feat: minimap toggle

frontend/src/app/canvas/CanvasMenubar.tsx

@@ -35,6 +35,8 @@ export type CanvasMenubarProps = {
   canDuplicate?: boolean
   canCopy?: boolean
   onFitView?: () => void
+  showMinimap?: boolean
+  onToggleMinimap?: (visible: boolean) => void
 }
 
 const UNDO_KEYS = { key: 'z', shiftKey: false }
@@ -58,6 +60,8 @@ export function CanvasMenubar({
   canDuplicate = false,
   canCopy = false,
   onFitView,
+  showMinimap = true,
+  onToggleMinimap,
 }: CanvasMenubarProps) {
   const { theme, setTheme } = useTheme()
   const { projectId } = useParams<{ projectId: string }>()
@@ -253,6 +257,18 @@ export function CanvasMenubar({
                 </MenubarCheckboxItem>
               </MenubarSubContent>
             </MenubarSub>
+            {onToggleMinimap != null && (
+              <>
+                <MenubarSeparator />
+                <MenubarCheckboxItem
+                  checked={showMinimap}
+                  onCheckedChange={(checked) => onToggleMinimap(checked)}
+                  className="gap-2"
+                >
+                  Minimap
+                </MenubarCheckboxItem>
+              </>
+            )}
           </MenubarContent>
         </MenubarMenu>
       </Menubar>

frontend/src/app/canvas/CanvasPage.tsx

@@ -190,6 +190,7 @@ export function CanvasPage({ projectId }: CanvasPageProps) {
   const [lastCreatedNodeId, setLastCreatedNodeId] = React.useState<string | null>(null)
   const [isPanning, setIsPanning] = React.useState(false)
   const [isSelecting, setIsSelecting] = React.useState(false)
+  const [showMinimap, setShowMinimap] = React.useState(true)
   const [ariaAnnouncement, setAriaAnnouncement] = React.useState<string | null>(null)
   const nodesRef = useRef(nodes)
   nodesRef.current = nodes
@@ -569,6 +570,8 @@ export function CanvasPage({ projectId }: CanvasPageProps) {
         canDuplicate={selectedNodes.length > 0}
         canCopy={selectedNodes.length === 1}
         onFitView={() => flowActionsRef.current?.fitView?.()}
+        showMinimap={showMinimap}
+        onToggleMinimap={setShowMinimap}
       />
       {apiTodosCount !== null && (
         <div className="shrink-0 px-3 py-1 text-xs text-muted-foreground border-b border-border/50">
@@ -662,9 +665,11 @@ export function CanvasPage({ projectId }: CanvasPageProps) {
                       <div role="group" aria-label="Canvas controls: zoom and fit view">
                         <Controls />
                       </div>
+                      {showMinimap && (
                         <div role="region" aria-label="Minimap: overview of the graph">
                           <MiniMap />
                         </div>
+                      )}
                     </ReactFlow>
                   </ReactFlowProvider>
                 </div>

frontend/src/app/platform/PlatformPage.tsx

@@ -13,11 +13,6 @@ function PlatformLayoutInner() {
   const { recordProjectAccess } = usePlatform()
   const [sidebarOpen, setSidebarOpen] = useState(true)
 
-  useEffect(() => {
-    if (projectId) setSidebarOpen(false)
-    else setSidebarOpen(true)
-  }, [projectId])
-
   useEffect(() => {
     if (projectId) recordProjectAccess(projectId)
   }, [projectId, recordProjectAccess])