Allow linking an existing toolbox from the game drawer

website/public/data/site.json

@@ -1794,6 +1794,15 @@
     ]
   },
   "toolboxes": {
+    "drawer": {
+      "emptyText": "Aucune toolbox associée à cette page jeu.",
+      "createLabel": "Créer et associer",
+      "linkExistingTitle": "Ou associer une toolbox déjà existante",
+      "selectLabel": "Toolbox disponible",
+      "selectPlaceholder": "Choisir une toolbox",
+      "noAvailable": "Aucune toolbox disponible",
+      "linkLabel": "Associer"
+    },
     "storageStatus": {
       "loadingTitle": "Chargement des données locales",
       "mediaLoadingMessage": "Chargement des médias…",

website/src/features/toolboxes/ToolboxPages.jsx

@@ -486,7 +486,7 @@ export function ToolboxDrawer({ gameId, game, siteContent, toolboxes, links, act
             <button className="drawer-close-button nds-icon-button" data-size="sm" onClick={() => actions.setDrawerGameId("")} aria-label="Fermer" title="Fermer"><Icon name="close" /></button>
           </header>
           {toolbox ? <ToolboxView siteContent={siteContent} toolbox={toolbox} toolboxGame={game} embedded actions={actions} storageUsage={storageUsage} storageReady={storageReady} getModuleData={getModuleData} updateToolbox={updateToolbox} updateModuleData={updateModuleData} addImageFiles={addImageFiles} guideChecklist={guideChecklist} /> : (
-            <div className="empty nds-empty-state"><p>Aucune toolbox associée à cette page jeu.</p><button className="nds-button" data-size="sm" data-variant="primary" onClick={() => actions.setCreateModal({ gameId })}>Créer et associer</button></div>
+            <ToolboxDrawerEmptyState gameId={gameId} toolboxes={toolboxes} links={links} actions={actions} content={siteContent.toolboxes.drawer} />
           )}
           <StorageQuota usage={storageUsage} />
         </div>
@@ -495,6 +495,42 @@ export function ToolboxDrawer({ gameId, game, siteContent, toolboxes, links, act
   );
 }
 
+function ToolboxDrawerEmptyState({ gameId, toolboxes, links, actions, content }) {
+  const linkedToolboxIds = useMemo(() => new Set(Object.values(links).filter(Boolean)), [links]);
+  const availableToolboxes = useMemo(
+    () => toolboxes.filter((toolbox) => !linkedToolboxIds.has(toolbox.id)),
+    [linkedToolboxIds, toolboxes]
+  );
+  const [selectedId, setSelectedId] = useState("");
+  const validSelectedId = availableToolboxes.some((toolbox) => toolbox.id === selectedId) ? selectedId : "";
+  const hasAvailableToolboxes = availableToolboxes.length > 0;
+
+  return (
+    <div className="drawer-empty-toolbox">
+      <section className="empty nds-empty-state">
+        <p>{content.emptyText}</p>
+        <button className="nds-button" data-size="sm" data-variant="primary" type="button" onClick={() => actions.setCreateModal({ gameId })}>{content.createLabel}</button>
+      </section>
+      <section className="drawer-link-existing nds-empty-state" aria-labelledby="drawer-link-existing-title">
+        <h2 id="drawer-link-existing-title">{content.linkExistingTitle}</h2>
+        <form onSubmit={(event) => {
+          event.preventDefault();
+          if (validSelectedId) actions.linkToolboxToGame(gameId, validSelectedId);
+        }}>
+          <label className="drawer-link-existing-field">
+            <span>{content.selectLabel}</span>
+            <select className="nds-select" data-size="sm" value={validSelectedId} disabled={!hasAvailableToolboxes} onChange={(event) => setSelectedId(event.target.value)}>
+              <option value="">{hasAvailableToolboxes ? content.selectPlaceholder : content.noAvailable}</option>
+              {availableToolboxes.map((availableToolbox) => <option key={availableToolbox.id} value={availableToolbox.id}>{availableToolbox.name}</option>)}
+            </select>
+          </label>
+          <button className="nds-button" data-size="sm" data-variant="primary" type="submit" disabled={!validSelectedId}>{content.linkLabel}</button>
+        </form>
+      </section>
+    </div>
+  );
+}
+
 function EditableTitle({ value, fallback, onSave, className = "module-title", tutorialTarget = "" }) {
   const inlineEdit = useInlineEdit({
     value,

website/src/styles/_responsive.scss

@@ -429,6 +429,10 @@
     max-width: none;
   }
 
+  .drawer-link-existing form {
+    grid-template-columns: 1fr;
+  }
+
   .drawer-resize-handle {
     display: none;
   }

website/src/styles/overlays/_drawers.scss

@@ -66,6 +66,32 @@ body.is-resizing-drawer * {
   opacity: 0.56;
 }
 
+.drawer-empty-toolbox {
+  display: grid;
+  gap: var(--space-4);
+}
+
+.drawer-link-existing h2 {
+  font-size: var(--font-size-md);
+}
+
+.drawer-link-existing form {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: var(--space-3);
+  align-items: end;
+}
+
+.drawer-link-existing-field {
+  display: grid;
+  gap: var(--space-2);
+}
+
+.drawer-link-existing-field,
+.drawer-link-existing .nds-select {
+  width: 100%;
+}
+
 .drawer-close-button {
   flex: 0 0 40px;
 }