feat: expose Preview Auto-fix Diff command in contributes + docs

Author: soderlind

README.md

@@ -152,6 +152,7 @@ Tags are rendered as simple uppercase bracketed items (e.g. `[SEO] [CACHE]`) for
 | `WordPress Readme: Open Preview` | Command Palette, Context Menu | Open preview in current editor group |
 | `WordPress Readme: Open Preview to the Side` | Toolbar, Context Menu | Open side-by-side preview |
 | `WordPress Readme: Validate Readme` | Context Menu, Command Palette | Run validation and show detailed results |
+| `WordPress Readme: Preview Auto-fix Diff` | Command Palette | Open a diff view comparing current document vs proposed auto-fix changes (no edits applied) |
 | `WordPress Readme: Auto-fix Markdown to WordPress style` | Command Palette | Apply safe formatting fixes (normalize headings, code blocks, spacing) |
 
 ## Context Menu Integration

package.json

@@ -44,6 +44,7 @@
 		"onLanguage:readme-txt",
 		"onCommand:wordpress-readme.showPreview",
 		"onCommand:wordpress-readme.showPreviewToSide",
+		"onCommand:wordpress-readme.previewAutoFixDiff",
 		"onWebviewPanel:wordpress-readme-preview"
 	],
 	"main": "./out/extension.js",
@@ -95,6 +96,12 @@
 				"title": "Auto-fix Markdown to WordPress style",
 				"category": "WordPress Readme",
 				"icon": "$(wand)"
+			},
+			{
+				"command": "wordpress-readme.previewAutoFixDiff",
+				"title": "Preview Auto-fix Diff",
+				"category": "WordPress Readme",
+				"icon": "$(diff)"
 			}
 		],
 		"menus": {