feat: add calendar date picker, nav icons, and input-focused keyboard scrolling

src/components/DatePickerModal.js

@@ -0,0 +1,93 @@
+import React, { useMemo, useState } from 'react';
+import { Modal, Pressable, Text, View } from 'react-native';
+import { styles } from '../styles';
+import { todayYMD } from '../utils/date';
+
+const WEEKDAYS = ['Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa', 'Su'];
+
+function toYMD(date) {
+  const y = date.getFullYear();
+  const m = `${date.getMonth() + 1}`.padStart(2, '0');
+  const d = `${date.getDate()}`.padStart(2, '0');
+  return `${y}-${m}-${d}`;
+}
+
+function parseFromYMD(value) {
+  if (!value || !/^\d{4}-\d{2}-\d{2}$/.test(value)) return new Date();
+  const date = new Date(`${value}T00:00:00`);
+  return Number.isNaN(date.getTime()) ? new Date() : date;
+}
+
+function monthLabel(date) {
+  return date.toLocaleDateString(undefined, { month: 'long', year: 'numeric' });
+}
+
+function buildMonthGrid(viewDate) {
+  const first = new Date(viewDate.getFullYear(), viewDate.getMonth(), 1);
+  const startWeekday = (first.getDay() + 6) % 7;
+  const daysInMonth = new Date(viewDate.getFullYear(), viewDate.getMonth() + 1, 0).getDate();
+
+  const cells = [];
+  for (let i = 0; i < startWeekday; i += 1) cells.push(null);
+  for (let day = 1; day <= daysInMonth; day += 1) {
+    cells.push(new Date(viewDate.getFullYear(), viewDate.getMonth(), day));
+  }
+
+  while (cells.length % 7 !== 0) cells.push(null);
+  return cells;
+}
+
+export default function DatePickerModal({ visible, value, onClose, onSelect, title = 'Pick date' }) {
+  const [viewDate, setViewDate] = useState(parseFromYMD(value || todayYMD()));
+
+  const grid = useMemo(() => buildMonthGrid(viewDate), [viewDate]);
+  const selected = value || todayYMD();
+
+  const goMonth = (diff) => {
+    setViewDate((prev) => new Date(prev.getFullYear(), prev.getMonth() + diff, 1));
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="fade" onRequestClose={onClose}>
+      <View style={styles.dateModalBackdrop}>
+        <View style={styles.dateModalCard}>
+          <View style={styles.sectionRow}>
+            <Text style={styles.sectionTitle}>{title}</Text>
+            <Pressable onPress={onClose}>
+              <Text style={styles.closeText}>Close</Text>
+            </Pressable>
+          </View>
+
+          <View style={styles.calendarHeader}>
+            <Pressable style={styles.calendarNavBtn} onPress={() => goMonth(-1)}>
+              <Text style={styles.calendarNavText}>‹</Text>
+            </Pressable>
+            <Text style={styles.calendarMonthText}>{monthLabel(viewDate)}</Text>
+            <Pressable style={styles.calendarNavBtn} onPress={() => goMonth(1)}>
+              <Text style={styles.calendarNavText}>›</Text>
+            </Pressable>
+          </View>
+
+          <View style={styles.calendarWeekRow}>
+            {WEEKDAYS.map((w) => (
+              <Text key={w} style={styles.calendarWeekday}>{w}</Text>
+            ))}
+          </View>
+
+          <View style={styles.calendarGrid}>
+            {grid.map((cell, idx) => {
+              if (!cell) return <View key={`empty-${idx}`} style={styles.calendarCell} />;
+              const ymd = toYMD(cell);
+              const isSelected = ymd === selected;
+              return (
+                <Pressable key={ymd} style={[styles.calendarCell, isSelected && styles.calendarCellActive]} onPress={() => onSelect(ymd)}>
+                  <Text style={[styles.calendarCellText, isSelected && styles.calendarCellTextActive]}>{cell.getDate()}</Text>
+                </Pressable>
+              );
+            })}
+          </View>
+        </View>
+      </View>
+    </Modal>
+  );
+}