Shared Family calendar and task list; notes default to Family; phone chat and Family card fixes

- Built-in Family calendar everyone with Calendar can edit (data/family)
- Family task list shared by everyone with Tasks
- New notes and lists start shared with the family
- Phone chat sized above the bottom bar and mini player so the message box is visible
- Family page cards no longer overflow on long chat previews
- Tests added and updated

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

public/tasks.js

@@ -96,7 +96,7 @@ function taskSheet(t, cur, list, viewCur, viewList) { // (cur and list: the task
 }
 
 function newListSheet(lists, list) {
-  const mine = lists.filter(l => l.local && l.id !== 'local:inbox');
+  const mine = lists.filter(l => l.local && l.id !== 'local:inbox' && !l.shared);
   const el = openSheet('Lists', '', `${mine.length ? `<div class="list" style="background:var(--panel2);border:0">${mine.map(l => `<div class="row"><span class="grow"><b>${esc(l.name)}</b></span><button class="btn danger" data-rm="${esc(l.id)}" style="min-height:36px">Delete</button></div>`).join('')}</div>` : ''}
     <form id="lf"><label for="ln">New list</label><input type="text" id="ln" placeholder="Groceries" autocomplete="off" required>
     <div class="bar"><button class="btn ghost" type="button" id="sx" style="flex:1;justify-content:center">Close</button><button class="btn" style="flex:1;justify-content:center">Add list</button></div><div class="err" id="le"></div></form>`);