fix(BUG-15): DisplayView no longer re-sorts participants by initiative

DisplayView called sortParticipantsByInitiative() on visibleParticipants,
ignoring DM drag order. 1-list model = participants[] IS display source.
After cross-init drag, player view diverged from AdminView/turnOrderIds.

Repro: round 4 replay. [reorder Summon1(10)→before Merchant(11)] made
turnOrderIds = [...,Summon2,Summon1,Merchant,OrcBoss]. AdminView correct.
DisplayView re-sorted = Summon2,Merchant,Summon1 (init order) = visually
Merchant appeared between Summon2 and Summon1, NOT at end. DM confused.

Fix: removed sort. DisplayView now renders participants[] order directly
(filter inactive monsters only), matching AdminView line 1222.

Test: RED → GREEN (src/tests/DisplayView.drag-order.test.js). Seeds 3
monsters in drag order [High:20, Low:10, Mid:11]. Asserts DOM order =
participants[] order, not init-sorted. No DisplayView regressions.

TODO.md

@@ -182,6 +182,7 @@ REWORK_PLAN.md.
 - [x] BUG-5: fixed (1-list model, 500 rounds clean)
 - [x] BUG-6: fixed structurally (1-list model)
 - [x] BUG-12: fixed — campaign selection follows activeDisplay
+- [x] BUG-15: fixed — DisplayView no longer re-sorts (drag order preserved)
 - [ ] BUG-8: ws adapter reconnect
 - [ ] BUG-10: deact+reactivate double-act
 - [ ] BUG-11: FE Combat.scenario crash

src/App.js

@@ -2500,9 +2500,10 @@ function DisplayView() {
 
   let participantsToRender = [];
   if (participants) {
-    // Hide inactive monsters (pre-staged/summoned reserves) from the player view
+    // 1-list model: participants[] IS the display order (DM drag = source of
-    const visibleParticipants = participants.filter(p => p.isActive || p.type !== 'monster');
+    // truth). Do NOT re-sort by initiative — that diverges from AdminView /
-    participantsToRender = sortParticipantsByInitiative(visibleParticipants, visibleParticipants);
+    // turnOrderIds after any cross-init drag (BUG-15).
+    participantsToRender = participants.filter(p => p.isActive || p.type !== 'monster');
   }
 
   const displayStyles = campaignBackgroundUrl

src/tests/DisplayView.drag-order.test.js

@@ -0,0 +1,63 @@
+// RED test: DisplayView must render participants in turnOrderIds (drag) order,
+// NOT re-sort by initiative. 1-list model: participants[] = display source.
+// Bug: DisplayView line ~2505 calls sortParticipantsByInitiative(), ignoring
+// DM drag order. After cross-init drag, display diverges from AdminView/turnOrderIds.
+import React from 'react';
+import { render, waitFor, screen } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import App from '../App';
+import { MOCK_DB } from '../__mocks__/firebase/_mock-db';
+import { resetAdapterCalls } from '../storage/firebase';
+
+function seedDragOrder() {
+  const campaignPath = 'artifacts/ttrpg-initiative-tracker-default/public/data/campaigns/c1';
+  const encounterPath = 'artifacts/ttrpg-initiative-tracker-default/public/data/campaigns/c1/encounters/e1';
+  const activeDisplayPath = 'artifacts/ttrpg-initiative-tracker-default/public/data/activeDisplay/status';
+  // Three monsters, init-sorted would be: high(20), mid(11), low(10).
+  // But participants[] = DRAG order: low BEFORE mid (DM dragged across init).
+  const participants = [
+    { id: 'high', name: 'High', type: 'monster', initiative: 20, currentHp: 10, maxHp: 10, isActive: true },
+    { id: 'low', name: 'Low', type: 'monster', initiative: 10, currentHp: 10, maxHp: 10, isActive: true },
+    { id: 'mid', name: 'Mid', type: 'monster', initiative: 11, currentHp: 10, maxHp: 10, isActive: true },
+  ];
+  MOCK_DB.set(campaignPath, { name: 'Camp', playerDisplayBackgroundUrl: '' });
+  MOCK_DB.set(encounterPath, {
+    name: 'Enc',
+    participants,
+    turnOrderIds: participants.map(p => p.id),
+    round: 1,
+    currentTurnParticipantId: 'high',
+    isStarted: true,
+  });
+  MOCK_DB.set(activeDisplayPath, { activeCampaignId: 'c1', activeEncounterId: 'e1', hidePlayerHp: false });
+}
+
+describe('DisplayView drag order (BUG-15)', () => {
+  beforeEach(() => {
+    window.history.replaceState({}, '', '/display');
+    global.alert = jest.fn();
+    window.open = jest.fn();
+    // jsdom lacks scrollIntoView (DisplayView auto-scrolls current actor)
+    Element.prototype.scrollIntoView = jest.fn();
+    resetAdapterCalls();
+  });
+  afterEach(() => {
+    window.history.replaceState({}, '', '/');
+  });
+
+  test('renders participants in participants[] order, not init-sorted', async () => {
+    seedDragOrder();
+    render(<App />);
+
+    // wait for participant names to render
+    await waitFor(() => {
+      expect(screen.getAllByText(/High|Mid|Low/i).length).toBeGreaterThanOrEqual(3);
+    }, { timeout: 3000 });
+
+    // collect name elements in DOM order (strip Current marker)
+    const names = screen.getAllByText(/High|Mid|Low/i).map(el => el.textContent.replace(/\(Current\)/i, '').trim());
+    // participants[] order = High, Low, Mid (drag moved Low before Mid).
+    // Display must mirror this. Init-sorted would be High, Mid, Low.
+    expect(names).toEqual(['High', 'Low', 'Mid']);
+  });
+});