v2.0.14 — ghost + spinner on card move

Moving a card to another bucket took a visible round-trip (PATCH +
reloadAll) during which the card sat unchanged in the source bucket,
leaving the user wondering if the drop registered. Now every
bucket-move path marks the affected cards `.card-moving` as soon as
the action fires: 50% opacity, dark scrim and a centred accent-ring
spinner. The next renderBoard() rebuilds the DOM so the class comes
off automatically — no explicit cleanup needed.

Call sites:
- drag-drop onto a bucket tile (single + multi-select)
- drag onto an existing bucket to nest it (auto-super-bucket create)
- context-menu → Bucket → <target>

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/js/modules/context-menu.js

@@ -416,7 +416,13 @@ export function showContextMenu(x, y, card) {
     }));
 
     grid.querySelectorAll('[data-ctx-color]').forEach(btn => btn.addEventListener('click', async e => { e.stopPropagation(); hideContextMenu(); pushCardEdit('color', card.id, { color: card.color }); await api(`api/cards/${card.id}`, { method: 'PATCH', body: { color: btn.dataset.ctxColor } }); await window._reloadAll(); }));
-    buckets.querySelectorAll('[data-ctx-bucket]').forEach(btn => btn.addEventListener('click', async e => { e.stopPropagation(); hideContextMenu(); pushCardEdit('bucket', card.id, { bucket_id: card.bucket_id }); await api(`api/cards/${card.id}`, { method: 'PATCH', body: { bucket_id: btn.dataset.ctxBucket || null } }); await window._reloadAll(); }));
+    buckets.querySelectorAll('[data-ctx-bucket]').forEach(btn => btn.addEventListener('click', async e => {
+        e.stopPropagation(); hideContextMenu();
+        pushCardEdit('bucket', card.id, { bucket_id: card.bucket_id });
+        window._markCardsMoving?.([card.id]);
+        await api(`api/cards/${card.id}`, { method: 'PATCH', body: { bucket_id: btn.dataset.ctxBucket || null } });
+        await window._reloadAll();
+    }));
     members.querySelectorAll('[data-ctx-member]').forEach(btn => btn.addEventListener('click', e => { e.stopPropagation(); if (e.target.closest('[data-ctx-kick]')) return; hideContextMenu(); window._openDetail(btn.dataset.ctxMember); }));
     members.querySelectorAll('[data-ctx-kick]').forEach(btn => btn.addEventListener('click', async e => { e.stopPropagation(); hideContextMenu(); await api(`api/cards/${btn.dataset.ctxKick}`, { method: 'PATCH', body: { parent_id: null } }); await window._reloadAll(); }));
 }