---
id: T01
parent: S03
milestone: M010
provides: []
requires: []
affects: []
key_files: ["frontend/src/utils/catSlug.ts", "frontend/src/pages/TopicsBrowse.tsx", "frontend/src/pages/SubTopicPage.tsx", "frontend/src/pages/SearchResults.tsx", "frontend/src/App.css"]
key_decisions: ["Placed category badge in subtitle row rather than standalone element for clean visual hierarchy", "Created shared utils/ directory pattern for cross-page helpers"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "TypeScript type-checking (npx tsc --noEmit) and Vite production build (npm run build) both pass with zero errors. 49 modules transformed, output produced at dist/."
completed_at: 2026-03-31T06:25:57.209Z
blocker_discovered: false
---

# T01: Extracted catSlug to shared utility; added category accent border and badge to SubTopicPage, colored category badges to SearchResults cards

> Extracted catSlug to shared utility; added category accent border and badge to SubTopicPage, colored category badges to SearchResults cards

## What Happened
---
id: T01
parent: S03
milestone: M010
key_files:
  - frontend/src/utils/catSlug.ts
  - frontend/src/pages/TopicsBrowse.tsx
  - frontend/src/pages/SubTopicPage.tsx
  - frontend/src/pages/SearchResults.tsx
  - frontend/src/App.css
key_decisions:
  - Placed category badge in subtitle row rather than standalone element for clean visual hierarchy
  - Created shared utils/ directory pattern for cross-page helpers
duration: ""
verification_result: passed
completed_at: 2026-03-31T06:25:57.210Z
blocker_discovered: false
---

# T01: Extracted catSlug to shared utility; added category accent border and badge to SubTopicPage, colored category badges to SearchResults cards

**Extracted catSlug to shared utility; added category accent border and badge to SubTopicPage, colored category badges to SearchResults cards**

## What Happened

Extracted the catSlug helper from TopicsBrowse.tsx into frontend/src/utils/catSlug.ts for cross-page reuse. Updated SubTopicPage with a 4px colored left border using category CSS variables and a colored badge in the subtitle area. Updated SearchResults to render topic_category as a colored badge instead of plain text. Added supporting CSS for border and subtitle layout.

## Verification

TypeScript type-checking (npx tsc --noEmit) and Vite production build (npm run build) both pass with zero errors. 49 modules transformed, output produced at dist/.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd frontend && npx tsc --noEmit` | 0 | ✅ pass | 2500ms |
| 2 | `cd frontend && npm run build` | 0 | ✅ pass | 1500ms |


## Deviations

None.

## Known Issues

None.

## Files Created/Modified

- `frontend/src/utils/catSlug.ts`
- `frontend/src/pages/TopicsBrowse.tsx`
- `frontend/src/pages/SubTopicPage.tsx`
- `frontend/src/pages/SearchResults.tsx`
- `frontend/src/App.css`


## Deviations
None.

## Known Issues
None.
