fix(bug-2): sidebar width via CSS attribute — bypasses @persist Alpine reactivity issue

@persist disconnects Alpine :class bindings from store reactivity on re-render.
Solution: drive sidebar width via html[data-sidebar-collapsed] CSS attribute
(same mechanism as skeleton) instead of Alpine :class.

- _syncDataset() now uses isCollapsed (respects mobile: never narrow on <768px)
- Blocking script checks window.innerWidth >= 768 before setting attribute
- Resize handler calls _syncDataset() to update attribute on viewport change
- aside gets sidebar-aside class; CSS sets 15rem/4rem at md+ via attribute

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

resources/js/bootstrap.js

@@ -70,10 +70,11 @@ document.addEventListener('alpine:init', () => {
             window.addEventListener('resize', () => {
                 this.isMobile = window.innerWidth < 768;
                 this.isCollapsed = this.collapsed && ! this.isMobile;
+                this._syncDataset();
             });
         },
         _syncDataset() {
-            if (this.collapsed) {
+            if (this.isCollapsed) {
                 document.documentElement.dataset.sidebarCollapsed = '1';
             } else {
                 delete document.documentElement.dataset.sidebarCollapsed;

resources/views/components/sidebar.blade.php

@@ -98,8 +98,7 @@
 
 <aside
     x-data="{ wsOpen: false }"
-    :class="$store.sidebar.isCollapsed ? 'w-16' : 'w-60'"
-    class="fixed inset-y-0 left-0 h-screen flex flex-col bg-s1 border-r border-white/[.06] z-40 -translate-x-full md:translate-x-0 transition-[width,transform] duration-200 ease-in-out"
+    class="sidebar-aside fixed inset-y-0 left-0 h-screen flex flex-col bg-s1 border-r border-white/[.06] z-40 -translate-x-full md:translate-x-0 transition-[width,transform] duration-200 ease-in-out"
     :style="$store.sidebar?.mobileOpen ? 'translate: 0' : null"
 >
     <!-- Header: Logo + Workspace Switcher -->

resources/views/layouts/nimuli-app.blade.php

@@ -19,7 +19,7 @@
     <script>
         (function () {
             try {
-                if (localStorage.getItem('sidebarCollapsed') === 'true') {
+                if (localStorage.getItem('sidebarCollapsed') === 'true' && window.innerWidth >= 768) {
                     document.documentElement.dataset.sidebarCollapsed = '1';
                 }
             } catch (e) {}
@@ -92,6 +92,8 @@
         @media (min-width: 768px) {
             .nim-content { margin-left: 210px; }
             html[data-sidebar-collapsed] .nim-content { margin-left: 55px; }
+            .sidebar-aside { width: 15rem; }
+            html[data-sidebar-collapsed] .sidebar-aside { width: 4rem; }
         }
         body.app-ready .app-spinner,
         body.app-ready .skel-sidebar,