docs(05-03): complete keyboard shortcuts plan — SUMMARY, STATE, ROADMAP updated

.planning/phases/05-live-show-execution/05-03-SUMMARY.md

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+---
+phase: 05-live-show-execution
+plan: 03
+subsystem: ui
+tags: [keyboard-shortcuts, vanilla-js, undo-redo, audio, websocket]
+
+# Dependency graph
+requires:
+  - phase: 05-01
+    provides: "Cue scheduler backend for play/pause/seek server messages"
+  - phase: 05-02
+    provides: "Preview strips for seek-clear pattern"
+provides:
+  - "wireKeyboard() — all 7 keyboard bindings (Space, ArrowLeft, ArrowRight, Ctrl+Z, Ctrl+Shift+Z, Ctrl+Y, Ctrl+S)"
+  - "Mouse-free operation of all primary actions per UI-03 requirement"
+affects: []
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Keyboard guard pattern: check activeElement tagName before acting (input/select/textarea bypass)"
+    - "Space-on-button guard: explicit check for tag === 'button' to prevent double-toggle"
+    - "Ctrl+S round-trip save: GET current show state → POST to /api/shows (manual trigger)"
+    - "Arrow seek with strip clear: same clear pattern as mouseup seek from Plan 02"
+
+key-files:
+  created: []
+  modified:
+    - lightsync/frontend/app.js
+
+key-decisions:
+  - "e.preventDefault() called first in every branch — suppresses Space scroll, Arrow scroll, Ctrl+S browser dialog before any logic"
+  - "Space explicitly guarded on button elements to avoid double-toggle with button click handler"
+  - "Ctrl+S uses GET-then-POST round-trip (reads current server state, not just timeline) — consistent with existing save pattern"
+
+patterns-established:
+  - "wireKeyboard() placed after wireAudio() in init section — both audio wiring functions called together at startup"
+  - "Arrow seek clears preview strips inline — same pattern as mouseup seek handler"
+
+requirements-completed: [UI-03]
+
+# Metrics
+duration: 10min
+completed: 2026-04-07
+---
+
+# Phase 05 Plan 03: Keyboard Shortcuts Summary
+
+**wireKeyboard() function wired with all 7 keyboard bindings (Space play/pause, Arrow seek, Ctrl+Z/Y undo/redo, Ctrl+S save) — all primary operations accessible without mouse**
+
+## Performance
+
+- **Duration:** ~10 min
+- **Completed:** 2026-04-07
+- **Tasks:** 1
+- **Files modified:** 1
+
+## Accomplishments
+
+- Added `wireKeyboard()` function to `lightsync/frontend/app.js` (72 lines inserted)
+- Space toggles audio play/pause and sends `{ type: 'play' }` or `{ type: 'pause' }` to server via WebSocket
+- ArrowLeft seeks back 5 seconds, ArrowRight seeks forward 5 seconds — both send `{ type: 'seek', position }` to server and clear all preview strips
+- Ctrl+Z calls `timeline?.history.undo()` via optional chaining (safe when timeline not yet initialized)
+- Ctrl+Shift+Z and Ctrl+Y both call `timeline?.history.redo()`
+- Ctrl+S prevents browser Save dialog via `e.preventDefault()`, then fetches current show and POSTs it back to `/api/shows`
+- All shortcuts are suppressed when `document.activeElement` is an `input`, `select`, or `textarea`
+- Space is additionally suppressed when focused element is a `button` to prevent double-toggle with click handler
+- `wireKeyboard()` called at init after `wireAudio()`
+
+## Task Commits
+
+1. **Task 1: Add wireKeyboard() function and call it at init** - `3562652` (feat)
+
+## Files Created/Modified
+
+- `lightsync/frontend/app.js` — Added wireKeyboard() function (72 lines) and wireKeyboard() init call
+
+## Decisions Made
+
+- `e.preventDefault()` is called at the start of every key branch to guarantee browser defaults are suppressed before any application logic runs
+- Space on `<button>` elements is explicitly skipped to prevent the double-toggle issue (keyboard Space activates focused buttons naturally; without the guard, Space would trigger both the button click and the wireKeyboard toggle)
+- Ctrl+S uses a GET-then-POST round-trip rather than saving the in-memory timeline state directly — this ensures the server's current show state is preserved (consistent with existing auto-save pattern in commands.js)
+
+## Deviations from Plan
+
+None — plan executed exactly as written. All acceptance criteria met on first implementation pass.
+
+## Known Stubs
+
+None — all keyboard actions wire to real audio element methods, real WebSocket messages, and real undo/redo history calls.
+
+---
+
+*Phase: 05-live-show-execution*
+*Completed: 2026-04-07*