Graph calculator improvmentes

AGENTS.md

@@ -195,7 +195,15 @@ copy + an `APP_LANGUAGES` entry + the code in the backend's `SUPPORTED_LOCALES`.
   address to link to until it is granted), the status pill, the approve/reject buttons,
   and the details diff — the article as sent against the text proposed, both through
   `MarkdownView`, where a creation reads its asked-for address instead of a page that
-  is not there.
+  is not there. The book can hold the wiki's own pages too: `SearchModal` lists
+  `/graph` and `/calculator` among its results (matched by name or by words like
+  *calc*, *plot*, *map*) and opening one lays the live surface on a page of the book
+  beside the articles — `ToolPane.vue` is that page (spine, ×, `inert` when not in
+  view), holding the surface extracted as `GraphStage.vue` / `CalculatorStage.vue`.
+  `useArticleTabs` files such a page under the identity `page:<name>` and finds it
+  at its own address (`tabAt`/`tabHref` know `toolFromPath`); while its page is
+  open, the plain route hosts defer to the book and draw nothing, and asked plain
+  (no open page — a direct link or bookmark) they draw the stage full-page as ever.
 - `app/composables/` — `useRecentlyViewed` (localStorage),
   `useAuth` (the session: token in the `mathew-session` cookie so the server sees it
   too, `signIn`/`signUp`/`signOut`, `authHeaders()` for write calls, `restoreSession()`