fix: Capture name offset

Author: zharinov

crates/plotnik-lib/src/parser/grammar.rs

@@ -706,6 +706,7 @@ impl Parser<'_> {
     fn try_parse_capture(&mut self, checkpoint: Checkpoint) {
         if self.peek() == SyntaxKind::At {
             self.start_node_at(checkpoint, SyntaxKind::Capture);
+            self.drain_trivia();
             self.parse_capture_suffix();
             self.finish_node();
         }

crates/plotnik-lib/src/parser/tests/grammar/trivia_tests.rs

@@ -17,9 +17,9 @@ fn whitespace_preserved() {
             ParenOpen "("
             Id "identifier"
             ParenClose ")"
+          Whitespace "  "
           At "@"
           Id "name"
-      Whitespace "  "
       Newline "\n"
     "#);
 }