feat(gif-mood): masonry wall mode with DnD + flex columns

- Wall mode: flex columns (no empty bottoms), all GIFs mixed
- DnD in wall: SortableContext on current user items only, others are fixed
- Own GIFs show drag handle, others show avatar badge
- Image min-h skeleton prevents 0-height layout slots while loading

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/gif-mood/GifMoodBoard.tsx

@@ -149,6 +149,38 @@ function DragHandle(props: React.HTMLAttributes<HTMLDivElement>) {
   );
 }
 
+function SortableWallItem({
+  sessionId,
+  item,
+  currentUserId,
+  canEdit,
+}: {
+  sessionId: string;
+  item: GifMoodItem;
+  currentUserId: string;
+  canEdit: boolean;
+}) {
+  const { attributes, listeners, setNodeRef, transform, transition, isDragging } = useSortable({
+    id: item.id,
+  });
+
+  return (
+    <div
+      ref={setNodeRef}
+      style={{ transform: CSS.Transform.toString(transform), transition }}
+      className={`group/card relative ${isDragging ? 'opacity-50 z-50' : ''}`}
+    >
+      <DragHandle {...attributes} {...listeners} />
+      <GifMoodCard
+        sessionId={sessionId}
+        item={item}
+        currentUserId={currentUserId}
+        canEdit={canEdit}
+      />
+    </div>
+  );
+}
+
 function SortableGifMoodCard({
   sessionId,
   item,
@@ -190,6 +222,7 @@ const GRID_COLS: Record<number, string> = {
   6: 'grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-6',
 };
 
+
 function GridIcon({ cols }: { cols: number }) {
   return (
     <svg width="20" height="14" viewBox="0 0 20 14" fill="none" aria-hidden>
@@ -207,6 +240,21 @@ function GridIcon({ cols }: { cols: number }) {
   );
 }
 
+function MasonryIcon() {
+  return (
+    <svg width="20" height="14" viewBox="0 0 20 14" fill="none" aria-hidden>
+      <rect x={0}  y={0} width={4} height={9}  rx={1} fill="currentColor" opacity={0.7} />
+      <rect x={0}  y={10} width={4} height={4} rx={1} fill="currentColor" opacity={0.4} />
+      <rect x={5}  y={0} width={4} height={5}  rx={1} fill="currentColor" opacity={0.7} />
+      <rect x={5}  y={6} width={4} height={8}  rx={1} fill="currentColor" opacity={0.4} />
+      <rect x={10} y={0} width={4} height={11} rx={1} fill="currentColor" opacity={0.7} />
+      <rect x={10} y={12} width={4} height={2} rx={1} fill="currentColor" opacity={0.4} />
+      <rect x={15} y={0} width={4} height={6}  rx={1} fill="currentColor" opacity={0.7} />
+      <rect x={15} y={7} width={4} height={7}  rx={1} fill="currentColor" opacity={0.4} />
+    </svg>
+  );
+}
+
 export function GifMoodBoard({
   sessionId,
   currentUserId,
@@ -217,6 +265,7 @@ export function GifMoodBoard({
   canEdit,
 }: GifMoodBoardProps) {
   const [cols, setCols] = useState(4);
+  const [masonry, setMasonry] = useState(false);
   const [, startReorderTransition] = useTransition();
   const [, startHiddenTransition] = useTransition();
 
@@ -259,6 +308,24 @@ export function GifMoodBoard({
     });
   }, [allUsers, currentUserId, owner.id]);
 
+  function handleWallDragEnd(event: DragEndEvent) {
+    const { active, over } = event;
+    if (!over || active.id === over.id) return;
+
+    const currentItems =
+      optimisticItems.length > 0 ? optimisticItems : (itemsByUser.get(currentUserId) ?? []);
+    const oldIndex = currentItems.findIndex((i) => i.id === active.id);
+    const newIndex = currentItems.findIndex((i) => i.id === over.id);
+    if (oldIndex === -1 || newIndex === -1) return;
+
+    const reordered = arrayMove(currentItems, oldIndex, newIndex);
+    setOptimisticItems(reordered);
+
+    startReorderTransition(async () => {
+      await reorderGifMoodItems(sessionId, reordered.map((i) => i.id));
+    });
+  }
+
   function handleDragEnd(event: DragEndEvent) {
     const { active, over } = event;
     if (!over || active.id === over.id) return;
@@ -277,9 +344,31 @@ export function GifMoodBoard({
     });
   }
 
