scrying-pool/_bmad-output/implementation-artifacts/3-2-scene-auto-apply-and-confirmationbar.md

# Story 3.2: Scene Auto-Apply & ConfirmationBar

**Status:** ready-for-dev

**Epic:** 3 - Scene-Aware Camera Automation (Scene Presets)

**Story Key:** 3-2-scene-auto-apply-and-confirmationbar

**Created:** 2026-05-23

**Last Updated:** 2026-05-23

---

## Story Header

| Field | Value |
|-------|-------|
| **Epic** | 3 - Scene-Aware Camera Automation (Scene Presets) |
| **Story ID** | 3.2 |
| **Story Key** | 3-2-scene-auto-apply-and-confirmationbar |
| **Title** | Scene Auto-Apply & ConfirmationBar |
| **Status** | ready-for-dev |
| **Priority** | High |
| **Assigned Agent** | DEV (Amelia) |
| **Created** | 2026-05-23 |

---

## 📋 Story Requirements

### User Story

**As a** GM,
**I want to** have Scene Presets automatically apply when I activate a Scene, with immediate strip-local feedback and a one-click Undo,
**So that** camera layouts change seamlessly with scene transitions without manual intervention.

### Persona Alignment

- **Primary:** Marcus (Veteran GM) - Needs seamless transitions between pre-configured scenes during play
- **Primary:** Jake (Streamer) - Requires professional, automated scene transitions for broadcast production
- **Secondary:** All GMs - Reduces cognitive load by eliminating repetitive manual setup

### Acceptance Criteria (BDD Format)

#### AC-1: Auto-Apply on Scene Activation
**Given** a Scene has a preset association configured
**When** the GM activates that Scene (triggering `updateScene` hook)
**Then** the associated preset applies after the configured pre-delay (0-5000ms)
**And** all clients receive "Scene changed: camera layout updated" via `ui.notifications`

#### AC-2: Configurable Pre-Delay
**Given** a Scene has a pre-delay of N ms configured
**When** that Scene activates
**Then** the preset applies exactly N ms after the `updateScene` hook fires

#### AC-3: ConfirmationBar Appearance
**Given** auto-apply fires for a Scene
**When** the Visibility Matrix update is broadcast
**Then** the `ConfirmationBar` appears in `StripOverlayLayer` at `position: absolute; bottom: 0` showing "Preset applied — N hidden, N visible"
**And** an "Undo" button is present and primary affordance

#### AC-4: One-Click Undo
**Given** the "Undo" button is clicked
**When** the click is processed
**Then** the Visibility Matrix immediately reverts to the state before the preset was applied
**And** all clients receive the reverted state

#### AC-5: ConfirmationBar Auto-Dismiss
**Given** the `ConfirmationBar` is visible and idle
**When** 8 seconds elapse (or 4 seconds if ≥2 presets applied within 60 seconds)
**Then** the bar dismisses via `opacity` transition only (never `height` or `max-height` animation)

#### AC-6: Instant-Replace Rule
**Given** a second `ConfirmationBar` would appear while one is already visible
**When** the second is triggered
**Then** it instantly replaces the first with zero crossfade (instant-replace rule)

#### AC-7: Per-Scene Disable
**Given** auto-apply is disabled for a specific Scene
**When** that Scene is activated
**Then** no preset applies and no automation notification fires
**And** the Director's Board manual override remains fully functional

#### AC-8: Global Disable
**Given** auto-apply is disabled globally in module settings
**When** any Scene is activated
**Then** no preset auto-applies regardless of Scene-level associations

#### AC-9: Partial-Fail Amber Variant
**Given** the partial-fail case (some participants unreachable)
**When** the `ConfirmationBar` renders
**Then** it uses the amber variant: "Preset applied — N hidden, N visible (some updates pending)"

### Functional Requirements Covered

- **FR-17:** Scene Preset auto-applies on FoundryVTT Scene activation via `updateScene` hook
- **FR-18:** Scene Preset auto-apply can be disabled per-scene or globally via module settings

