Add support for untracked local snippets

lua/plugins/treesitter.lua

@@ -1,3 +1,25 @@
+-- Fold markdown sections through the blank lines that trail them. The upstream
+-- query applies (#trim! @fold) to (section), which leaves the blank lines before
+-- the next heading outside the fold and pads every collapsed section with an
+-- empty line. Set explicitly rather than dropped in after/queries/, since only
+-- the first folds.scm found on the runtimepath is used as the base query and the
+-- one shipped with the parser wins that race.
+vim.treesitter.query.set('markdown', 'folds', [[
+([
+  (fenced_code_block)
+  (indented_code_block)
+  (list_item
+    (list))
+] @fold
+  (#trim! @fold))
+
+(section) @fold
+
+(section
+  (list) @fold
+  (#trim! @fold))
+]])
+
 local has_tree_sitter_cli = vim.fn.executable('tree-sitter') == 1
 
 if not has_tree_sitter_cli then