perf(explorer): early exit for tree calculation

lua/snacks/picker/source/explorer.lua

@@ -295,7 +295,7 @@ function M.search(opts, ctx)
         item.hidden = true
       end
       item.text = item.text:sub(1, #opts.cwd) == opts.cwd and item.text:sub(#opts.cwd + 2) or item.text
-      local node = Tree:find(item.file)
+      local node = Tree:node(item.file)
       if node then
         item.status = (not node.dir or opts.git_status_open) and node.status or nil
       end
@@ -334,7 +334,9 @@ function M.search(opts, ctx)
 
       -- Add parents when needed
       for dir in Snacks.picker.util.parents(item.file, opts.cwd) do
-        if not dirs[dir] then
+        if dirs[dir] then
+          break
+        else
           dirs[dir] = {
             text = dir,
             file = dir,