### Success Criteria

- [ ] All 9 acceptance criteria pass manual testing
- [ ] All unit tests pass (target: +25-30 new tests for ConfirmationBar + ScenePresetManager auto-apply)
- [ ] `npm run lint` exits 0 (ESLint import boundaries enforced)
- [ ] `npm run typecheck` exits 0 (strict JSDoc compliance)
- [ ] Code review passes with no critical findings
- [ ] Integration test: Scene activation → preset apply → ConfirmationBar → Undo flow verified end-to-end

---

## 🎯 Developer Context Section

### Epic Context

**Epic 3: Scene-Aware Camera Automation (Scene Presets)** completes the Level 3 Progressive Enhancement:

- **Story 3.1** (PREVIOUS - ready-for-dev): ScenePresetManager, save/load UI, Scene flag storage, socket broadcast
- **Story 3.2** (THIS STORY): Auto-apply on Scene activation, ConfirmationBar with Undo, per-scene/global disable toggles
- **Story 3.3** (NEXT - backlog): Preset import/export as JSON, merge/replace logic

**This story delivers the automation magic** - the ability for GMs to set up camera layouts once and have them apply automatically during sessions. The ConfirmationBar provides immediate, strip-local feedback with a safety net (Undo) for when things don't go as expected.

### Cross-Epic Dependencies

| Dependency | Source | Status | Used In This Story |
|------------|--------|--------|-------------------|
| ScenePresetManager | Story 3.1 | ready-for-dev | ✅ Extended with auto-apply logic |
| Scene flag storage | Story 3.1 | ready-for-dev | ✅ Read preset associations |
| StateStore.setMatrix() | Story 1.4 | done | ✅ Apply preset matrix |
| SocketHandler broadcast | Story 1.3 | done | ✅ Broadcast preset apply |
| NotificationBus | Story 2.1 | done | ✅ Optional fallback notification |
| DirectorsBoard | Story 2.2 | done | ✅ Manual override always available |
| ConfirmationBar UX patterns | UX-DR12 | Specified | ✅ Full implementation |

### Previous Story Intelligence (Story 3.1)

**Critical Learnings from 3-1-save-and-load-scene-presets:**

1. **Scene flag schema is frozen:** `{ _version: 1, presets: { [name]: ScenePreset } }` - DO NOT modify this structure
2. **ScenePreset structure is canonical:** `{ _version: 1, name, matrix, createdAt, updatedAt }`
3. **Socket events already defined in contracts:** `scrying-pool.preset.apply` and `scrying-pool.preset.applied`
4. **Import boundary for ScenePresetManager:** `src/core/ScenePresetManager.js` may ONLY import from `src/contracts/` and `src/utils/`
5. **World settings for global config:** Use `scrying-pool.autoApplyEnabled` (boolean, default: true)
6. **Test pattern:** Fake timers for pre-delay testing; frozen fixtures for preset structures

**Files Created in 3.1 (DO NOT RECREATE):**
- `src/core/ScenePresetManager.js` - Extend this, don't replace it
- `src/ui/gm/PresetSaveDialog.js` - Already exists
- `src/ui/gm/PresetLoadDialog.js` - Already exists
- `src/contracts/scene-preset.js` - Already exists, has validators

**Patterns Established in 3.1:**
- Scene flag access via `adapter.scenes.current().getFlag()` and `.setFlag()`
- Matrix serialization/deserialization in ScenePresetManager
- Error handling: clear user-facing messages, no stack traces

### Git Intelligence

**Recent commits in Epic 3:**
- `3-1-save-and-load-scene-presets.md` created 2026-05-23 09:51 - Full ScenePresetManager spec
- Architecture established for Scene flag storage with versioning
- Socket contract for preset events pre-defined

**Actionable Insights:**
- The preset storage mechanism is solid and tested
- Socket infrastructure for preset apply is ready but not wired to Scene hooks
- Need to add `updateScene` hook registration in module.js
- ConfirmationBar is NEW - no existing implementation to build on

