fix: revert to Material built-in mermaid rendering

mermaid2 plugin hooks are not invoked by zensical (Rust-based SSG that
bypasses MkDocs plugin architecture). Revert to the original
pymdownx.superfences fence_code_format which Material's bundled JS
handles natively.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Eoic

mkdocs.yml

@@ -49,12 +49,6 @@ theme:
 plugins:
   - search:
       separator: '[\s\-\.]+'
-  - mermaid2:
-      version: '10.4.0'
-      arguments:
-        theme: |
-          ^(window.matchMedia('(prefers-color-scheme: dark)').matches ||
-            document.body.getAttribute('data-md-color-scheme') === 'slate' ? 'dark' : 'default')
 
 exclude_docs: |
   SUMMARY.md
@@ -90,7 +84,11 @@ markdown_extensions:
   - pymdownx.mark
   - pymdownx.smartsymbols
   - pymdownx.snippets
-  - pymdownx.superfences
+  - pymdownx.superfences:
+      custom_fences:
+        - name: mermaid
+          class: mermaid
+          format: !!python/name:pymdownx.superfences.fence_code_format
   - pymdownx.tabbed:
       alternate_style: true
   - pymdownx.tasklist:

pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 license = { text = "MIT" }
 requires-python = ">=3.10"
 
-dependencies = ["zensical>=0.0.24", "mkdocs-swagger-ui-tag>=0.6", "mkdocs-mermaid2-plugin>=1.2"]
+dependencies = ["zensical>=0.0.24", "mkdocs-swagger-ui-tag>=0.6"]
 
 [project.optional-dependencies]
 dev = ["linkchecker>=10.0"]