Chores: claim from the pool; admin picks who appears on the family board

- "Anyone" chores get Take it / Put back; a claimed chore is that person's for the day
- Per-person "Show on the family board" switch controls board tiles and family chore progress
- Tests and README updated

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

README.md

@@ -184,7 +184,7 @@ Files are kept in the data folder under `mystore/` (up to 1 GB each; extensions
 
 **Notes** (turn it on per person): notes and checklists that are private, shared with the whole family, or shared with chosen people. Anyone it is shared with can edit it. Checklist items change one at a time (tick, add, edit, remove), so two people ticking the same list never overwrite each other, ticked items say who ticked them, and an open list follows other people's changes every few seconds. Text edits are checked against a revision, so a stale edit is refused instead of overwriting someone else's. Pin, colour, archive, search and filters (lists, notes, mine, shared, archived), ready-made lists (grocery, packing, weekend to-do), *Share to Chat*, and *Send the open items to Tasks*. Only the person who made a note (or an admin) changes who it is shared with or deletes it.
 
-**Chores** (turn it on per person): jobs that repeat daily, on weekdays, on chosen days of the week, weekly, monthly or happen once, given to one or more people or to anyone. Each person ticks off their own (an admin can tick for someone), finished chores earn points, and the board adds up the week and month. Only an admin adds or changes chores. Kept in `data/chores.json`.
+**Chores** (turn it on per person): jobs that repeat daily, on weekdays, on chosen days of the week, weekly, monthly or happen once, given to one or more people or to anyone. Each person ticks off their own (an admin can tick for someone), finished chores earn points, and the board adds up the week and month. Only an admin adds or changes chores. A chore given to *anyone* is a pool: a person taps **Take it** to claim it for the day (it moves under their name, and nobody else can tick it; **Put back** returns it to the pool). Kept in `data/chores.json`.
 
 **Family** (the page every account has next to Home): today and tomorrow's calendar, your chores and everyone's progress, the shopping list, shared notes and lists, recent chats and the tasks due this week. Each card only shows if the person has that part of the hub.
 
@@ -196,7 +196,7 @@ Files are kept in the data folder under `mystore/` (up to 1 GB each; extensions
 
 **Notifications** (the bell on Home and Family): a list of what you have not seen yet: chat messages (one line per conversation, with a count), reminders for tasks, events and mail, and family announcements. Tap one to open it; mark all read or clear. Kept per person in `inbox.json`.
 
-**Family devices** (Settings, under Passkeys): for a kitchen tablet or the family computer. An admin turns on *Make this a family device* while signed in on it; from then on it opens on the **family board** (announcement, today's family calendar, chores with progress, shopping list, family tasks and notes) and a row of name tiles, children marked **KID**. Tap your name: a child signs in with one tap, everyone else enters a PIN they set in Settings (five wrong tries lock that person for five minutes; there is also a passkey link). A label with your name and **Switch user** stays on screen, and the device goes back to the board after five idle minutes (music playing keeps it signed in). Sessions on a family device last 30 minutes at a time, not months. Turn it off from the same place. The Family calendar and Family task list are shared by everyone and appear on the board.
+**Family devices** (Settings, under Passkeys): for a kitchen tablet or the family computer. An admin turns on *Make this a family device* while signed in on it; from then on it opens on the **family board** (announcement, today's family calendar, chores with progress, shopping list, family tasks and notes) and a row of name tiles, children marked **KID**. Tap your name: a child signs in with one tap, everyone else enters a PIN they set in Settings (five wrong tries lock that person for five minutes; there is also a passkey link). A label with your name and **Switch user** stays on screen, and the device goes back to the board after five idle minutes (music playing keeps it signed in). Sessions on a family device last 30 minutes at a time, not months. Turn it off from the same place. The admin picks who appears on the board (a **Show on the family board** switch in each person's settings; people left off do not get a tile or show in family chore progress). The Family calendar and Family task list are shared by everyone and appear on the board.
 
 On a tablet or with the menu collapsed, the menu rail shows icons only (the name appears on hover) when the window is not tall enough for a label under every icon.