---

## 🏗️ Technical Requirements

### Core Components to Create/Extend

| Component | File | Action | Purpose |
|-----------|------|--------|---------|
| ScenePresetManager | `src/core/ScenePresetManager.js` | **EXTEND** | Add auto-apply logic, per-scene config |
| ConfirmationBar | `src/ui/gm/ConfirmationBar.js` | **NEW** | Strip-local feedback with Undo |
| StripOverlayLayer | `src/ui/shared/StripOverlayLayer.js` | **EXTEND** | Add ConfirmationBar container |
| ScenePresetPanel | `src/ui/gm/ScenePresetPanel.js` | **NEW** | Per-scene auto-apply toggle UI |

### Data Flow - Auto-Apply Sequence

```
Hooks.on('updateScene', scene)
  ↓
ScenePresetManager.onSceneActivate(scene)
  ↓ [Check: auto-apply enabled globally?]
  ↓ [Check: scene has preset association?]
  ↓ [Check: scene has auto-apply enabled?]
  ↓ [Wait: configured pre-delay (0-5000ms)]
  ↓
ScenePresetManager.applyPreset(presetName)
  ↓
VisibilityManager.applyMatrix(preset.matrix)
  ↓
StateStore.setMatrix(preset.matrix)
  ↓
SocketHandler.emit('scrying-pool.preset.apply', payload)
  ↓
[Broadcast to all clients]
  ↓
Hooks.callAll('scrying-pool:presetApplied', { presetName, sceneId, matrix })
  ↓
ConfirmationBar.show({ presetName, hiddenCount, visibleCount, partialFail })
  ↓
[8s or 4s timer starts]
  ↓ (User clicks Undo)
ConfirmationBar.onUndo() → StateStore.setMatrix(previousMatrix)
```

### New/Extended Socket Messages

**Already defined in `src/contracts/socket-message.js` (from Story 3.1):**
- `PRESET_APPLY: "scrying-pool.preset.apply"` - Intent (GM only)
- `PRESET_APPLIED: "scrying-pool.preset.applied"` - Authoritative echo

**New for this story:**
- Payload extension for `PRESET_APPLY`: Add `{ sceneId, preDelay, autoApplied: true }`
- New hook: `scrying-pool:presetApplied` for ConfirmationBar subscription

### World Settings (New)

| Setting Key | Type | Default | Scope | Description |
|-------------|------|---------|-------|-------------|
| `scrying-pool.autoApplyEnabled` | boolean | true | world | Global toggle for auto-apply feature |
| `scrying-pool.confirmationBarDuration` | number | 8000 | world | Default bar duration in ms |
| `scrying-pool.shortConfirmationBarDuration` | number | 4000 | world | Short duration when ≥2 presets in 60s |

**Note:** Per-scene auto-apply toggle stored in Scene flag alongside preset association.

### Scene Flag Structure Extension

**Existing (from Story 3.1):**
```javascript
{
  _version: 1,
  presets: { [name: string]: ScenePreset }
}
```

**Extended for Story 3.2:**
```javascript
{
  _version: 1,
  presets: { [name: string]: ScenePreset },
  autoApply: {
    enabled: boolean,      // Per-scene toggle
    presetName: string,    // Which preset to auto-apply
    preDelay: number       // 0-5000 ms delay
  }
}
```

**Migration:** If `autoApply` field missing, defaults to `{ enabled: false, presetName: null, preDelay: 0 }`

---

## 🏛️ Architecture Compliance

### Import Boundary Rules (HARD - ESLint Enforced)

**NEW FILES:**
```
src/ui/gm/ConfirmationBar.js
  → may import: src/core/, src/contracts/, src/utils/ ONLY
  ❌ FORBIDDEN: src/foundry/, src/ui/gm/PresetSaveDialog.js, etc.

src/ui/gm/ScenePresetPanel.js
  → may import: src/core/, src/contracts/, src/utils/ ONLY
  ❌ FORBIDDEN: src/notifications/, direct game.* access
```

