fix: call a sharee without a name unknown person in every share sheet

src/components/files/ShareSheet.tsx

@@ -21,6 +21,7 @@ import { spacing, radius, typography, type ThemePalette } from '../../theme/toke
 import { useColors } from '../../theme/colors';
 import { useLocaleStore } from '../../stores/locale-store';
 import { MODAL_ORIENTATIONS } from '../../lib/modal-orientations';
+import { unknownPersonLabel } from '../sharing/unknown-person';
 import { useSheetInsets } from '../../lib/use-layout';
 import { useSheetBottomInset } from '../../lib/sheet-bottom-inset';
 
@@ -172,7 +173,7 @@ export default function ShareSheet({ node, onClose, onChanged }: ShareSheetProps
     // Stalwart 1.0 with directory queries off hides every principal the user
     // has no relationship with, so a sharee may have no name.
     const unresolved = !p && !loadingPrincipals;
-    return p?.description || p?.name || (unresolved ? t('sharing.unknown_user', 'Unknown user') : principalId);
+    return p?.description || p?.name || (unresolved ? unknownPersonLabel(t) : principalId);
   };
 
   const renderPrincipalLabel = (principalId: string) => {

src/components/sharing/ShareCollectionSheet.tsx

@@ -21,6 +21,7 @@ import { spacing, radius, typography, type ThemePalette } from '../../theme/toke
 import { useColors } from '../../theme/colors';
 import { useLocaleStore } from '../../stores/locale-store';
 import { MODAL_ORIENTATIONS } from '../../lib/modal-orientations';
+import { unknownPersonLabel } from './unknown-person';
 import { useSheetInsets } from '../../lib/use-layout';
 import { useSheetBottomInset } from '../../lib/sheet-bottom-inset';
 
@@ -200,7 +201,7 @@ export function ShareCollectionSheet<R extends object>({
     return (
       <View style={styles.principalInfo}>
         <Text style={styles.principalName} numberOfLines={1}>
-          {p?.description || p?.name || (unresolved ? t('sharing.unknown_user', 'Unknown user') : principalId)}
+          {p?.description || p?.name || (unresolved ? unknownPersonLabel(t) : principalId)}
         </Text>
         {/* Never the id in its place: Stalwart 1.0's are a letter or two
             ("e") and read as a broken address. */}

src/components/sharing/__tests__/unknown-person.test.ts

@@ -0,0 +1,25 @@
+import { describe, expect, it } from 'vitest';
+import fs from 'node:fs';
+import path from 'node:path';
+import { unknownPersonLabel } from '../unknown-person';
+import { principalRowDisplay } from '../../../lib/delegation/display';
+
+// Settings > Sharing said "Unknown person", the folder share sheet "Unknown user".
+
+const t = (_key: string, fallback?: string) => fallback ?? '';
+const read = (rel: string) => fs.readFileSync(path.resolve(__dirname, '..', '..', '..', rel), 'utf8');
+
+describe('a sharee without a name', () => {
+  it('reads like Settings > Sharing', () => {
+    expect(unknownPersonLabel(t)).toBe('Unknown person');
+    expect(unknownPersonLabel((key) => key)).toBe(principalRowDisplay(null, (key) => key).name);
+  });
+
+  it('is what the folder, calendar, address book and file share sheets show', () => {
+    for (const file of ['components/sharing/ShareCollectionSheet.tsx', 'components/files/ShareSheet.tsx']) {
+      const src = read(file);
+      expect(src, file).not.toMatch(/sharing\.unknown_user|Unknown user/);
+      expect(src, file).toMatch(/unresolved \? unknownPersonLabel\(t\) : principalId/);
+    }
+  });
+});

src/components/sharing/unknown-person.ts

@@ -0,0 +1,10 @@
+type Translate = (key: string, fallback?: string) => string;
+
+/**
+ * A sharee the server shows no name for (Stalwart 1.0 with directory queries
+ * off). One wording everywhere: Settings > Sharing (lib/delegation/display)
+ * said "Unknown person", the folder and file share sheets "Unknown user".
+ */
+export function unknownPersonLabel(t: Translate): string {
+  return t('delegates.unknown_person', 'Unknown person');
+}