Band Lineup 1.12.0: Sync keeps your moves and puts each person in one spot

Two Sync problems found by checking the real October 25 plan against the
board:

- Someone on the plan twice (Mike Powell is Leader and Guitar [Acoustic])
  could fill two spots, pushing a real player off the board. Which spot
  the duplicate took depended on the order Planning Center returned
  people, so it only happened some weeks. Assignment now uses each person
  once.
- Moving a synced person to another spot was undone by the next Sync,
  which re-placed everyone it had filled. A move is now a hand placement
  for the current plan and Sync leaves it alone.

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

modules/band-lineup/server.js

@@ -530,8 +530,8 @@ module.exports = {
         const openIdx = []; const manualNames = new Set();
         for (let i = 0; i < eff.length; i += 1) {
           const e = board[String(i)];
-          if (e && (e.personId || e.name) && e.plan === planId) {
-            const nm = e.personId ? (library[e.personId] && library[e.personId].name) : e.name;
+          if (e && (e.personId || e.name || e.pco) && e.plan === planId) {
+            const nm = e.pco ? e.pco.name : e.personId ? (library[e.personId] && library[e.personId].name) : e.name;
             if (nm) manualNames.add(normName(nm));
           } else openIdx.push(i);
         }
@@ -675,6 +675,10 @@ module.exports = {
         const from = String(p.get('from') || ''); const to = String(p.get('to') || '');
         if (!/^\d+$/.test(from) || !/^\d+$/.test(to) || from === to) return json(res, 400, { error: 'Bad move.' });
         const a = current.board[from]; const b = current.board[to];
+        // Moving a spot is a hand placement for this plan: Sync must not move it back.
+        const plan = current.planId();
+        if (a) a.plan = plan;
+        if (b) b.plan = plan;
         if (a === undefined) delete current.board[to]; else current.board[to] = a;
         if (b === undefined) delete current.board[from]; else current.board[from] = b;
         current.saveBoard(); current.rebuildLocal();