed_at": null,
+      "completed_at": "2026-03-26T05:17:44.406Z",
       "blocker_discovered": false,
-      "deviations": "",
+      "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": "",
+      "known_issues": "None.",
-      "key_files": [],
+      "key_files": [
-      "key_decisions": [],
+        "app/src/components/OutputInfoBar.tsx",
-      "full_summary_md": "",
+        "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"
+      ],
+      "full_summary_md": "---\nid: T04\nparent: S01\nmilestone: M002\nkey_files:\n  - app/src/components/OutputInfoBar.tsx\n  - app/src/components/__tests__/OutputInfoBar.test.tsx\n  - app/src/views/ImportConvert.tsx\n  - app/src/App.css\nkey_decisions:\n  - Use This button always visible but disabled when no SVG output — avoids layout shift vs conditional render\nduration: \"\"\nverification_result: passed\ncompleted_at: 2026-03-26T05:17:44.415Z\nblocker_discovered: false\n---\n\n# 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\n\n**Created OutputInfoBar with color-coded stats, wired Use This button with disabled state, added 7 component tests — 23/23 tests pass, zero TS errors**\n\n## What Happened\n\nBuilt 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.\n\n## Verification\n\nnpx tsc --noEmit: zero errors. npx vitest run --reporter=verbose: 23/23 tests pass across 3 test files (9 API client, 7 OutputInfoBar, 7 useDebouncedTrace).\n\n## Verification Evidence\n\n| # | Command | Exit Code | Verdict | Duration |\n|---|---------|-----------|---------|----------|\n| 1 | `cd app && npx tsc --noEmit` | 0 | ✅ pass | 6400ms |\n| 2 | `cd app && npx vitest run --reporter=verbose` | 0 | ✅ pass | 2500ms |\n\n\n## Deviations\n\nUse 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.\n\n## Known Issues\n\nNone.\n\n## Files Created/Modified\n\n- `app/src/components/OutputInfoBar.tsx`\n- `app/src/components/__tests__/OutputInfoBar.test.tsx`\n- `app/src/views/ImportConvert.tsx`\n- `app/src/App.css`\n",
       "description": "Complete the slice by adding the output info bar with color-coded stats, the 'Use This' button that advances to View 2, error/empty states, and a full-stack integration verification.\n\n## Steps\n\n1. Create `app/src/components/OutputInfoBar.tsx`:\n   - Accepts `metadata: TraceMetadata | null`\n   - When metadata is null: render nothing or a muted placeholder\n   - Render stats: Path Count, Total Nodes, Open Paths, Processing Time\n   - Color coding: green for normal values, yellow when node_count_total > 5000, red when open_paths > 0\n   - Show warnings from metadata.warnings array if any\n2. Add 'Use This' button to `ImportConvert.tsx`:\n   - Disabled when no SVG output is available\n   - On click: call `onUseThis(svgOutput, metadata)` prop, which App.tsx uses to transition view state to 'canvas'\n   - Pass the SVG string forward (stored in App.tsx state for S02 to consume)\n3. Add empty/error states throughout:\n   - No file selected: show upload prompt in preview area\n   - API error: show error message in preview area with status code\n   - Loading: show spinner overlay on preview\n4. Write `app/src/components/__tests__/OutputInfoBar.test.tsx` — test color coding logic:\n   - Normal metadata → green indicators\n   - High node count → yellow indicator\n   - Open paths > 0 → red indicator\n   - Null metadata → no crash, placeholder shown\n5. Final verification: ensure `npx tsc --noEmit` passes with zero errors, `npx vitest run` passes all tests, and all components are wired together end-to-end.",
       "estimate": "45m",
       "files": [
@@ -1312,6 +1319,28 @@
       "verdict": "✅ pass",
       "duration_ms": 2800,
       "created_at": "2026-03-26T05:15:38.801Z"
+    },
+    {
+      "id": 21,
+      "task_id": "T04",
+      "slice_id": "S01",
+      "milestone_id": "M002",
+      "command": "cd app && npx tsc --noEmit",
+      "exit_code": 0,
+      "verdict": "✅ pass",
+      "duration_ms": 6400,
+      "created_at": "2026-03-26T05:17:44.406Z"
+    },
+    {
+      "id": 22,
+      "task_id": "T04",
+      "slice_id": "S01",
+      "milestone_id": "M002",
+      "command": "cd app && npx vitest run --reporter=verbose",
+      "exit_code": 0,
+      "verdict": "✅ pass",
+      "duration_ms": 2500,
+      "created_at": "2026-03-26T05:17:44.406Z"
     }
   ]
 }

