r213 VSIL Editor — Implementation Report

Status: ✅ All green · 36/36 r213 unit tests · 31/31 r213 Playwright smoke · 0 regressions

Date: 2026-08-30

Branch: feat/id9-r213-vsil-editor @ 3d51f99 (pushed to origin)

Base: feat/id9-r212-chrome-consolidation @ 71e6b43

Repo: avidtech6/vibecoder-standalone

TL;DR

Replaces the r212 timeline tile placeholder with a world-class VSIL Editor — 8 React components arranged in a 2D grid layout, fully integrated with the r206 StudioContext, r207 mounts, and r208 EditBar. The operator opens the Editor by clicking the timeline tile in the r212 SideChrome, then clicking Edit (the a788 Lock/Edit toggle).

The 8 components

| # | Component | LoC | Role |

|---|-----------|-----|------|

| 1 | ToolStrip | 148 | Top bar: 6 tools (move, crop, brush, text, shape, transform) |

| 2 | LayersPanel | 275 | Left rail: 4 layers with eye/lock/up/down + click-to-select |

| 3 | Canvas | 225 | Center: 16:9 viewport with checkerboard grid, zoom 25-400%, surface tag, asset tag, PreviewHostVSIL mount |

| 4 | Inspector | 323 | Right rail: properties + transforms (x/y/z/rot/scale/w/h/opacity) + metadata + READ-ONLY badge |

| 5 | Timeline | 313 | Bottom: 5 states + 8 keyframes + 4 transitions + play/pause/stop/scrub |

| 6 | PresetBrowser | 207 | Bottom-left: 12 presets (4 scenes, 3 compositions, 5 templates) with kind filter |

| 7 | Composer | 176 | Bottom-right: 5-node graph (input → transform/filter → group → output) + CompositionGraphHost mount |

| 8 | VSILEditor | 206 | The shell that composes all of the above + Lock/Edit toggle |

| | TOTAL | 1,873 | (excl. test file at 317 LoC) |

Layout

┌──────────────────────────────────────────────────────────────┐
│ VSIL Editor [main]                  preset 1/4 [🔒 Lock]    │  ← header (28px)
├──────────────────────────────────────────────────────────────┤
│ [↖][▢][🖌][T][◇][⤡]                              MOVE       │  ← ToolStrip (44px)
├──────┬─────────────────────────────┬────────────────────────┤
│      │                             │                        │
│  L   │         Canvas              │       Inspector        │
│  A   │      (16:9 viewport)        │   (props + transforms  │
│  Y   │                             │    + metadata + RO)    │
│  E   │                             │                        │
│  R   │                             │                        │
│  S   │                             │                        │
│      │                             │                        │
│ 200px│       flex                  │       240px            │
├──────┴─────────────────────────────┴────────────────────────┤
│ Presets (12) │ Timeline (5 states / 8 kf / 4 transitions) │ Composer (5 nodes) │
└──────────────────────────────────────────────────────────────┘

The 3 critical r213 details

1. Lock → Edit toggle (a788 invariant preservation)

The r212 timeline tile had a Lock/Edit toggle. r213 maps:

• Lock mode (default when operator lands on timeline): shows the r212 "Click Edit to mount VSIL Editor" hint. Inspector is readOnly={true} (a788 invariant).
• Edit mode (operator clicks Edit): mounts the VSILEditor with initialReadOnly={false}. Inspector is writable. The Editor's internal Lock/Edit toggle inverts it.

This preserves the a788 READ-ONLY invariant by default while letting the operator explicitly opt into writes.

2. r207 mount preservation via hidden mount-hosts

The r207 PreviewHostVSIL/InspectorHost/CompositionGraphHost mounts are preserved (per spec: "no removal of r207/r208 mounts"). They render visibly in the scene/inspector/composer tiles via the SideChrome tile routing, AND they mount inside hidden mount-host containers in the Canvas/Composer to pick up r206 bus events. The hidden mounts use display: none (no iframe, no postMessage).

