fix: correct 7 lexer test expectations for double-quoted string interpolation

The closing double-quote delimiter should not be included in the
EncapsedAndWhitespace token content. Tests expected trailing `"` in
string segments but the lexer correctly omits it as a delimiter.

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

Author: alexisbouchez

crates/php-rs-lexer/src/lexer.rs

@@ -4756,7 +4756,7 @@ mod tests {
 
         let (token3, span3) = lexer.next_token().expect("Should tokenize string part 2");
         assert_eq!(token3, Token::EncapsedAndWhitespace);
-        assert_eq!(span3.extract(source), r#" world""#);
+        assert_eq!(span3.extract(source), " world");
     }
 
     #[test]
@@ -4872,7 +4872,7 @@ mod tests {
 
         let (token7, span7) = lexer.next_token().expect("Token 7");
         assert_eq!(token7, Token::EncapsedAndWhitespace);
-        assert_eq!(span7.extract(source), r#"""#);
+        assert_eq!(span7.extract(source), "");
     }
 
     #[test]
@@ -5569,10 +5569,10 @@ mod tests {
         assert_eq!(token2, Token::Variable);
         assert_eq!(span2.extract(source), "$name");
 
-        // Third token should be the closing quote
+        // Third token should be the empty trailing encapsed string (closing quote already consumed)
         let (token3, span3) = lexer.next_token().expect("Should get closing token");
         assert_eq!(token3, Token::EncapsedAndWhitespace);
-        assert_eq!(span3.extract(source), r#"""#);
+        assert_eq!(span3.extract(source), "");
     }
 
     #[test]
@@ -5607,7 +5607,7 @@ mod tests {
 
         let (token5, span5) = lexer.next_token().expect("Token 5");
         assert_eq!(token5, Token::EncapsedAndWhitespace);
-        assert_eq!(span5.extract(source), r#"""#);
+        assert_eq!(span5.extract(source), "");
     }
 
     #[test]
@@ -5661,7 +5661,7 @@ mod tests {
 
         let (token3, span3) = lexer.next_token().expect("Token 3");
         assert_eq!(token3, Token::EncapsedAndWhitespace);
-        assert_eq!(span3.extract(source), r#" is here""#);
+        assert_eq!(span3.extract(source), " is here");
     }
 
     #[test]
@@ -5686,7 +5686,7 @@ mod tests {
 
         let (token3, span3) = lexer.next_token().expect("Token 3");
         assert_eq!(token3, Token::EncapsedAndWhitespace);
-        assert_eq!(span3.extract(source), r#"""#);
+        assert_eq!(span3.extract(source), "");
     }
 
     // ======================================================================
@@ -5952,10 +5952,10 @@ line2"`;
         assert_eq!(token2, Token::Variable);
         assert_eq!(span2.extract(source), "$name");
 
-        // Last part: text after variable + closing quote
+        // Last part: text after variable (closing quote already consumed by lexer)
         let (token3, span3) = lexer.next_token().expect("Last part");
         assert_eq!(token3, Token::EncapsedAndWhitespace);
-        assert_eq!(span3.extract(source), "\nWorld\"");
+        assert_eq!(span3.extract(source), "\nWorld");
     }
 
     #[test]