app/src/App.css

@@ -324,6 +324,77 @@
   cursor: not-allowed;
 }
 
+/* Output Info Bar */
+.output-info-bar {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  padding: 10px 12px;
+  background: var(--code-bg);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  font-size: 13px;
+}
+
+.output-info-bar--empty {
+  opacity: 0.6;
+}
+
+.output-info-placeholder {
+  color: var(--text);
+  font-size: 13px;
+}
+
+.output-info-stats {
+  display: flex;
+  gap: 16px;
+  flex-wrap: wrap;
+}
+
+.output-stat {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 1px;
+}
+
+.output-stat-label {
+  font-size: 11px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  color: var(--text);
+}
+
+.output-stat-value {
+  font-size: 15px;
+  font-weight: 600;
+  font-variant-numeric: tabular-nums;
+}
+
+.output-stat--green .output-stat-value {
+  color: #27ae60;
+}
+
+.output-stat--yellow .output-stat-value {
+  color: #f39c12;
+}
+
+.output-stat--red .output-stat-value {
+  color: #e74c3c;
+}
+
+.output-info-warnings {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.output-info-warning {
+  font-size: 12px;
+  color: #e67e22;
+}
+
 /* Placeholder views */
 .placeholder-view {
   display: flex;

app/src/components/OutputInfoBar.tsx

@@ -0,0 +1,68 @@
+import type { TraceMetadata } from '../types/engine';
+
+interface OutputInfoBarProps {
+  metadata: TraceMetadata | null;
+}
+
+type StatColor = 'green' | 'yellow' | 'red';
+
+function getNodeCountColor(count: number): StatColor {
+  if (count > 5000) return 'yellow';
+  return 'green';
+}
+
+function getOpenPathsColor(count: number): StatColor {
+  if (count > 0) return 'red';
+  return 'green';
+}
+
+export default function OutputInfoBar({ metadata }: OutputInfoBarProps) {
+  if (!metadata) {
+    return (
+      <div className="output-info-bar output-info-bar--empty">
+        <span className="output-info-placeholder">
+          Trace an image to see output stats
+        </span>
+      </div>
+    );
+  }
+
+  const nodeColor = getNodeCountColor(metadata.node_count_total);
+  const openPathsColor = getOpenPathsColor(metadata.open_paths);
+
+  return (
+    <div className="output-info-bar">
+      <div className="output-info-stats">
+        <span className="output-stat output-stat--green" data-testid="stat-paths">
+          <span className="output-stat-label">Paths</span>
+          <span className="output-stat-value">{metadata.path_count}</span>
+        </span>
+        <span
+          className={`output-stat output-stat--${nodeColor}`}
+          data-testid="stat-nodes"
+        >
+          <span className="output-stat-label">Nodes</span>
+          <span className="output-stat-value">{metadata.node_count_total.toLocaleString()}</span>
+        </span>
+        <span
+          className={`output-stat output-stat--${openPathsColor}`}
+          data-testid="stat-open-paths"
+        >
+          <span className="output-stat-label">Open Paths</span>
+          <span className="output-stat-value">{metadata.open_paths}</span>
+        </span>
+        <span className="output-stat output-stat--green" data-testid="stat-time">
+          <span className="output-stat-label">Time</span>
+          <span className="output-stat-value">{metadata.processing_ms}ms</span>
+        </span>
+      </div>
+      {metadata.warnings.length > 0 && (
+        <div className="output-info-warnings" data-testid="warnings">
+          {metadata.warnings.map((w, i) => (
+            <span key={i} className="output-info-warning">⚠ {w}</span>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}

