---
phase: 41-diagrams-icons-theme-engine
plan: "04"
subsystem: ui
tags: [content-studio, diagrams, icons, shadcn, useContentJob, tdd, vitest, testing-library]

# Dependency graph
requires:
  - phase: 41-01
    provides: useContentJob hook, contentJobs API, progress shadcn component
  - phase: 41-02
    provides: DiagramBundle/IconSetBundle types, server-sanitized SVG assets

provides:
  - ui/src/pages/ContentStudio.tsx — Tabbed page (Diagrams, Icons, Themes) at /:companyId/content-studio
  - ui/src/components/DiagramGeneratePanel.tsx — Prompt + type selector + generate + progress + preview + source editor
  - ui/src/components/DiagramPreview.tsx — SVG render area + SVG/PNG download buttons
  - ui/src/components/DiagramSourcePanel.tsx — Collapsible Mermaid source editor with copy + re-render
  - ui/src/components/DiagramSourcePanel.test.tsx — 6 tests for DIAG-03 collapsible source behavior
  - ui/src/components/IconGeneratePanel.tsx — Description + style/count selectors + generate + progress + grid + download bar
  - ui/src/components/IconResultGrid.tsx — 4-col/2-col responsive grid with per-icon selection and download
  - ui/src/components/IconDownloadBar.tsx — Sticky bar for bulk icon download with format selector
  - ui/src/types/content-bundles.ts — DiagramBundle/IconSetBundle/ThemePaletteBundle UI type contracts

affects: [41-05-ui-generator, 41-06-ui-theme]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "ContentStudio: useCompany().selectedCompanyId passed as companyId to all content panels"
    - "useContentJob pattern: submit -> SSE progress -> done -> fetch asset URL -> JSON.parse bundle"
    - "DiagramSourcePanel dirty state: set on change (not blur) for reliable test assertions"
    - "Server-sanitized SVG rendered via dangerouslySetInnerHTML (mirrors MarkdownBody.tsx mermaid pattern)"
    - "TDD test cleanup: @testing-library/react cleanup() called in afterEach to prevent DOM accumulation"

key-files:
  created:
    - ui/src/pages/ContentStudio.tsx
    - ui/src/components/DiagramGeneratePanel.tsx
    - ui/src/components/DiagramPreview.tsx
    - ui/src/components/DiagramSourcePanel.tsx
    - ui/src/components/DiagramSourcePanel.test.tsx
    - ui/src/components/IconGeneratePanel.tsx
    - ui/src/components/IconResultGrid.tsx
    - ui/src/components/IconDownloadBar.tsx
    - ui/src/types/content-bundles.ts
  modified:
    - ui/src/App.tsx

key-decisions:
  - "dirty state set on onChange (not onBlur) — onBlur fires after state update from onChange may not be complete in jsdom test environment"
  - "content-bundles.ts created in ui/src/types/ — shared type contracts matching server DiagramBundle/IconSetBundle interfaces from Plan 01"
  - "Themes tab shows placeholder text — Theme UI is out of scope for Plan 41-04 (planned in 41-06)"

# Metrics
duration: 7min
completed: 2026-04-04
---

# Phase 41 Plan 04: ContentStudio Page — Diagrams and Icons UI Summary

**ContentStudio page with Diagrams and Icons tabs fully functional: prompt+type selector, generate button, SSE progress, SVG preview with download, collapsible source editor (TDD-tested), icon grid with selection and bulk download bar**

## Performance

- **Duration:** ~7 min
- **Started:** 2026-04-04T20:48:00Z
- **Completed:** 2026-04-04T20:55:27Z
- **Tasks:** 2
- **Files created/modified:** 10

## Accomplishments

- ContentStudio page registered at `/:companyId/content-studio` with 3-tab layout (Diagrams, Icons, Themes)
- DiagramGeneratePanel: full generate flow with prompt, type selector, generate button with spinner, progress bar, SVG preview, stripped-directive notice, empty state, error state
- DiagramPreview: server-sanitized SVG rendered inside paperclip-mermaid container, SVG and PNG download buttons
- DiagramSourcePanel: collapsible Mermaid source editor with copy button (aria-label), re-render button on dirty, height transition
- DiagramSourcePanel.test.tsx: 6 passing tests covering DIAG-03 requirements
- IconGeneratePanel: description + style + count selectors, generate button, progress, empty/error states
- IconResultGrid: responsive 4-col/2-col grid, per-icon checkboxes (aria-labeled), hover download row
- IconDownloadBar: sticky download bar with download selected count, format selector, clear selection

