docs(editor-shell): fix the stale ChatStripPanel mount line reference

The table pointed at NewEditorShell.tsx :1133-1151; the conditional mount
is at :1191-1195. Caught in review on #479.

Author: EtienneLescot

technical-documentation/architecture/editor-shell.md

@@ -58,7 +58,7 @@ of those are local React state, with the document itself read through
 | **Stage — Rec mode** | `src/components/ai-edition/v4/RecStage.tsx` | Pre-flight config for a new recording — mic / camera / system audio / cursor capture mode — then hands off to the standalone recorder HUD window when the user hits record. |
 | **Bottom timeline** | `src/components/ai-edition/v4/V4Timeline.tsx` | Renders the clips, the ruler, and the five lanes (`annPills`, `speedPills`, `trimPills`, `zoomPills`, `cameraFullscreenPills`, computed at `:321-363`). Owns transport (play / prev / next / loop), zoom/pan, scrub, drag-and-drop of asset cards, the "smart zooms + cuts" AI prompt, and resize/move/delete of every pill. Pills render through `coalesceRegionsForRuler` and `coalescedTrimGroups` so what the user sees is exactly what the rules in [timeline-model.md](timeline-model.md) describe. |
 | **Floating inspector** | `src/components/ai-edition/v4/FloatingInspector.tsx` | Floating facet rail over the stage; the open panel either shows the `FacetBody` for the current facet (`effects` / `layout` / `audio` / `cursor` / `captions` / `transcript`) or, when a region is selected, a `SelectionPane` (`:434`) that edits the selected pill by id. The "pencil" rail button opens `EditClipModal` for crop + trim. |
-| **Left chat column** (`ChatStripPanel`) | `src/components/ai-edition/LeftPanel.tsx` | Only mounted when `mode === "edit"` and `chatOpen` is true (`NewEditorShell.tsx` `:1133-1151`). Sends user messages to the LLM via IPC. Resize handle is `v4.chatResizeHandle`; width persists in `localStorage` as `os-editor-chat-width`. |
+| **Left chat column** (`ChatStripPanel`) | `src/components/ai-edition/LeftPanel.tsx` | Only mounted when `mode === "edit"` and `chatOpen` is true (`NewEditorShell.tsx` `:1191-1195`). Sends user messages to the LLM via IPC. Resize handle is `v4.chatResizeHandle`; width persists in `localStorage` as `os-editor-chat-width`. |
 | **Modals** | `src/components/ai-edition/Modals.tsx` | `OpenProjectModal`, `NewProjectModal`, `EditClipModal` (per-clip crop + in/out), `UnsavedChangesModal`. Mounted at the shell level (`:1286-1332`) so every trigger site reuses the same instance. |
 | **Export dialog** | `src/components/ai-edition/ExportDialog.tsx` | Format / quality / frame-rate / codec / size; calls `exportAxcutDocument` (GIF path, WebCodecs) or `exportMultiNative` (MP4 path, native D3D compositor). The MP4 path is the one that goes through `src/lib/ai-edition/exporter/documentExporter.ts`'s `projectRegionsToSourceTime` and the multi-clip native bridge. |
 | **Captions pane** | `src/components/ai-edition/CaptionsPane.tsx` | Mounted as a facet body from `FloatingInspector.tsx` (`:1062`). Controls caption appearance + translations; the cues themselves are a derived view over `document.transcripts` (see [`src/lib/ai-edition/captions/`](../../src/lib/ai-edition/captions/)). |