Fixes the inline image sizing syntax to make the space before = optional when there's no title, but required when a title is present. This provides better clarity in the syntax.

Problem

The image resize parameter required a whitespace before the = sign to work correctly:

<!-- This didn't work -->
![Manage this data view option](../images/manage-this-data-view.png "=50%")

<!-- This worked -->
![Manage this data view option](../images/manage-this-data-view.png " =50%")

This was unintuitive and caused confusion, as documented in #2014 (comment).

Solution

Updated the regex pattern in LinkRegexExtensions.MatchTitleStylingInstructions() from \s\= to (?:^|\s)\=, implementing nuanced behavior:

• When no title is present: Space before = is optional
• When a title is present: Space before = is required (for clarity)

What Now Works

![alt](img.png "=50%")              <!-- No title, no space needed ✅ -->
![alt](img.png " =50%")             <!-- No title, with space ✅ -->
![alt](img.png "My Title =50%")    <!-- With title, space required ✅ -->
![alt](img.png "=250x330")         <!-- Pixel sizing ✅ -->
![alt](img.png "=250")             <!-- Width only ✅ -->

What Does Not Work

![alt](img.png "My Title=50%")     <!-- With title, no space ❌ -->

When a title is present, the space before = is required to clearly separate the title from the sizing parameters.

Changes

• Code: Updated regex pattern in DiagnosticLinkInlineParser.cs and added .TrimEnd() for proper title extraction
• Tests: Added comprehensive test cases covering the syntax variations (removed test for title without space as it's no longer supported)
• Documentation: Updated docs/syntax/images.md to clarify when space is required vs optional

This change maintains backwards compatibility for all previously working syntax while preventing the ambiguous "My Title=50%" format.

Fixes #2016

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