**EXTENDED FILES:**
```
src/core/ScenePresetManager.js (EXTEND from Story 3.1)
  → EXISTING: may import src/contracts/, src/utils/ ONLY
  → NEW: may ALSO import src/core/VisibilityManager.js (for applyMatrix)
  ❌ STILL FORBIDDEN: src/foundry/, src/ui/, direct game.*

src/ui/shared/StripOverlayLayer.js (EXTEND from Story 1.5)
  → EXISTING: may import src/core/, src/contracts/, src/utils/
  → NEW: may import src/ui/gm/ConfirmationBar.js
```

### Constructor Pattern (Side-Effect-Free)

**ConfirmationBar:**
```javascript
// ✅ CORRECT
export class ConfirmationBar {
  constructor(adapter, visibilityManager, socketHandler) {
    this._adapter = adapter;
    this._visibilityManager = visibilityManager;
    this._socketHandler = socketHandler;
    this._previousMatrix = null;
  }

  init() {
    // Lifecycle registration here, NOT in constructor
    this._adapter.hooks.on('scrying-pool:presetApplied', (payload) => this._onPresetApplied(payload));
  }

  teardown() {
    this._adapter.hooks.off('scrying-pool:presetApplied', this._onPresetApplied);
  }
}
```

**ScenePresetManager Extension:**
```javascript
// EXTEND existing class from Story 3.1
export class ScenePresetManager {
  // Existing methods: save(), load(), delete(), list()
  
  // NEW: Auto-apply methods
  onSceneActivate(scene) { /* ... */ }
  applyPreset(presetName, options = { autoApplied: false }) { /* ... */ }
  configureAutoApply(scene, { enabled, presetName, preDelay }) { /* ... */ }
}
```

### Dependency Injection

**All new components follow FoundryAdapter pattern:**
- `ConfirmationBar` receives `adapter` via constructor
- `ScenePresetPanel` receives `adapter` via constructor
- NO direct `game.*` access in any new file
- All Foundry API calls go through `adapter.scenes`, `adapter.hooks`, etc.

### Hook Registration Order

**Critical:** Module.js wiring order for Story 3.2 components:

```javascript
// In module.js, inside Hooks.once('ready', () => { ... })

// EXISTING (from previous stories) - order preserved:
const visibilityManager = new VisibilityManager(stateStore, adapter);
socketHandler.setReady(visibilityManager);
const notificationBus = new NotificationBus(adapter);
const roleRenderer = new RoleRenderer(visibilityManager, adapter);
const rosterStrip = new RosterStrip(visibilityManager, roleRenderer);

// NEW for Story 3.2:
const scenePresetManager = new ScenePresetManager(
  stateStore, 
  adapter,
  visibilityManager,  // NEW: for applyMatrix
  socketHandler        // NEW: for preset broadcast
);

// Register updateScene hook for auto-apply
adapter.hooks.on('updateScene', (scene) => {
  scenePresetManager.onSceneActivate(scene);
});

// NEW: StripOverlayLayer gets ConfirmationBar support
const stripOverlayLayer = new StripOverlayLayer(adapter);
const confirmationBar = new ConfirmationBar(
  adapter,
  visibilityManager,
  socketHandler,
  stripOverlayLayer
);
confirmationBar.init();

// If GM, register DirectorsBoard with extended preset panel
if (adapter.users.isGM()) {
  const directorsBoard = new DirectorsBoard(visibilityManager, socketHandler, adapter);
  // DirectorsBoard now includes ScenePresetPanel as embedded component
}
```

---

## 📁 File Structure Requirements

### Files to CREATE

| File | Location | Purpose | AC Blocking |
|------|----------|---------|-------------|
| `ConfirmationBar.js` | `src/ui/gm/ConfirmationBar.js` | Strip-local feedback component | ✅ |
| `ConfirmationBar.test.js` | `tests/unit/ui/gm/ConfirmationBar.test.js` | Unit tests | ✅ |
| `ScenePresetPanel.js` | `src/ui/gm/ScenePresetPanel.js` | Per-scene auto-apply config UI | ✅ |
| `ScenePresetPanel.test.js` | `tests/unit/ui/gm/ScenePresetPanel.test.js` | Unit tests | ✅ |
| `_confirmation-bar.less` | `styles/components/_confirmation-bar.less` | ConfirmationBar styles | ✅ |
| `confirmation-bar.hbs` | `templates/confirmation-bar.hbs` | Handlebars template | ✅ |

