Menu : Boîte à outils en premier + sidebar collapsible icônes

- Boîte à outils (/tools) en 1ère position dans la nav (desktop + mobile)
- Sidebar desktop repliable (toggle pictos-only, 14rem → 3.75rem)
  - labels masqués par transition CSS fluide (max-width + opacity)
  - état persisté en localStorage (libred-sidebar-collapsed)
- Page document : toggle Vue structurée / Aperçu document
  - sous-toggle En vigueur / Selon les votes
  - composant DocumentPreview (rendu PDF-like)
    - filigrane discret, items ordonnés par sort_order
    - mode projection : proposed_text substitu + encadrement orange
    - footer horodaté, print-friendly

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

frontend/app/stores/documents.ts

@@ -68,6 +68,8 @@ interface DocumentsState {
   current: Document | null
   items: DocumentItem[]
   versions: ItemVersion[]
+  allItemVersions: Record<string, ItemVersion[]>
+  loadingVersions: boolean
   loading: boolean
   error: string | null
 }
@@ -78,6 +80,8 @@ export const useDocumentsStore = defineStore('documents', {
     current: null,
     items: [],
     versions: [],
+    allItemVersions: {},
+    loadingVersions: false,
     loading: false,
     error: null,
   }),
@@ -247,6 +251,28 @@ export const useDocumentsStore = defineStore('documents', {
       }
     },
 
+    /**
+     * Fetch all versions for every item in a document (parallel).
+     * Used to compute the "projected" view (document as-if all active votes passed).
+     */
+    async fetchAllItemVersions(slug: string, itemIds: string[]) {
+      this.loadingVersions = true
+      try {
+        const { $api } = useApi()
+        const results = await Promise.allSettled(
+          itemIds.map(id => $api<ItemVersion[]>(`/documents/${slug}/items/${id}/versions`)),
+        )
+        const map: Record<string, ItemVersion[]> = {}
+        itemIds.forEach((id, i) => {
+          const r = results[i]
+          map[id] = r.status === 'fulfilled' ? r.value : []
+        })
+        this.allItemVersions = map
+      } finally {
+        this.loadingVersions = false
+      }
+    },
+
     /**
      * Archive a document into the Sanctuary.
      */
@@ -280,6 +306,8 @@ export const useDocumentsStore = defineStore('documents', {
       this.current = null
       this.items = []
       this.versions = []
+      this.allItemVersions = {}
+      this.loadingVersions = false
     },
   },
 })