docs: amend plan to reflect code-review fixes

Tasks 8/10/11 received review fixes during execution; the plan's code
blocks are updated to match what shipped:
- Task 8: drag controller handles pointercancel + idempotent start.
- Task 10: palette pieces are plain spans + svelte-ignore (no
  focusable-but-not-operable role/tabindex).
- Task 11: phantom-load effect keyed on gameId; drag ghost gated.

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

docs/superpowers/plans/2026-05-18-table-fidelity-features.md

@@ -873,6 +873,12 @@ function makeDrag() {
   let suppressClickOn: Square | null = null;
   const THRESHOLD = 6;
 
+  function detach() {
+    window.removeEventListener('pointermove', onMove);
+    window.removeEventListener('pointerup', onUp);
+    window.removeEventListener('pointercancel', onCancel);
+  }
+
   function onMove(e: PointerEvent) {
     if (!state.active) return;
     state.x = e.clientX;
@@ -882,15 +888,23 @@ function makeDrag() {
     }
   }
 
+  // pointercancel fires instead of pointerup when the browser/OS takes over
+  // the gesture (common on touch). Abort the drag: clean up, drop nothing.
+  function onCancel() {
+    detach();
+    state.active = null;
+    state.moved = false;
+  }
+
   function onUp(e: PointerEvent) {
-    window.removeEventListener('pointermove', onMove);
-    window.removeEventListener('pointerup', onUp);
+    detach();
     const src = state.active;
     const wasDrag = state.moved;
     state.active = null;
     state.moved = false;
     if (!src || !wasDrag) return; // a tap — the board click handler deals with it
 
+    // elementFromPoint returns null off-viewport — treated as an off-board drop.
     const el = document.elementFromPoint(e.clientX, e.clientY);
     const sqEl = el?.closest('[data-square]') as HTMLElement | null;
     const target = sqEl?.dataset.square as Square | undefined;
@@ -907,6 +921,7 @@ function makeDrag() {
   }
 
   function start(src: DragSource, e: PointerEvent) {
+    detach(); // idempotency — drop any listeners from an unfinished prior drag
     suppressClickOn = null;
     state.active = src;
     state.x = startX = e.clientX;
@@ -914,6 +929,7 @@ function makeDrag() {
     state.moved = false;
     window.addEventListener('pointermove', onMove);
     window.addEventListener('pointerup', onUp);
+    window.addEventListener('pointercancel', onCancel);
   }
 
   /** The board calls this first in its square-click handler. */
@@ -1095,11 +1111,11 @@ Create `packages/client/src/lib/PhantomPalette.svelte`:
   <span class="hint muted">Drag onto your board — your guess of where the opponent is.</span>
   <div class="pieces">
     {#each TYPES as t (t)}
+      <!-- Pointer-only drag source — same deliberate a11y trade-off as the
+           phantom spans in Board.svelte (no keyboard drag interaction). -->
+      <!-- svelte-ignore a11y_no_static_element_interactions -->
       <span
         class="pp pp-{oppColor}"
-        role="button"
-        tabindex="0"
-        aria-label={`place ${t}`}
         onpointerdown={(e) => { e.preventDefault(); phantomDrag.start({ kind: 'palette', type: t }, e); }}
       >{pieceGlyph({ color: oppColor, type: t })}</span>
     {/each}
@@ -1183,14 +1199,17 @@ After the existing `const turnLabel = ...` derived block, add:
     return a && phantomDrag.state.moved ? a.type : null;
   });
 
-  // Load the phantom layer once `you` is known (blind games only).
-  let phantomsLoaded = $state(false);
+  // Load the phantom layer when `you` is known (blind games only). Keyed on
+  // gameId — like the connection effect — so it reloads if this <Game>
+  // instance is reused for a different game without a remount.
+  let loadedFor: string | null = $state(null);
   $effect(() => {
-    if (phantomsLoaded) return;
+    const id = gameId;
     const you = game.state.you;
+    if (loadedFor === id) return;
     if (you && game.state.mode === 'blind') {
-      untrack(() => phantoms.loadForGame(gameId, you));
-      phantomsLoaded = true;
+      untrack(() => phantoms.loadForGame(id, you));
+      loadedFor = id;
     }
   });
 
@@ -1234,7 +1253,7 @@ Replace the `<div class="board-area">...</div>` block with:
 Immediately after the closing `</div>` of `<div class="game-layout" ...>` (and before the `{#if pendingPromotion ...}` block), add:
 
 ```svelte
-{#if dragGhost}
+{#if phantomLayerEnabled && dragGhost}
   <div
     class="drag-ghost piece-{oppColor}"
     style="left: {phantomDrag.state.x}px; top: {phantomDrag.state.y}px;"