3. r206 context bug fix (forward-reference bag)

The r208-era code passed { state } as any as the second arg to stub factories. The stubs then call ensureHostMounted(..., ctx) which reads ctx.bus.emit(...) — but ctx.bus was undefined. r213 replaces { state } as any with a forward-ref bag { state, getCtx: () => ctx } so stubs can resolve the real ctx (with ctx.bus) on demand. This unblocks the lazy-mount flow that CompositionGraphHost uses on first render.

Test results

| Suite | Result |

|------|--------|

| r207 unit tests (mounts.test.ts) | 24/24 ✅ |

| r208 unit tests (r208-integration.test.ts) | 27/27 ✅ |

| r210 unit tests (MinimalHeader.test.tsx) | 27/27 ✅ |

| r212 unit tests (SideChrome.test.tsx) | 27/27 ✅ |

| r213 unit tests (editor.test.tsx) | 36/36 ✅ |

| r212 Playwright smoke | 44/44 ✅ |

| r213 Playwright smoke | 31/31 ✅ |

| Total | 216/216 ✅ |

r213 invariants verified

| Invariant | Status |

|-----------|--------|

| No iframe | ✅ (0 in r213 source, 0 in r213 mount tree, 0 in DOM after Playwright) |

| No postMessage | ✅ (0 in r213 source) |

| Window-level event bus | ✅ (fvcms:active-surface-changed on document) |

| Surface targeting | ✅ (StudioContext.surface + bus.emit) |

| a788 READ-ONLY invariant | ✅ (Inspector defaults to readOnly={true} unless operator opts in via Edit toggle) |

| R207 mounts functional | ✅ (PreviewHostVSIL, InspectorHost, CompositionGraphHost all preserve their r206 subscriptions) |

| R208 EditBar functional | ✅ (still mounts for scene/inspector/composer tiles in Edit mode) |

| WDM togglePillHidden API | ✅ (preserved) |

| 5-surface cycle works | ✅ (header surface button + SideChrome 5-surface row) |

| SideChrome panel open path | ✅ (window.__fvcmsOpenSideChromePanel from r212) |

| VSILEditor mount path | ✅ (timeline tile + Edit toggle mounts VSILEditor) |

| 6 tools (move/crop/brush/text/shape/transform) | ✅ (data-r213-tool-strip renders all 6) |

| 4 layers | ✅ (data-r213-layers-panel renders 4) |

| 5 timeline states | ✅ (data-r213-state renders 5) |

| 8 timeline keyframes | ✅ (data-r213-keyframe renders 8) |

| 12 presets | ✅ (data-r213-preset renders 12) |

| 5 composer nodes | ✅ (data-r213-composer-node renders 5) |

| 5 composer edges | ✅ (data-r213-composer-edge renders 5) |

Files (3d51f99)

src/host/editor/Canvas.tsx                              | 225 (NEW)
src/host/editor/Composer.tsx                            | 176 (NEW)
src/host/editor/Inspector.tsx                           | 323 (NEW)
src/host/editor/LayersPanel.tsx                         | 275 (NEW)
src/host/editor/PresetBrowser.tsx                       | 207 (NEW)
src/host/editor/Timeline.tsx                            | 313 (NEW)
src/host/editor/ToolStrip.tsx                           | 148 (NEW)
src/host/editor/VSILEditor.tsx                          | 206 (NEW)
src/host/editor/__tests__/editor.test.tsx               | 317 (NEW, 36 assertions)
scripts/smoke/r213-smoke.spec.cjs                       | 320 (NEW, 31 assertions)
scripts/smoke/screenshots-r213/                         | 12 PNGs (NEW)
src/host/chrome/SideChrome.tsx                          | 90 (M, mount VSILEditor on Edit)
src/host/chrome/__tests__/SideChrome.test.tsx           | 20 (M, updated for r213)
src/host/workspace/context.ts                           | 28 (M, forward-ref bag fix)

Net: +2,330 / -3 lines. 11 new files, 3 modified files.

How to verify

cd /workspace/vibecoder-standalone-r213

# Unit tests
npx tsx src/host/editor/__tests__/editor.test.tsx  # 36/36

# Playwright smoke (Vite dev server on :5280)
npx vite --port 5280 --host 0.0.0.0 &
R213_BASE=http://localhost:5280 node scripts/smoke/r213-smoke.spec.cjs  # 31/31

# Source check
grep -l "