Fix CRLF handling in external scanner

- Consume \r as part of token instead of skipping it
- Break after consuming \n to avoid processing multiple lines
- Consume leading whitespace separately for indent calculation
- Fix ASCII_CONTENT to return false at EOF without asciiend

This fixes ERROR tokens with CRLF line endings, especially
with trailing blank lines.

src/scanner.c

@@ -110,11 +110,8 @@ bool tree_sitter_stonescript_external_scanner_scan(void *payload, TSLexer *lexer
       }
       
       // Check if we're at the start of a line with 'asciiend'
-      if (lexer->lookahead == '\n' || lexer->lookahead == '\r') {
+      if (lexer->lookahead == '\n') {
         lexer->advance(lexer, false);
-        if (lexer->lookahead == '\r' || lexer->lookahead == '\n') {
-          lexer->advance(lexer, false);
-        }
         lexer->mark_end(lexer);
         has_content = true;
         
@@ -156,8 +153,8 @@ bool tree_sitter_stonescript_external_scanner_scan(void *payload, TSLexer *lexer
       }
     }
     
-    lexer->result_symbol = ASCII_CONTENT;
-    return has_content;
+    // If we reached EOF without finding asciiend, this is not valid ASCII content
+    return false;
   }
 
   if (scanner->queued_tokens_size > 0) {
@@ -180,10 +177,17 @@ bool tree_sitter_stonescript_external_scanner_scan(void *payload, TSLexer *lexer
       found_end_of_line = true;
       indent_length = 0;
       lexer->advance(lexer, false);
+      // After consuming \n, only consume whitespace on the SAME logical line
+      // Don't continue to next line
+      break;
+    } else if (lexer->lookahead == '\r') {
+      // Consume \r as part of line ending (for CRLF), don't skip it
+      lexer->advance(lexer, false);
+      // Continue to potentially consume \n that follows \r
     } else if (lexer->lookahead == ' ') {
       indent_length++;
       lexer->advance(lexer, false);
-    } else if (lexer->lookahead == '\r' || lexer->lookahead == '\f') {
+    } else if (lexer->lookahead == '\f') {
       indent_length = 0;
       lexer->advance(lexer, false);
     } else if (lexer->lookahead == '\t') {
@@ -196,6 +200,18 @@ bool tree_sitter_stonescript_external_scanner_scan(void *payload, TSLexer *lexer
       break;
     }
   }
+  
+  // After breaking from newline, consume leading whitespace/indentation
+  if (found_end_of_line && !lexer->eof(lexer)) {
+    while (lexer->lookahead == ' ' || lexer->lookahead == '\t') {
+      if (lexer->lookahead == ' ') {
+        indent_length++;
+      } else {
+        indent_length += 8;
+      }
+      lexer->advance(lexer, false);
+    }
+  }