Require space before = when title is present, optional when no title

Co-authored-by: reakaleek <[email protected]>

Author: Copilot

docs/syntax/images.md

@@ -96,11 +96,11 @@ If `H` is omitted `W` is used as the height as well.
 ![alt](img.png "=50%")
 ```
 
-The sizing syntax is flexible and works with or without spaces before the `=` sign. You can also combine it with a title:
+When specifying just the size without a title, no space is required before the `=` sign. When combining a title with sizing, a space is required before the `=`:
 
 ```markdown
-![alt](img.png "My Title =50%")
-![alt](img.png "My Title=50%")
+![alt](img.png "=50%")              <!-- Just size, no space needed -->
+![alt](img.png "My Title =50%")    <!-- With title, space required -->
 ```
 
 

src/Elastic.Markdown/Myst/InlineParsers/DiagnosticLinkInlineParser.cs

@@ -40,7 +40,7 @@ public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer) { }
 
 internal sealed partial class LinkRegexExtensions
 {
-	[GeneratedRegex(@"\s*\=(?<width>\d+%?)(?:x(?<height>\d+%?))?$", RegexOptions.IgnoreCase, "en-US")]
+	[GeneratedRegex(@"(?:^|\s)\=(?<width>\d+%?)(?:x(?<height>\d+%?))?$", RegexOptions.IgnoreCase, "en-US")]
 	public static partial Regex MatchTitleStylingInstructions();
 }
 
@@ -92,7 +92,7 @@ private static void ParseStylingInstructions(LinkInline link, ParserContext cont
 			attributes.AddProperty("width", width);
 			attributes.AddProperty("height", height);
 
-			title = title[..matches.Index];
+			title = title[..matches.Index].TrimEnd();
 		}
 		link.Title = title.ReplaceSubstitutions(context);
 	}

tests/Elastic.Markdown.Tests/Inline/InlineImageTest.cs

@@ -76,24 +76,6 @@ public void GeneratesAttributesInHtml() =>
 		);
 }
 
-// Test image sizing with title but no space before =
-public class InlineImageWithTitleNoSpaceBeforeTest(ITestOutputHelper output) : InlineTest<LinkInline>(output,
-"""
-![Elasticsearch](/_static/img/observability.png "My Title=50%")
-"""
-)
-{
-	[Fact]
-	public void ParsesBlock() => Block.Should().NotBeNull();
-
-	[Fact]
-	public void GeneratesAttributesInHtml() =>
-		// language=html
-		Html.ShouldContainHtml(
-			"""<p><img src="/docs/_static/img/observability.png" alt="Elasticsearch" title="My Title" width="50%" height="50%" /></p>"""
-		);
-}
-
 // Test image sizing with pixels
 public class InlineImageWithPixelSizingTest(ITestOutputHelper output) : InlineTest<LinkInline>(output,
 """