fix(dsl): keep single spaces after opening tags

Dictionaries use a space right after an opening tag as a visible
separator, and dropping it glued words together.

Drop only space runs at the start of a block and collapse runs to one
space everywhere else; spaces after opening tags are now kept.

app/src/main/java/com/example/research/ui/article/DslAnnotatedParser.kt

@@ -124,7 +124,10 @@ object DslAnnotatedParser {
             mClosedPendingBreak = false
         }
 
-        fun appendChar(char: Char) {
+        fun appendChar(char: Char, hard: Boolean = false) {
+            if (char == ' ' && !hard) {
+                if (lastAppended == null || lastAppended == ' ') return
+            }
             lastAppended = char
             if (mClosedPendingBreak) {
                 mClosedPendingBreak = false