app/src/components/__tests__/OutputInfoBar.test.tsx

@@ -0,0 +1,88 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import OutputInfoBar from '../OutputInfoBar';
+import type { TraceMetadata } from '../../types/engine';
+
+function makeMetadata(overrides: Partial<TraceMetadata> = {}): TraceMetadata {
+  return {
+    format: 'svg',
+    path_count: 42,
+    node_count_total: 1200,
+    open_paths: 0,
+    island_count: 3,
+    warnings: [],
+    processing_ms: 150,
+    ...overrides,
+  };
+}
+
+describe('OutputInfoBar', () => {
+  it('shows placeholder when metadata is null', () => {
+    const { container } = render(<OutputInfoBar metadata={null} />);
+    expect(container.querySelector('.output-info-bar--empty')).toBeTruthy();
+    expect(screen.getByText(/trace an image/i)).toBeInTheDocument();
+  });
+
+  it('renders stats with green indicators for normal metadata', () => {
+    const meta = makeMetadata();
+    render(<OutputInfoBar metadata={meta} />);
+
+    const pathsStat = screen.getByTestId('stat-paths');
+    expect(pathsStat).toHaveClass('output-stat--green');
+    expect(pathsStat).toHaveTextContent('42');
+
+    const nodesStat = screen.getByTestId('stat-nodes');
+    expect(nodesStat).toHaveClass('output-stat--green');
+    expect(nodesStat).toHaveTextContent('1,200');
+
+    const openStat = screen.getByTestId('stat-open-paths');
+    expect(openStat).toHaveClass('output-stat--green');
+    expect(openStat).toHaveTextContent('0');
+
+    const timeStat = screen.getByTestId('stat-time');
+    expect(timeStat).toHaveClass('output-stat--green');
+    expect(timeStat).toHaveTextContent('150ms');
+  });
+
+  it('shows yellow indicator when node_count_total > 5000', () => {
+    const meta = makeMetadata({ node_count_total: 8500 });
+    render(<OutputInfoBar metadata={meta} />);
+
+    const nodesStat = screen.getByTestId('stat-nodes');
+    expect(nodesStat).toHaveClass('output-stat--yellow');
+    expect(nodesStat).toHaveTextContent('8,500');
+  });
+
+  it('shows red indicator when open_paths > 0', () => {
+    const meta = makeMetadata({ open_paths: 3 });
+    render(<OutputInfoBar metadata={meta} />);
+
+    const openStat = screen.getByTestId('stat-open-paths');
+    expect(openStat).toHaveClass('output-stat--red');
+    expect(openStat).toHaveTextContent('3');
+  });
+
+  it('shows both yellow and red indicators simultaneously', () => {
+    const meta = makeMetadata({ node_count_total: 6000, open_paths: 5 });
+    render(<OutputInfoBar metadata={meta} />);
+
+    expect(screen.getByTestId('stat-nodes')).toHaveClass('output-stat--yellow');
+    expect(screen.getByTestId('stat-open-paths')).toHaveClass('output-stat--red');
+  });
+
+  it('displays warnings when present', () => {
+    const meta = makeMetadata({ warnings: ['Too many paths', 'Complex geometry'] });
+    render(<OutputInfoBar metadata={meta} />);
+
+    const warnings = screen.getByTestId('warnings');
+    expect(warnings).toHaveTextContent('Too many paths');
+    expect(warnings).toHaveTextContent('Complex geometry');
+  });
+
+  it('does not render warnings container when no warnings', () => {
+    const meta = makeMetadata({ warnings: [] });
+    render(<OutputInfoBar metadata={meta} />);
+
+    expect(screen.queryByTestId('warnings')).not.toBeInTheDocument();
+  });
+});

app/src/views/ImportConvert.tsx

@@ -4,6 +4,7 @@ import FileUpload from '../components/FileUpload';
 import PresetSelector from '../components/PresetSelector';
 import ParameterSliders from '../components/ParameterSliders';
 import SvgPreview from '../components/SvgPreview';
+import OutputInfoBar from '../components/OutputInfoBar';
 import { useDebouncedTrace } from '../hooks/useDebouncedTrace';
 import styles from './ImportConvert.module.css';
 
@@ -93,15 +94,14 @@ export default function ImportConvert({ onUseThis }: ImportConvertProps) {
           params={currentParams}
           onChange={handleParamsChange}
         />
-        {svgOutput && (
         <button
           type="button"
           className="use-this-btn"
+          disabled={!svgOutput || isLoading}
           onClick={handleUseThis}
         >
           Use This →
         </button>
-        )}
       </div>
       <div className={styles.rightPanel}>
         <SvgPreview
@@ -110,6 +110,7 @@ export default function ImportConvert({ onUseThis }: ImportConvertProps) {
           error={error}
           metadata={metadata}
         />
+        <OutputInfoBar metadata={metadata} />
       </div>
     </div>
   );