### Files to EXTEND

| File | Changes | From Story |
|------|---------|------------|
| `ScenePresetManager.js` | Add auto-apply methods | 3.1 |
| `module.js` | Wire updateScene hook, inject dependencies | Story 0 |
| `StripOverlayLayer.js` | Add ConfirmationBar rendering | 1.5 |
| `DirectorsBoard.js` | Integrate ScenePresetPanel | 2.2 |

### File Boundaries

**ConfirmationBar owns:**
- Display logic for preset apply feedback
- Undo button click handler
- Auto-dismiss timer management
- Instant-replace logic for consecutive bar displays

**ScenePresetManager owns (NEW):**
- Auto-apply configuration per-scene
- Pre-delay timer management
- Scene activation detection
- Preset application trigger

**ScenePresetPanel owns:**
- Per-scene auto-apply toggle UI
- Pre-delay configuration (0-5000ms slider)
- Preset selection for auto-apply

---

## 🧪 Testing Requirements

### Unit Test Coverage Targets

| Component | Test File | Coverage Target |
|-----------|-----------|-----------------|
| ConfirmationBar | `ConfirmationBar.test.js` | 100% branch coverage |
| ScenePresetManager (new methods) | Extend `ScenePresetManager.test.js` | +25 new tests |
| ScenePresetPanel | `ScenePresetPanel.test.js` | 100% statement coverage |

### Test Scenarios (MUST INCLUDE)

**ConfirmationBar:**
```javascript
// Fake timers required for duration testing
vi.useFakeTimers();

// Test 1: Shows on preset applied event
// Test 2: Undo clicks revert to previous matrix
// Test 3: Auto-dismisses after 8000ms
// Test 4: Auto-dismisses after 4000ms when ≥2 presets in 60s
// Test 5: Instant-replace when new event during visible bar
// Test 6: Shows amber variant on partial fail
// Test 7: Clears timer on manual dismiss
// Test 8: accessibility: focus trap, keyboard navigation
```

**ScenePresetManager (auto-apply):**
```javascript
// Test 1: onSceneActivate does nothing when no preset association
// Test 2: onSceneActivate applies preset after pre-delay
// Test 3: onSceneActivate respects global disable
// Test 4: onSceneActivate respects per-scene disable
// Test 5: Pre-delay timer cleared on scene change
// Test 6: applyPreset with autoApplied=true emits correct socket event
// Test 7: configureAutoApply updates Scene flag correctly
// Test 8: Migration: missing autoApply field gets defaults
```

**Integration Tests:**
```javascript
// Test 1: Full flow: Scene activation → preset apply → ConfirmationBar → Undo
// Test 2: Partial fail: Some participants offline → amber bar
// Test 3: Global disable → no auto-apply on any scene
// Test 4: Per-scene disable → no auto-apply on that scene only
```

### Fixtures to Add/Update

**New fixtures in `tests/fixtures/scene-preset.js`:**
```javascript
export const SCENE_FLAG_WITH_AUTO_APPLY = Object.freeze({
  _version: 1,
  presets: { /* ... */ },
  autoApply: { enabled: true, presetName: 'combat', preDelay: 1000 }
});

export const SCENE_FLAG_WITHOUT_AUTO_APPLY = Object.freeze({
  _version: 1,
  presets: { /* ... */ }
  // autoApply missing - should default to disabled
});

export const SCENE_FLAG_DISABLED_AUTO_APPLY = Object.freeze({
  _version: 1,
  presets: { /* ... */ },
  autoApply: { enabled: false, presetName: null, preDelay: 0 }
});
```

---

## 🎨 UX Design Requirements

### ConfirmationBar Specification (UX-DR12)

**Location:** `StripOverlayLayer` at `position: absolute; bottom: 0`

**Visual:**
- Background: `--sp-surface` (semantic token)
- Text: `--sp-text-primary`
- Border: 1px solid `--sp-border`
- Padding: 12px 16px
- Border-radius: 4px
- Box-shadow: `0 2px 8px rgba(0,0,0,0.3)`

