feat(core): Persist current view across app refreshes

Added currentView to zustand persist partialize, ensuring that the
last viewed route is saved to localStorage and restored on app load.
This prevents the app from redirecting to overview on every refresh.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/src/components/views/kanban-card.tsx

@@ -76,16 +76,15 @@ export function KanbanCard({ feature, onEdit, onDelete, onViewOutput, onVerify,
           </div>
         )}
         <div className="flex items-start gap-2">
-          <div
-            {...listeners}
-            className={cn(
-              "mt-0.5 touch-none",
-              isDraggable ? "cursor-grab" : "cursor-not-allowed opacity-50"
-            )}
-            data-testid={`drag-handle-${feature.id}`}
-          >
-            <GripVertical className="w-4 h-4 text-muted-foreground" />
-          </div>
+          {isDraggable && (
+            <div
+              {...listeners}
+              className="mt-0.5 touch-none cursor-grab"
+              data-testid={`drag-handle-${feature.id}`}
+            >
+              <GripVertical className="w-4 h-4 text-muted-foreground" />
+            </div>
+          )}
           <div className="flex-1 min-w-0">
             <CardTitle className="text-sm leading-tight">
               {feature.description}