feat: display app version in Settings dialog (#337)

* feat(mcp): add XML validation and auto-fix to MCP server

- Add xml-validation.ts with validateAndFixXml function
- Integrate validation into display_diagram tool (fails if unfixable)
- Integrate validation into edit_diagram tool (auto-fix each operation)
- Fix bug: typo fixes now run before foreign tag removal
- Fix bug: use before/after comparison instead of regex .test()

* style: auto-format with Biome

* chore(mcp): bump version to 0.1.3

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

components/settings-dialog.tsx

@@ -452,6 +452,11 @@ export function SettingsDialog({
                         />
                     </div>
                 </div>
+                <div className="pt-4 border-t border-border/50">
+                    <p className="text-[0.75rem] text-muted-foreground text-center">
+                        Version {process.env.APP_VERSION}
+                    </p>
+                </div>
             </DialogContent>
         </Dialog>
     )

next.config.ts

@@ -1,8 +1,12 @@
 import type { NextConfig } from "next"
+import packageJson from "./package.json"
 
 const nextConfig: NextConfig = {
     /* config options here */
     output: "standalone",
+    env: {
+        APP_VERSION: packageJson.version,
+    },
 }
 
 export default nextConfig