## Task Commits

1. **Task 1: ContentStudio page + Diagram UI components + DiagramSourcePanel test** - `095ba9ba` (feat)
2. **Task 2: Icon UI components (generate panel, result grid, download bar)** - `cf7784ae` (feat)

## Files Created/Modified

- `ui/src/pages/ContentStudio.tsx` - Tabbed ContentStudio page with Diagrams, Icons, Themes tabs
- `ui/src/components/DiagramGeneratePanel.tsx` - Full diagram generation flow
- `ui/src/components/DiagramPreview.tsx` - SVG preview with paperclip-mermaid container + download buttons
- `ui/src/components/DiagramSourcePanel.tsx` - Collapsible Mermaid source editor
- `ui/src/components/DiagramSourcePanel.test.tsx` - 6 TDD tests for DIAG-03 collapsible source behavior
- `ui/src/components/IconGeneratePanel.tsx` - Icon generation panel
- `ui/src/components/IconResultGrid.tsx` - Responsive icon grid with selection checkboxes and download row
- `ui/src/components/IconDownloadBar.tsx` - Sticky download bar for selected icons
- `ui/src/types/content-bundles.ts` - DiagramBundle/IconSetBundle/ThemePaletteBundle type contracts
- `ui/src/App.tsx` - Added content-studio route and ContentStudio lazy import

## Decisions Made

- dirty state in DiagramSourcePanel is set onChange rather than onBlur: in jsdom test environment, onBlur fires before the state update from onChange propagates, making the Re-render diagram button not appear reliably in tests.
- content-bundles.ts created in ui/src/types/ to give the UI its own type contract for parsing bundle JSON from content job assets. Matches server-side RenderResult union types from Plan 41-01.
- Themes tab intentionally shows placeholder: Theme UI is in scope for Plan 41-06 (ThemeEngine UI), not Plan 41-04.

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Added cleanup() to DiagramSourcePanel.test.tsx afterEach**
- **Found during:** Task 1 (GREEN phase test run)
- **Issue:** @testing-library/react does not auto-cleanup between tests in vitest jsdom environment without explicit cleanup() call. Multiple test instances accumulated in the DOM, causing getByText("View Mermaid source") to find multiple elements.
- **Fix:** Added cleanup() import and call in afterEach hook.
- **Files modified:** ui/src/components/DiagramSourcePanel.test.tsx
- **Commit:** 095ba9ba

**2. [Rule 1 - Bug] Moved dirty state to onChange instead of onBlur in DiagramSourcePanel**
- **Found during:** Task 1 (GREEN phase tests for Re-render button failing)
- **Issue:** onBlur handler checking editedSource !== mermaidSource fires correctly in browser, but in jsdom test environment with fireEvent.change + fireEvent.blur, the state from onChange has not yet been applied when onBlur runs synchronously.
- **Fix:** Set dirty state directly in onChange handler by comparing new value to mermaidSource prop.
- **Files modified:** ui/src/components/DiagramSourcePanel.tsx
- **Commit:** 095ba9ba

---

**Total deviations:** 2 auto-fixed (Rule 1 - bugs found during TDD GREEN phase)
**Impact on plan:** No scope change. Both fixes are in the test infrastructure and component implementation to ensure reliable test assertions.

## Known Stubs

- `ui/src/pages/ContentStudio.tsx` Themes tab: shows "Theme engine coming soon." — intentional placeholder. Theme UI is out of scope for Plan 41-04 and will be implemented in Plan 41-06.

## User Setup Required

None — UI components are static React components consuming existing hooks and APIs.

## Next Phase Readiness

- Plans 41-05 and 41-06 can now reference ContentStudio.tsx for Themes tab implementation
- DiagramSourcePanel test pattern (@testing-library/react + cleanup() in afterEach) established for future component tests
- content-bundles.ts type contracts ready for Theme palette bundle UI parsing in Plan 41-06

---
*Phase: 41-diagrams-icons-theme-engine*
*Completed: 2026-04-04*