+  const currentUserItems = optimisticItems.length > 0
+    ? optimisticItems
+    : (itemsByUser.get(currentUserId) ?? []);
+
+  const wallItems = useMemo(() => {
+    return sortedUsers.flatMap((user) => {
+      const isCurrentUser = user.id === currentUserId;
+      const serverItems = itemsByUser.get(user.id) ?? [];
+      const uItems = isCurrentUser && optimisticItems.length > 0 ? optimisticItems : serverItems;
+      const userRatingEntry = ratings.find((r) => r.userId === user.id);
+      if (!isCurrentUser && (uItems.length === 0 || userRatingEntry?.hidden)) return [];
+      return uItems;
+    });
+  }, [sortedUsers, itemsByUser, currentUserId, optimisticItems, ratings]);
+
+  // Distribute items into N columns round-robin so each column only takes its items' height
+  const wallColumns = useMemo(() => {
+    const columns: GifMoodItem[][] = Array.from({ length: cols }, () => []);
+    wallItems.forEach((item, i) => columns[i % cols].push(item));
+    return columns;
+  }, [wallItems, cols]);
+
   return (
     <div className="space-y-10">
-      {/* Column size control */}
+      {/* Layout controls */}
       <div className="flex justify-end">
         <div className="inline-flex items-center gap-1 rounded-xl border border-border bg-card p-1">
           {[4, 5, 6].map((n) => (
@@ -287,7 +376,7 @@ export function GifMoodBoard({
               key={n}
               onClick={() => setCols(n)}
               className={`flex items-center justify-center rounded-lg px-2.5 py-1.5 transition-all ${
-                cols === n
+                !masonry && cols === n
                   ? 'bg-primary text-primary-foreground shadow-sm'
                   : 'text-muted hover:text-foreground hover:bg-card-hover'
               }`}
@@ -296,9 +385,70 @@ export function GifMoodBoard({
               <GridIcon cols={n} />
             </button>
           ))}
+          <div className="w-px h-5 bg-border mx-0.5" />
+          <button
+            onClick={() => setMasonry((m) => !m)}
+            className={`flex items-center justify-center rounded-lg px-2.5 py-1.5 transition-all ${
+              masonry
+                ? 'bg-primary text-primary-foreground shadow-sm'
+                : 'text-muted hover:text-foreground hover:bg-card-hover'
+            }`}
+            title="Vue mur"
+          >
+            <MasonryIcon />
+          </button>
         </div>
       </div>
-      {sortedUsers.map((user, index) => {
+
+      {/* Wall mode: flex columns so each column only takes its items' height */}
+      {masonry && (
+        <DndContext
+          sensors={sensors}
+          collisionDetection={closestCenter}
+          onDragEnd={handleWallDragEnd}
+        >
+          <SortableContext
+            items={currentUserItems.map((i) => i.id)}
+            strategy={rectSortingStrategy}
+          >
+            <div className="flex gap-4 items-start">
+              {wallColumns.map((colItems, colIdx) => (
+                <div key={colIdx} className="flex-1 min-w-0 flex flex-col gap-4">
+                  {colItems.map((item) =>
+                    item.userId === currentUserId && canEdit ? (
+                      <SortableWallItem
+                        key={item.id}
+                        sessionId={sessionId}
+                        item={item}
+                        currentUserId={currentUserId}
+                        canEdit={canEdit}
+                      />
+                    ) : (
+                      <div key={item.id} className="relative group/wall">
+                        <div className="absolute top-2 left-2 z-10 opacity-80 group-hover/wall:opacity-100 transition-opacity drop-shadow-sm">
+                          <Avatar email={item.user.email} name={item.user.name} size={30} />
+                        </div>
+                        <GifMoodCard
+                          sessionId={sessionId}
+                          item={item}
+                          currentUserId={currentUserId}
+                          canEdit={canEdit}
+                        />
+                      </div>
+                    )
+                  )}
+                  {colIdx === 0 && canEdit && currentUserItems.length < GIF_MOOD_MAX_ITEMS && (
+                    <GifMoodAddForm sessionId={sessionId} currentCount={currentUserItems.length} />
+                  )}
+                </div>
+              ))}
+            </div>
+          </SortableContext>
+        </DndContext>
+      )}
+
+      {/* Grid mode: per-user sections */}
+      {!masonry && sortedUsers.map((user, index) => {
         const isCurrentUser = user.id === currentUserId;
         const serverItems = itemsByUser.get(user.id) ?? [];
         const userItems =
@@ -397,59 +547,62 @@ export function GifMoodBoard({
               </div>
             ) : null}
 