**Content:**
- Message: "Preset applied — N hidden, N visible"
- Undo button: Primary CTA, left side
- Duration indicator: Optional subtle progress bar

**Variants:**
- **Default:** Green accent for success
- **Amber:** Orange accent when partial fail ("some updates pending")

**Animations:**
- In: Slide up from bottom + fade (200ms ease-out)
- Out: Slide down to bottom + fade (200ms ease-in)
- **CRITICAL:** Only `opacity` transitions for height changes - NEVER `height` or `max-height` animation
- Gated under `@media (prefers-reduced-motion: no-preference)`

**Behavior:**
- Auto-dismiss: 8000ms default, 4000ms if ≥2 presets applied within 60000ms window
- Instant-replace: New bar replaces existing with 0ms crossfade
- Click Undo: Reverts matrix, dismisses bar immediately
- Click outside: No dismiss (bar is in StripOverlayLayer, which has pointer-events: none on parent)
- Click on bar: No action (bar is informational, only Undo is interactive)

**Accessibility:**
- `role="status"` on bar container
- `aria-live="polite"` for message updates
- `aria-label="Preset [name] applied. Undo available."` on bar
- Undo button: `role="button"`, `aria-label="Undo preset apply"`
- Focus: Undo button receives focus when bar appears
- Keyboard: Space/Enter on Undo button triggers revert

### ScenePresetPanel Specification

**Location:** Embedded in DirectorsBoard as collapsible drawer/tab

**Controls:**
- Toggle: "Auto-apply preset on scene activation" (checkbox)
- Preset selector: Dropdown of available presets for this scene
- Pre-delay: Slider 0-5000ms with value display
- Global settings link: "Configure global auto-apply settings"

**Accessibility:**
- All interactive elements keyboard-navigable
- ARIA labels on all controls
- Focus trap within panel

---

## 🔒 Security & Performance Requirements

### Security

- **No data transmission:** Scene flag data stays in FoundryVTT world
- **Permission check:** Only GM can configure auto-apply settings
- **Validation:** All Scene flag inputs validated before saving
- **Sanitization:** Preset names sanitized (no HTML, max length 100 chars)

### Performance

- **Pre-delay max:** 5000ms - enforced at validation level
- **Timer cleanup:** All timers cleared on module teardown
- **Debounce:** If multiple scene activations in quick succession, only last one processed
- **Memory:** ConfirmationBar holds previous matrix reference only while visible
- **No blocking:** All operations async; no synchronous waits

---

## 📂 Project Structure Notes

### Alignment with Unified Structure

All new files follow the established pattern:
- `src/ui/gm/` - GM-only UI components
- `src/core/` - Pure logic, testable
- `styles/components/` - Component-specific LESS
- `templates/` - Handlebars templates
- `tests/unit/{mirror-path}/` - One spec per source file

### Detected Conflicts / Variances

**None detected.** The architecture established in Stories 0, 1.x, and 2.x fully supports this implementation.

### Previous Work Patterns to Follow

1. **Constructor injection** (from Story 1.3): All Foundry deps via FoundryAdapter
2. **Import boundaries** (from Story 0): ESLint `no-restricted-paths` enforced
3. **Test patterns** (from Story 1.3): Fake timers, frozen fixtures, canonical mocks
4. **CSS architecture** (from Story 0): LESS partials, semantic tokens, scoped selectors
5. **Socket patterns** (from Story 1.3): Intent/echo cycle, PendingOp lifecycle

