fix: make the remove cross on a participant chip easier to tap

src/components/calendar/ParticipantInput.tsx

@@ -14,7 +14,10 @@ import { useContactsStore, type RecipientSuggestion } from '../../stores/contact
 import { useLocaleStore } from '../../stores/locale-store';
 import type { Attendee } from '../../lib/calendar-participants';
 import { participantSuggestions, participantsFromSuggestion } from '../../lib/calendar-participant-suggestions';
-import { participantRemoveAccessibilityLabel } from '../../lib/calendar-a11y';
+import { participantRemoveAccessibilityLabel, touchSlop } from '../../lib/calendar-a11y';
+
+/** The cross on a chip: 12 dp drawn, 44 dp to tap. */
+const REMOVE_ICON = 12;
 
 interface ParticipantInputProps {
   attendees: Attendee[];
@@ -91,11 +94,11 @@ export function ParticipantInput({ attendees, onAdd, onRemove }: ParticipantInpu
               </Text>
               <Pressable
                 onPress={() => onRemove(a.email)}
-                hitSlop={6}
+                hitSlop={touchSlop(REMOVE_ICON)}
                 accessibilityRole="button"
                 accessibilityLabel={participantRemoveAccessibilityLabel(a, t)}
               >
-                <X size={12} color={c.textMuted} />
+                <X size={REMOVE_ICON} color={c.textMuted} />
               </Pressable>
             </View>
           ))}

src/lib/__tests__/calendar-a11y.test.ts

@@ -12,6 +12,7 @@ import {
   eventAccessibilityLabel,
   monthButtonAccessibilityLabel,
   participantRemoveAccessibilityLabel,
+  touchSlop,
 } from '../calendar-a11y';
 import { useSettingsStore } from '../../stores/settings-store';
 import { gregorianCalendar, jalaliCalendar } from '../calendar-system';
@@ -85,6 +86,18 @@ describe('header and chip buttons', () => {
     expect(participantRemoveAccessibilityLabel({ name: '', email: 'ana@example.com' }, t)).toBe('Remove ana@example.com');
   });
 
+  it('grows the 12 dp cross on a participant chip to a 44 dp touch target', async () => {
+    expect(touchSlop(12)).toBe(16);
+    expect(12 + 2 * touchSlop(12)).toBeGreaterThanOrEqual(44);
+    expect(touchSlop(13)).toBe(16);
+    expect(touchSlop(48)).toBe(0);
+    const fs = await import('node:fs');
+    const path = await import('node:path');
+    const chips = fs.readFileSync(path.resolve(__dirname, '../../components/calendar/ParticipantInput.tsx'), 'utf8');
+    expect(chips).toMatch(/const REMOVE_ICON = 12;/);
+    expect(chips).toMatch(/hitSlop=\{touchSlop\(REMOVE_ICON\)\}[\s\S]{0,200}<X size=\{REMOVE_ICON\}/);
+  });
+
   it('is what the calendar header and the participant chips use', async () => {
     const fs = await import('node:fs');
     const path = await import('node:path');

src/lib/calendar-a11y.ts

@@ -21,6 +21,14 @@ export function monthButtonAccessibilityLabel(date: Date, system: CalendarSystem
   return t('calendar.change_month_named', '{month}, change month', { month: monthTitle(date, system, locale, true) });
 }
 
+/** The smallest touch target, in dp (WCAG 2.5.5, Android's 48 dp guideline rounded to Apple's 44 pt). */
+export const MIN_TOUCH_TARGET = 44;
+
+/** The hitSlop that grows an icon of `size` dp to a `target` dp touch area on every side. */
+export function touchSlop(size: number, target: number = MIN_TOUCH_TARGET): number {
+  return Math.max(0, Math.ceil((target - size) / 2));
+}
+
 /** "Remove Ana" for the cross on an invited participant's chip (webmail recipient_remove_named). */
 export function participantRemoveAccessibilityLabel(attendee: { name?: string; email: string }, t: Translate): string {
   return t('calendar.participants.remove_named', 'Remove {name}', { name: attendee.name?.trim() || attendee.email });