Add a faint background to freelinks

plugins/tiddlywiki/freelinks/styles.tid

@@ -0,0 +1,8 @@
+title: $:/plugins/tiddlywiki/freelinks/styles
+tags: [[$:/tags/Stylesheet]]
+
+\rules only filteredtranscludeinline transcludeinline macrodef macrocallinline
+
+button.tc-tiddlylink.tc-freelink, a.tc-tiddlylink.tc-freelink {
+	background-color: #5777d91c;
+}

plugins/tiddlywiki/freelinks/text.js

@@ -98,7 +98,8 @@ TextNodeWidget.prototype.execute = function() {
 					childParseTree[index] = {
 						type: "link",
 						attributes: {
-							to: {type: "string", value: match[0]}
+							to: {type: "string", value: match[0]},
+							"class": {type: "string", value: "tc-freelink"}
 						},
 						children: [{
 							type: "plain-text", text: match[0]