docs(standards): horizontal nav tabs; top-to-bottom component diagram

- mkdocs.wiki.yml: enable navigation.tabs, toc.integrate, header.autohide

- 02_components.md: flowchart TB with increased rank spacing for clarity

standards/src/wiki/02_components.md

@@ -8,7 +8,8 @@ blueprint's component model — `templates/app/` is a runnable instance of it.
 ## 🗂️ Component model
 
 ```mermaid
-flowchart LR
+%%{init: {"flowchart": {"nodeSpacing": 55, "rankSpacing": 120}}}%%
+flowchart TB
     subgraph EDGE["interfaces/ — HTTP edge"]
         OAS["openapi.yaml"]
         RU["resource routes"]