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/chat-view.js

@@ -340,3 +340,15 @@ async function chAnnounceCard(el) {
   el.innerHTML = `<div class="annc"><span class="ic" style="background:var(--accent)">${icon('chat')}</span><span class="grow"><small>Family announcement · ${esc(a.by)}</small><b>${esc(a.text)}</b></span><button class="ibtn" id="ancx" aria-label="Dismiss">${icon('x')}</button></div>`;
   el.querySelector('#ancx').onclick = () => { try { localStorage.setItem('ch_ann_gone:' + (ME ? ME.id : ''), a.id); } catch {} el.innerHTML = ''; };
 }
+
+/** On a phone the open chat has to end above the mini player and the bottom bar, or the message box lands off screen: size it from what is really at the bottom. */
+function chFit() {
+  const m = chMounted() && ch.root.querySelector('.sgm'); if (!m || m.offsetParent === null) return;
+  if (window.innerWidth >= 1024) { m.style.height = ''; return; }
+  let bottom = window.visualViewport ? window.visualViewport.height : window.innerHeight;
+  const top0 = m.getBoundingClientRect().top; // (look up from the screen's edge for the first spot that is page content, not the bottom bar or mini player)
+  for (let y = Math.floor(bottom) - 2; y > top0 + 130; y -= 4) { const hit = document.elementsFromPoint(innerWidth / 2, y).find(e => !e.closest('.sgm')); const covers = hit && !hit.closest('#view'); if (!covers) { bottom = y + 4; break; } }
+  const top = m.getBoundingClientRect().top; m.style.height = Math.max(260, Math.floor(bottom - top - 10)) + 'px';
+}
+window.addEventListener('resize', chFit); if (window.visualViewport) window.visualViewport.addEventListener('resize', chFit);
+setInterval(chFit, 700);