feat(core): incrementally load items

src/core/provider/local.zig

@@ -18,7 +18,9 @@ fn loadChildren(container: *Container) void {
     while (it.next() catch return) |entry| {
         const child = container.item.fullName.getChild(entry.name, container.item.allocator) catch return;
 
-        container.children.append(child) catch return;
+        container.children.mutex.lock();
+        defer container.children.mutex.unlock();
+        container.children.data.append(child) catch return;
     }
 }
 
@@ -108,7 +110,9 @@ pub const LocalContentProvider = struct {
             .directory => blk: {
                 const container = try allocator.create(Container);
                 container.* = Container{
-                    .children = std.ArrayList(FullName).init(allocator),
+                    .children = locked(std.ArrayList(FullName)){
+                        .data = std.ArrayList(FullName).init(allocator),
+                    },
                     .childrenLoading = true,
                     .item = undefined,
                 };
@@ -214,3 +218,4 @@ const ItemEnum = models.ItemEnum;
 const Element = models.Element;
 const Container = models.Container;
 const native_os = @import("builtin").os.tag;
+const locked = @import("../sync.zig").locked;