feat(when): Someday chip in the When picker — files into the someday pile

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01THT7qz2Nt5ibWULZ4nvfTa

app/src/components/DateField.tsx

@@ -1,5 +1,6 @@
-// Interactive date field: quick chips (Today / Tomorrow / Next week) plus an
+// Interactive date field: quick chips (Today / Tomorrow / Next week, plus an
-// expandable month calendar. Pure RN views — identical on Android, iOS, web.
+// optional Someday) and an expandable month calendar. Pure RN views —
+// identical on Android, iOS, web.
 import { useMemo, useState } from "react";
 import { Pressable, StyleSheet, Text, View } from "react-native";
 import { haptic } from "../lib/haptics";
@@ -100,11 +101,14 @@ export default function DateField({
   value,
   onChange,
   clearable,
+  someday,
 }: {
   label?: string;
   value: string | null;
   onChange: (v: string | null) => void;
   clearable?: boolean;
+  /** Offers a dateless "Someday" chip — the pile, not a day on the calendar. */
+  someday?: { active: boolean; onPress: () => void };
 }) {
   const [open, setOpen] = useState(false);
   const today = new Date();
@@ -134,6 +138,16 @@ export default function DateField({
             }}
           />
         ))}
+        {someday && (
+          <OptionChip
+            label="Someday"
+            active={someday.active}
+            onPress={() => {
+              haptic.select();
+              someday.onPress();
+            }}
+          />
+        )}
         <OptionChip
           label={value && !quick.some((q) => q.v === value) ? friendlyDate(value) : "Pick a date…"}
           active={open}

app/src/components/TaskForm.tsx

@@ -81,7 +81,20 @@ export default function TaskForm({
       icon: "today",
       placeholder: "When",
       value: d.due_date ? friendlyDate(d.due_date) : null,
-      panel: <DateField value={d.due_date} onChange={(due_date) => onChange({ due_date })} clearable />,
+      panel: (
+        <DateField
+          value={d.due_date}
+          onChange={(due_date) => onChange({ due_date })}
+          clearable
+          someday={{
+            active: d.status === "someday",
+            onPress: () =>
+              d.status === "someday"
+                ? onChange({ status: "next" })
+                : onChange({ status: "someday", due_date: null }),
+          }}
+        />
+      ),
       onClear: () => onChange({ due_date: null }),
     },
     {