Fix documentation drift surfaced by the full-docs consistency review

docs/architecture/01-state-and-stores.md

@@ -34,7 +34,7 @@ hook. The state object holds both **data fields** and **action functions**.
 import { create } from 'zustand';
 import type { UiTheme } from '@core/theme'; // defined in core; charts key off it too
 
-export type ModalName = 'datasets' | 'settings' | 'about' | 'donate' | 'chartBuilder' | 'extract';
+export type ModalName = 'datasets' | 'about' | 'donate' | 'chartBuilder' | 'extract';
 
 export interface AppState {
   uiTheme: UiTheme;
@@ -113,7 +113,7 @@ Services, orchestration, infrastructure, and tests use the store object directly
 no React involved. This is the property that lets our logic live outside components:
 
 ```ts
-openModal('settings'); // via the modal coordinator (doc 03)
+openModal('datasets'); // via the modal coordinator (doc 03)
 const theme = useAppStore.getState().uiTheme; // snapshot read
 const unsub = useAppStore.subscribe((s, prev) => {
   /* react to changes */
@@ -361,7 +361,7 @@ Subscribers read state and write to `src/app/infrastructure/` adapters (IndexedD
 ### Theme → document (the minimal example, already wired)
 
 ```ts
-// src/main.tsx
+// src/app/orchestration/theme.ts (wired from main.tsx at startup)
 const applyTheme = (t: string) => {
   document.documentElement.dataset.theme = t;
 };
@@ -475,7 +475,7 @@ reset: () => set({ snippets: [], activeSnippetId: null, draftSpec: '' });
 - In components, **select narrowly**; use `useShallow` for object/array selections.
   Outside components, use `getState()` / `subscribe()`.
 - Split durable domain state into feature stores (`useSnippetStore`, `useDatasetStore`,
-  `useSettingsStore`); keep `useAppStore` for thin cross-cutting UI state.
+  `useUserSettingsStore`); keep `useAppStore` for thin cross-cutting UI state.
 - Put every shared-state mutation behind a named action on the store so it's testable
   without a DOM (`getState().action()`).
 - Do persistence and external sync (IndexedDB, `localStorage`, URL hash, theme) in