Render abbreviated commit hash URLs as code links in markup

Previously only full 40-64 character hash URLs were rendered as
`<a><code>hash</code></a>`. Now URLs with abbreviated hashes (7+
characters) get the same treatment, consistent with how other hash
patterns in the codebase already work.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

modules/markup/html.go

@@ -62,7 +62,7 @@ var globalVars = sync.OnceValue(func() *globalVarsType {
 	v.shortLinkPattern = regexp.MustCompile(`\[\[(.*?)\]\](\w*)`)
 
 	// anyHashPattern splits url containing SHA into parts
-	v.anyHashPattern = regexp.MustCompile(`https?://(?:\S+/){4,5}([0-9a-f]{40,64})((\.\w+)*)(/[-+~%./\w]+)?(\?[-+~%.\w&=]+)?(#[-+~%.\w]+)?`)
+	v.anyHashPattern = regexp.MustCompile(`https?://(?:\S+/){4,5}([0-9a-f]{7,64})((\.\w+)*)(/[-+~%./\w]+)?(\?[-+~%.\w&=]+)?(#[-+~%.\w]+)?`)
 
 	// comparePattern matches "http://domain/org/repo/compare/COMMIT1...COMMIT2#hash"
 	v.comparePattern = regexp.MustCompile(`https?://(?:\S+/){4,5}([0-9a-f]{7,64})(\.\.\.?)([0-9a-f]{7,64})?(#[-+~_%.a-zA-Z0-9]+)?`)