helix: use top-level tree-sitter grammars

Apply Helix's locked grammar overlay to pkgs.tree-sitter-grammars so global grammar-scope overrides compose through the public extension point.

pkgs/by-name/he/helix/package.nix

@@ -6,7 +6,7 @@
   helix-unwrapped,
   removeReferencesTo,
   pkgs,
-  tree-sitter,
+  tree-sitter-grammars,
   lockedGrammars ? lib.importJSON ./grammars.json,
   grammarsOverlay ? (
     final: prev: {
@@ -66,13 +66,9 @@ let
         }
     ) prev;
 
-  tree-sitter-grammars =
+  helixTreeSitterGrammars =
     lib.filterAttrs (drvName: _: lib.hasAttr (lib.removePrefix "tree-sitter-" drvName) lockedGrammars)
-      (
-        tree-sitter.grammarsScope.overrideScope (
-          lib.composeExtensions lockedVersionsOverlay grammarsOverlay
-        )
-      );
+      (tree-sitter-grammars.overrideScope (lib.composeExtensions lockedVersionsOverlay grammarsOverlay));
 
   # Dynamic libraries for the grammars always use the `.so` extension, also on Darwin (should use `.dylib`)
   # See here: https://github.com/helix-editor/helix/pull/14982
@@ -82,7 +78,7 @@ let
     lib.concatMapAttrsStringSep "\n" (_: grammar: ''
       install -D ${grammar}/parser $out/${grammar.language}.so
       ${lib.getExe removeReferencesTo} -t ${grammar} $out/${grammar.language}.so
-    '') (lib.filterAttrs (_: lib.isDerivation) tree-sitter-grammars)
+    '') helixTreeSitterGrammars
   );
 
   lockedGrammarsCount = lib.length (lib.attrNames lockedGrammars);
@@ -113,7 +109,7 @@ symlinkJoin {
   passthru = {
     updateScript = ./update.sh;
     runtime = runtimeDir;
-    inherit tree-sitter-grammars;
+    tree-sitter-grammars = helixTreeSitterGrammars;
   };
 
   meta = {