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# Implementation Summary

**Session ID**: `phase21-session04-shortcut-and-overlay-layering` **Package**: apps/web **Completed**: 2026-06-29 **Duration**: 0.5 hours

***

## Overview

Completed the shortcut and overlay layering pass for the Orchestration focused bottom-rail surface. The `o d` shortcut now opens the focused Command Center surface, shortcut help uses Command Center working-surface copy, and nested Orchestration overlays use a shared layer convention so Escape closes the top layer before the expanded surface.

***

## Deliverables

### Files Created

| File                                | Purpose                                                                     | Lines |
| ----------------------------------- | --------------------------------------------------------------------------- | ----- |
| `apps/web/src/lib/overlayLayers.ts` | Shared overlay layer names, marker attributes, ordering, and query helpers. | 74    |

### Files Modified

| File                                                                  | Changes                                                                                                                            |
| --------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
| `apps/web/src/components/BottomRailExpansionHost.tsx`                 | Added bottom-rail overlay markers, shared z-index class use, and higher-layer Escape guard.                                        |
| `apps/web/src/components/orchestration/OrchestrationCurrentState.tsx` | Marked the retained state summary portal as a higher overlay layer.                                                                |
| `apps/web/src/components/orchestration/OrchestrationDrawer.tsx`       | Marked command-center drawers as higher overlay layers and gated Escape by top layer.                                              |
| `apps/web/src/components/orchestration/TerminalRuntimeDrawer.tsx`     | Marked terminal runtime drawers as higher overlay layers and gated Escape by top layer.                                            |
| `apps/web/src/components/orchestration/ExecutorRunHistoryDrawer.tsx`  | Marked execution-history drawers as higher overlay layers and gated Escape by top layer.                                           |
| `apps/web/src/components/orchestration/OrchestrationShell.tsx`        | Routed the primary Command Center shortcut to the focused surface opener while retaining state summary as secondary.               |
| `apps/web/src/lib/commandCenterShortcuts.ts`                          | Replaced details-primary metadata with Command Center working-surface action, labels, and ARIA copy.                               |
| `apps/web/src/lib/useKeyboardShortcuts.ts`                            | Updated global shortcut dispatch for the renamed Command Center action.                                                            |
| `apps/web/tests/commandCenterShortcuts.test.ts`                       | Updated pure shortcut route, copy, uniqueness, and ARIA assertions.                                                                |
| `apps/web/tests/keyboardShortcuts.test.ts`                            | Updated route and DOM dispatch expectations for the primary Command Center shortcut.                                               |
| `apps/web/tests/KeyboardShortcutsModal.test.tsx`                      | Updated visible and accessible shortcut modal copy.                                                                                |
| `apps/web/tests/BottomRailExpansionHost.test.tsx`                     | Added higher-layer Escape, backdrop close, inner-panel containment, and z-index contract coverage.                                 |
| `apps/web/tests/OrchestrationPanel.test.tsx`                          | Added runtime shortcut dispatch and nested Escape-order regressions for state summary, command-center drawer, and terminal drawer. |

***

## Technical Decisions

1. **Shared overlay layer helper**: Centralized layer names, ranks, marker attributes, and z-index classes so parent and child overlay behavior is deterministic.
2. **Primary shortcut opens focused work surface**: Replaced the old details-primary action path because Phase 21 requires the primary Orchestration open action to expose the usable Command Center surface.
3. **Top-layer Escape guards**: Nested overlays close only when they are topmost, and the bottom-rail host defers when a higher layer exists.

***

## Test Results

| Metric         | Value                                   |
| -------------- | --------------------------------------- |
| Focused tests  | 133 passed                              |
| Full web tests | 2073 passed                             |
| Root tests     | 3149 passed, 1 skipped                  |
| Typecheck      | PASS                                    |
| Format         | PASS                                    |
| Lint           | PASS                                    |
| Coverage       | Not reported by invoked Vitest commands |

***

## Lessons Learned

1. Shared DOM layer metadata avoids fragile component-specific Escape exceptions.
2. Shortcut names and help copy should match the actual primary user outcome, not older implementation detail language.
3. Visual stacking and logical Escape order need to be tested together when overlays cross portal and fixed-layout boundaries.

***

## Future Considerations

Items for future sessions:

1. Apply the same focused-surface parity expectations to Quest Board and War Room.
2. Verify responsive desktop and small-viewport behavior after all bottom-rail panels share the focused-surface contract.
3. Fold final behavior into stable docs during Phase 21 documentation closeout.

***

## Session Statistics

* **Tasks**: 21 completed
* **Files Created**: 1
* **Files Modified**: 13
* **Tests Added**: Focused assertions across 5 existing test files
* **Blockers**: 0 resolved


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