-            {/* Grid */}
-            {!showHidden && isCurrentUser && canEdit ? (
-              <DndContext
-                sensors={sensors}
-                collisionDetection={closestCenter}
-                onDragEnd={handleDragEnd}
-              >
-                <SortableContext
-                  items={userItems.map((i) => i.id)}
-                  strategy={rectSortingStrategy}
+            {/* Items */}
+            {!showHidden && (
+              isCurrentUser && canEdit ? (
+                <DndContext
+                  sensors={sensors}
+                  collisionDetection={closestCenter}
+                  onDragEnd={handleDragEnd}
                 >
-                  <div className={`grid ${GRID_COLS[cols]} gap-4 items-start`}>
-                    {userItems.map((item) => (
-                      <SortableGifMoodCard
-                        key={item.id}
-                        sessionId={sessionId}
-                        item={item}
-                        currentUserId={currentUserId}
-                        canEdit={canEdit}
-                      />
-                    ))}
-                    {canAdd && (
-                      <GifMoodAddForm sessionId={sessionId} currentCount={userItems.length} />
-                    )}
-                    {!canAdd && userItems.length === 0 && (
-                      <div className="col-span-full flex items-center justify-center rounded-2xl border border-dashed border-border/60 py-10">
-                        <p className="text-sm text-muted/60">Aucun GIF pour le moment</p>
-                      </div>
-                    )}
-                  </div>
-                </SortableContext>
-              </DndContext>
-            ) : !showHidden ? (
-              <div className={`grid ${GRID_COLS[cols]} gap-4 items-start`}>
-                {userItems.map((item) => (
-                  <GifMoodCard
-                    key={item.id}
-                    sessionId={sessionId}
-                    item={item}
-                    currentUserId={currentUserId}
-                    canEdit={canEdit}
-                  />
-                ))}
-                {!canAdd && userItems.length === 0 && (
-                  <div className="col-span-full flex items-center justify-center rounded-2xl border border-dashed border-border/60 py-10">
-                    <p className="text-sm text-muted/60">Aucun GIF pour le moment</p>
-                  </div>
-                )}
-              </div>
-            ) : null}
+                  <SortableContext
+                    items={userItems.map((i) => i.id)}
+                    strategy={rectSortingStrategy}
+                  >
+                    <div className={`grid ${GRID_COLS[cols]} gap-4 items-start`}>
+                      {userItems.map((item) => (
+                        <SortableGifMoodCard
+                          key={item.id}
+                          sessionId={sessionId}
+                          item={item}
+                          currentUserId={currentUserId}
+                          canEdit={canEdit}
+                        />
+                      ))}
+                      {canAdd && (
+                        <GifMoodAddForm sessionId={sessionId} currentCount={userItems.length} />
+                      )}
+                      {!canAdd && userItems.length === 0 && (
+                        <div className="col-span-full flex items-center justify-center rounded-2xl border border-dashed border-border/60 py-10">
+                          <p className="text-sm text-muted/60">Aucun GIF pour le moment</p>
+                        </div>
+                      )}
+                    </div>
+                  </SortableContext>
+                </DndContext>
+              ) : (
+                <div className={`grid ${GRID_COLS[cols]} gap-4 items-start`}>
+                  {userItems.map((item) => (
+                    <GifMoodCard
+                      key={item.id}
+                      sessionId={sessionId}
+                      item={item}
+                      currentUserId={currentUserId}
+                      canEdit={canEdit}
+                    />
+                  ))}
+                  {!canAdd && userItems.length === 0 && (
+                    <div className="col-span-full flex items-center justify-center rounded-2xl border border-dashed border-border/60 py-10">
+                      <p className="text-sm text-muted/60">Aucun GIF pour le moment</p>
+                    </div>
+                  )}
+                </div>
+              )
+            )}
           </section>
         );
       })}
     </div>
   );
 }
+

src/components/gif-mood/GifMoodCard.tsx

@@ -26,6 +26,7 @@ export const GifMoodCard = memo(function GifMoodCard({
   const [itemVersion, setItemVersion] = useState(item);
   const [isPending, startTransition] = useTransition();
   const [imgError, setImgError] = useState(false);
+  const [imgLoaded, setImgLoaded] = useState(false);
   const [isFocused, setIsFocused] = useState(false);
   const textareaRef = useRef<HTMLTextAreaElement>(null);
 
@@ -78,7 +79,8 @@ export const GifMoodCard = memo(function GifMoodCard({
         <img
           src={item.gifUrl}
           alt="GIF"
-          className="w-full block"
+          className={`w-full block ${imgLoaded ? '' : 'min-h-[80px]'}`}
+          onLoad={() => setImgLoaded(true)}
           onError={() => setImgError(true)}
         />
       )}