Add About & Privacy and Donate modals (M6, §01)

src/app/modals/modal-registry.ts

@@ -10,16 +10,17 @@
  * single shell-level Save/Cancel doesn't fit). The registry therefore omits
  * `hasError`/`getError` (validity is the modal's own concern) and keeps only
  * `getState` for unsaved-change detection on close. The registry is a partial
- * map: modals land milestone by milestone (about/donate → M6, chartBuilder → M4),
- * so only the implemented ones are registered here. Settings is deliberately NOT
+ * map — only the implemented ones are registered here. Settings is deliberately NOT
  * a modal — preferences are distributed to per-pane disclosure popovers (spec §07;
  * see components/SettingsPopover).
  */
 
 import type { ComponentType } from 'react';
 import type { ActiveModal, ModalName } from './types';
+import { AboutModal } from '../components/AboutModal';
 import { ChartBuilderModal } from '../components/ChartBuilderModal';
 import { DatasetsModal } from '../components/DatasetsModal';
+import { DonateModal } from '../components/DonateModal';
 import { ExtractModal } from '../components/ExtractModal';
 import { useChartBuilderStore } from '../stores/ChartBuilderStore';
 import { useDatasetStore } from '../stores/DatasetStore';
@@ -77,6 +78,20 @@ export const MODAL_REGISTRY: Partial<Record<ModalName, ModalConfig>> = {
     isUrlNavigable: true,
     init: (datasetId) => useChartBuilderStore.getState().init(datasetId ? Number(datasetId) : null),
   },
+
+  // Pure info modals — no state, no validity check, no discard prompt on close.
+  // `about` is URL-navigable (reload-restore); `donate` is not (spec §01E hash
+  // table omits both, but `about` is still a permanent, bookmark-worthy surface).
+  about: {
+    name: 'about',
+    title: 'About & Help',
+    component: AboutModal,
+  },
+  donate: {
+    name: 'donate',
+    title: 'Donate',
+    component: DonateModal,
+  },
 };
 
 export const getModalConfig = (name: ActiveModal): ModalConfig | undefined =>