fix(library): supprimer getters Alpine 3.14.9 + Private tab caché quand workspace actif

- Tous les getters (flatItems, selectedCount, allSelected, emptyIcon/Title/Text)
  remplacés par des propriétés + fonctions _recompute().
  Les getters causent un bug connu d'Alpine 3.14.9 qui bloque l'init.
- Private tab: x-show="!workspaceId && !isGiteaActive"
  (caché quand un workspace local OU distant est ouvert)

app/templates/library.html

@@ -179,7 +179,7 @@
     <button class="lib-tab" :class="{ active: tab === 'published' }" @click="switchTab('published')">
       <span class="tab-icon">🌐</span> Published
     </button>
-    <button class="lib-tab" :class="{ active: tab === 'private' }" @click="switchTab('private')" x-show="!isGiteaActive">
+    <button class="lib-tab" :class="{ active: tab === 'private' }" @click="switchTab('private')" x-show="!workspaceId && !isGiteaActive">
       <span class="tab-icon">🔒</span> Private
     </button>
     <button class="lib-tab" :class="{ active: tab === 'repository' }" @click="switchTab('repository')" x-show="isGiteaActive">
@@ -346,10 +346,8 @@ function libraryPage() {
 
     // Selection
     selected: {},
-    get selectedCount() { return Object.keys(this.selected).length; },
-    get allSelected() {
-      return this.flatItems.length > 0 && this.selectedCount === this.flatItems.length;
-    },
+    selectedCount: 0,
+    allSelected: false,
 
     // Tree
     expanded: {},
@@ -369,18 +367,21 @@ function libraryPage() {
     peekFavorited: false,
     peekMoreOpen: false,
 
-    // ── Computed flat list ──
-    get flatItems() {
+    // ── Computed flat list (NOT a getter — Alpine 3.14.9 bug) ──
+    flatItems: [],
+
+    _recomputeFlatItems() {
       var result = [];
       this._flatten(this.items, result, 0);
-      // Apply search filter
       if (this.searchQuery.trim()) {
         var q = this.searchQuery.toLowerCase();
         result = result.filter(function(r) {
           return (r.title || '').toLowerCase().indexOf(q) !== -1;
         });
       }
-      return result;
+      this.flatItems = result;
+      this.selectedCount = Object.keys(this.selected).length;
+      this.allSelected = this.flatItems.length > 0 && this.selectedCount === this.flatItems.length;
     },
 
     _flatten(nodes, out, depth) {
@@ -396,17 +397,17 @@ function libraryPage() {
     },
 
     // ── Empty states ──
-    get emptyIcon() {
+    emptyIcon: '📄',
+    emptyTitle: 'No items',
+    emptyText: '',
+
+    _recomputeEmpty() {
       var icons = {recents:'🕒',favorites:'⭐',shared:'👥',published:'🌐',private:'🔒',workspace:'📁',repository:'📦'};
-      return icons[this.tab] || '📄';
-    },
-    get emptyTitle() {
+      this.emptyIcon = icons[this.tab] || '📄';
       var titles = {recents:'No recent pages',favorites:'No favorites',shared:'No shared pages',
                     published:'No published pages',private:'No private pages',workspace:'No workspace pages',
                     repository:'Empty repository'};
-      return titles[this.tab] || 'No items';
-    },
-    get emptyText() {
+      this.emptyTitle = titles[this.tab] || 'No items';
       var texts = {recents:'Pages you\'ve recently viewed or edited will appear here.',
                    favorites:'Right-click a page in the sidebar and select "Add to Favorites".',
                    shared:'Shared pages from your team will appear here.',
@@ -414,7 +415,7 @@ function libraryPage() {
                    private:'Create a new page with the + button.',
                    workspace:'Pages inside workspaces will appear here.',
                    repository:'Repository files and pages will appear here.'};
-      return texts[this.tab] || '';
+      this.emptyText = texts[this.tab] || '';
     },
 
     // ── Init ──
@@ -430,6 +431,7 @@ function libraryPage() {
       if (t && ['recents','favorites','shared','published','private','workspace','repository'].indexOf(t) !== -1) {
         this.tab = t;
       }
+      this._recomputeEmpty();
       this.loadTab();
     },
 
@@ -439,9 +441,12 @@ function libraryPage() {
       this.tab = t;
       this.items = [];
       this.selected = {};
+      this.selectedCount = 0;
+      this.allSelected = false;
       this.expanded = {};
       this.searchQuery = '';
       this.searchOpen = false;
+      this._recomputeEmpty();
       this.updateUrl();
       this.loadTab();
     },
@@ -470,6 +475,7 @@ function libraryPage() {
         var d = await r.json();
         this.items = d.items || [];
         this._markTree(this.items, 0);
+        this._recomputeFlatItems();
       } catch(e) {
         console.error('Library load:', e);
         this.items = [];
@@ -490,7 +496,7 @@ function libraryPage() {
       }
     },
 
-    doSearch() { /* flatItems reacts to searchQuery */ },
+    doSearch() { this._recomputeFlatItems(); },
     doSort() {
       var s = this.sortBy;
       if (!s) return;
@@ -508,7 +514,7 @@ function libraryPage() {
         // Collapse
         delete this.expanded[item.id];
         this.expanded = Object.assign({}, this.expanded);
-        this.items = [...this.items]; // force reactivity
+        this._recomputeFlatItems();
         return;
       }
       // Expand — load children if not loaded yet
@@ -525,7 +531,7 @@ function libraryPage() {
           item.children = [];
         }
       }
-      this.items = [...this.items]; // force Alpine reactivity
+      this._recomputeFlatItems();
     },
 
     _markChildren(nodes, depth) {
@@ -546,6 +552,7 @@ function libraryPage() {
         this.selected[item.id] = true;
       }
       this.selected = Object.assign({}, this.selected);
+      this._recomputeFlatItems();
     },
 
     toggleSelectAll() {
@@ -558,11 +565,13 @@ function libraryPage() {
         }
         this.selected = s;
       }
+      this._recomputeFlatItems();
     },
 
     clearSelection() {
       this.selected = {};
       this.moreOpen = false;
+      this._recomputeFlatItems();
     },
 
     // ── Multi-select actions ──