fix(grammar): make brace and keyword separately queryable

queries/tumblr/highlights.scm

@@ -1,16 +1,15 @@
 ; Punctuation
 "{" @punctuation.bracket
 "}" @punctuation.bracket
-
-; Keywords that introduce a tag form. The grammar exposes the opening
-; sequence as a hidden node, so capture the parent and let the editor
-; colour the leading {block:, {/block:, {lang: literally via the
-; tokenizer. The colon delimiter inside a variable_prefix tag is captured
-; below.
 ":" @punctuation.delimiter
 "-" @punctuation.delimiter
+"/" @punctuation.delimiter
 "=" @operator
 
+; Block and lang keywords inside their tags: the literal "block" / "lang".
+(block_keyword) @keyword.directive
+(lang_keyword) @keyword.directive
+
 ; Block names. Known data-block names get @function.builtin; If/IfNot
 ; toggles get @keyword.conditional (theme authors may define arbitrary
 ; If* / IfNot* names via <meta name="if:..."> so we match by prefix).