# Proof Studio with What-If Slider and Confidence Factors

## Module
Web

## Status
VERIFIED

## Description
Interactive proof studio for exploring confidence scores with a "what-if" slider for simulating evidence changes, confidence breakdown visualization showing contributing factors as bar charts, and confidence factor chips for individual factor display.

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/proof-studio/`
- **Components**:
  - `confidence-breakdown` (`src/Web/StellaOps.Web/src/app/features/proof-studio/components/confidence-breakdown/confidence-breakdown.component.ts`)
  - `confidence-factor-chip` (`src/Web/StellaOps.Web/src/app/features/proof-studio/components/confidence-factor-chip/confidence-factor-chip.component.ts`)
  - `proof-studio-container` (`src/Web/StellaOps.Web/src/app/features/proof-studio/components/proof-studio-container/proof-studio-container.component.ts`)
  - `what-if-slider` (`src/Web/StellaOps.Web/src/app/features/proof-studio/components/what-if-slider/what-if-slider.component.ts`)
- **Services**:
  - `proof-studio` (`src/Web/StellaOps.Web/src/app/features/proof-studio/services/proof-studio.service.ts`)
- **Models**:
  - `src/Web/StellaOps.Web/src/app/features/proof-studio/models/proof-trace.model.ts`
- **Source**: Feature matrix scan

## E2E Test Plan
- **Setup**:
  - [ ] Log in with a user that has appropriate permissions
  - [ ] Navigate to `/proofs/:subjectDigest`
  - [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
- **Core verification**:
  - [ ] Verify the editor/studio loads with editable content or empty template
  - [ ] Verify changes can be saved and persisted
  - [ ] Verify validation errors are displayed for invalid input
- **Edge cases**:
  - [ ] Verify graceful handling when backend API is unavailable (error state)
  - [ ] Verify responsive layout at different viewport sizes
  - [ ] Verify accessibility (keyboard navigation, screen reader labels, ARIA attributes)

## Verification
- Run: `docs/qa/feature-checks/runs/web/proof-studio-with-what-if-slider-and-confidence-factors/run-001/`
- Date (UTC): 2026-02-11