chore: bump mermaid and related packages to latest

Upgrade mermaid 11.15.0, layout-elk 0.2.1, and layout-tidy-tree 0.2.2.

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -97,15 +97,15 @@
     "@fsegurai/codemirror-theme-vscode-dark": "^6.1.4",
     "@fsegurai/codemirror-theme-vscode-light": "^6.1.4",
     "@mermaid-js/examples": "^1.2.0",
-    "@mermaid-js/layout-elk": "^0.1.9",
-    "@mermaid-js/layout-tidy-tree": "^0.2.1",
+    "@mermaid-js/layout-elk": "^0.2.1",
+    "@mermaid-js/layout-tidy-tree": "^0.2.2",
     "@mermaid-js/mermaid-zenuml": "^0.2.3",
     "codemirror": "^6.0.1",
     "dayjs": "^1.11.13",
     "hammerjs": "^2.0.8",
     "js-base64": "3.7.7",
     "lodash-es": "^4.17.21",
-    "mermaid": "^11.14.0",
+    "mermaid": "^11.15.0",
     "mode-watcher": "^0.5.1",
     "monaco-editor": "0.52.2",
     "pako": "2.1.0",