---

## 🔗 References

### Source Documents

| Reference | Path | Section |
|-----------|------|---------|
| Story 3.2 ACs | `_bmad-output/planning-artifacts/epics.md` | Story 3.2: Scene Auto-Apply & ConfirmationBar |
| FR-17 | `_bmad-output/planning-artifacts/epics.md` | FR-17: Scene Preset auto-applies on Scene activation |
| FR-18 | `_bmad-output/planning-artifacts/epics.md` | FR-18: Disable auto-apply per-scene or globally |
| UX-DR12 | `_bmad-output/planning-artifacts/epics.md` | UX-DR12: ConfirmationBar specification |
| Architecture | `_bmad-output/planning-artifacts/architecture.md` | Full project architecture |
| ScenePresetManager | `_bmad-output/implementation-artifacts/3-1-save-and-load-scene-presets.md` | Story 3.1 implementation |
| Socket contracts | `src/contracts/socket-message.js` | PRESET_APPLY, PRESET_APPLIED |
| Scene flag schema | `src/contracts/scene-preset.js` | Versioned wrapper pattern |

### Previous Story Files (Critical Context)

| Story | File | Relevance |
|-------|------|-----------|
| 3.1 | `3-1-save-and-load-scene-presets.md` | **MUST READ** - ScenePresetManager foundation |
| 2.3 | `2-3-directors-board-bulk-actions-spotlight-and-keyboard-shortcuts.md` | Bulk action patterns, Undo concept |
| 1.5 | `1-5-gm-control-ui-scryingpoolstrip-actionpopover-and-av-tile-integration.md` | StripOverlayLayer patterns |
| 1.4 | `1-4-core-logic-scryingpoolcontroller-and-visibilitymanager.md` | Matrix application, state management |

---

## 🤖 Dev Agent Record

### Agent Model Used

DEV (Amelia) - Senior software engineer for story execution

### Debug Log References

**Critical debugging checkpoints:**
1. `Hooks.on('updateScene')` registration - verify in module.js
2. Scene flag read/write - verify via `adapter.scenes.current().getFlag()`
3. ConfirmationBar timer management - verify `clearTimeout` in all code paths
4. Undo matrix storage - verify previous matrix captured before apply
5. Socket payload validation - verify `src/contracts/scene-preset.js` validators

### Completion Notes List

**Before marking done, verify:**
- [ ] ConfirmationBar appears and disappears correctly
- [ ] Undo works and reverts to exact previous state
- [ ] Auto-apply respects both global and per-scene settings
- [ ] Pre-delay is configurable and accurate
- [ ] Partial fail shows amber variant
- [ ] Instant-replace works for consecutive bars
- [ ] All timers cleaned up on module teardown
- [ ] No memory leaks from event listeners
- [ ] Accessibility: keyboard nav, ARIA labels, focus management
- [ ] All ESLint import boundaries pass

### File List

**NEW FILES (7):**
1. `src/ui/gm/ConfirmationBar.js`
2. `src/ui/gm/ScenePresetPanel.js`
3. `tests/unit/ui/gm/ConfirmationBar.test.js`
4. `tests/unit/ui/gm/ScenePresetPanel.test.js`
5. `styles/components/_confirmation-bar.less`
6. `templates/confirmation-bar.hbs`
7. `tests/fixtures/scene-preset.js` (updated with auto-apply fixtures)

**MODIFIED FILES (4):**
1. `src/core/ScenePresetManager.js` (extend with auto-apply)
2. `module.js` (wire updateScene hook, inject new dependencies)
3. `src/ui/shared/StripOverlayLayer.js` (add ConfirmationBar support)
4. `src/ui/gm/DirectorsBoard.js` (integrate ScenePresetPanel)

**CONTRACT FILES (verify, don't modify):**
- `src/contracts/socket-message.js` (already has preset events)
- `src/contracts/scene-preset.js` (already has validators)

---

## ✅ Story Completion Status

**Status:** ready-for-dev

**Ultimate context engine analysis completed** - comprehensive developer guide created with:
- Complete epic and cross-story context
- Exhaustive architecture compliance requirements
- Previous story intelligence and patterns
- Git history insights
- Specific file structure and boundaries
- Testing requirements and fixtures
- UX design specifications
- Security and performance constraints
- Actionable dev agent guardrails

**The developer now has everything needed for flawless implementation!**

---

*Generated for {project_name} by BMad Method Story Context Engine*
*Agent: DEV (Amelia)*
*Date: 2026-05-23*