build the inert context once instead of twice

`WorkspaceLayout` and the `createContext` default each spelled out the same eleven fields — every
interaction a panel can start, switched off. Two hand-written copies of one list is a list you fall
behind: adding a field to the context type only errors at the call site if it is required, and both
copies have to be found.

Named it. `inertInteraction` is what "this tree cannot be rearranged" means, and both places spread
it. `cwd` and `root` stay out of it deliberately — they say where the workspace is rather than what
can be done to it, and the inert renderer has no answer for `root`: its consumers only read it when
`cwd` is scoped, which no caller makes it.

src/workspaces/officerdev/src/components/Workspace/WorkspaceContext.ts

@@ -29,10 +29,18 @@ type WorkspaceContextValue = {
 
 const noop = () => {};
 
-const WorkspaceContext = createContext<WorkspaceContextValue>({
-  workspace: null,
-  cwd: '~',
-  panelConfigs: {},
+/**
+ * The interaction half of the context, switched off — every field a panel uses to rearrange the
+ * workspace, plus the state those interactions run on. `WorkspaceLayout` renders a tree nobody can
+ * rearrange (job detail panes, settings, dashboard previews), and it used to say so by repeating
+ * eleven fields at the call site, which is a list you can silently fall behind: add a field to the
+ * context and only one of the two providers gets it.
+ *
+ * `root` and `cwd` are deliberately not in here. They are facts about where the workspace *is*, not
+ * interactions, and the inert renderer has no answer for them — its consumers only read `root` when
+ * `cwd` is scoped, which it never is there.
+ */
+export const inertInteraction = {
   setPanelConfig: noop,
   swapSourceId: null,
   setSwapSourceId: noop,
@@ -44,6 +52,13 @@ const WorkspaceContext = createContext<WorkspaceContextValue>({
   maximizedPanelId: null,
   setMaximizedPanelId: noop,
   transitioningPanelId: null,
+} satisfies Partial<WorkspaceContextValue>;
+
+const WorkspaceContext = createContext<WorkspaceContextValue>({
+  workspace: null,
+  cwd: '~',
+  panelConfigs: {},
+  ...inertInteraction,
   isMobile: false,
   onMobileBack: null,
 });

src/workspaces/officerdev/src/components/Workspace/WorkspaceLayout.tsx

@@ -1,7 +1,7 @@
 import { useCallback } from 'react';
 import type { LayoutNode, AppRegistryMap, PanelComponents } from './types';
 import { updateSizes, collectPanelConfigs } from './layout-utils';
-import { WorkspaceProvider } from './WorkspaceContext';
+import { WorkspaceProvider, inertInteraction } from './WorkspaceContext';
 import { WorkspaceRenderer } from './WorkspaceRenderer';
 import { useAppRegistry } from '../../AppRegistry/useAppRegistry';
 
@@ -36,7 +36,7 @@ export const WorkspaceLayout = ({ layout, onLayoutChange, registry: registryProp
   // dashboard previews. It is not a dashboard and not a screen, and a panel that asks should be told so
   // rather than handed something that parses.
   return (
-    <WorkspaceProvider value={{ workspace: null, cwd: cwd ?? '~', panelConfigs: collectPanelConfigs(layout), setPanelConfig: noop, swapSourceId: null, setSwapSourceId: noop, onSwap: noop, dragSourceId: null, setDragSourceId: noop, onMove: noop, onSetZoom: noop, maximizedPanelId: null, setMaximizedPanelId: noop, transitioningPanelId: null, isMobile: isMobile ?? false, onMobileBack: onMobileBack ?? null }}>
+    <WorkspaceProvider value={{ workspace: null, cwd: cwd ?? '~', panelConfigs: collectPanelConfigs(layout), ...inertInteraction, isMobile: isMobile ?? false, onMobileBack: onMobileBack ?? null }}>
       <WorkspaceRenderer
         layout={layout}
         registry={registry}