feat(nav): partial HTMX navigation — swap main content without full reload

Intercept internal links and load only .main-wrapper via htmx.ajax, keeping the sidebar/header shell in place. Adds history pushState/popstate handling, sidebar active-state resync and document title update. Moves page script blocks inside #main-content so they run on swap, and makes editor/board scripts idempotent. Routes navigateTo/breadcrumb/library/local-workspace through window.fdNavigate and fixes the duplicated navigateTo definition.

app/templates/base.html

@@ -211,7 +211,7 @@
       <div class="um-sep"></div>
       <div class="um-version">FlowDeck v{{ app_version }}</div>
       <div class="um-sep"></div>
-      <a href="/auth/logout" class="um-item um-danger" @click="workspaceMenuOpen=false">{{ fd_icon("log-out", 16) }} Log out</a>
+      <a href="/auth/logout" class="um-item um-danger" hx-boost="false" @click="workspaceMenuOpen=false">{{ fd_icon("log-out", 16) }} Log out</a>
     </div>
     </div>
 
@@ -265,7 +265,7 @@
           {% else %}
           <li class="sidebar-item empty-hint"><span class="page-icon page-icon-svg">{{ fd_icon("folder",16) }}</span><span class="page-name text-dim">Open a workspace to see your files</span></li>
           {% endif %}
-          <li class="sidebar-item" style="margin-top:4px;border-top:1px solid var(--border);padding-top:8px;" onclick="window.location='/workspaces'">
+          <li class="sidebar-item" style="margin-top:4px;border-top:1px solid var(--border);padding-top:8px;" onclick="window.fdNavigate ? window.fdNavigate('/workspaces') : window.location='/workspaces'">
             <span class="page-icon page-icon-svg">{{ fd_icon("settings",16) }}</span><span class="page-name text-dim">Manage Workspaces</span>
           </li>
         </ul>
@@ -598,6 +598,7 @@
     <!-- Content -->
     <div class="content-area" id="main-content">
       {% block content %}{% endblock %}
+      {% block scripts %}{% endblock %}
     </div>
 
   </div>
@@ -1255,11 +1256,6 @@
       toggleWorkspaceMenu() {
         this.workspaceMenuOpen = !this.workspaceMenuOpen;
       },
-      navigateTo(url) {
-        this.mobileSidebarOpen = false;
-        this.sidebarCollapsed = true;
-        window.location.href = url;
-      },
       openQuickFind() { if (window.FlowDeckPalette) window.FlowDeckPalette.open(); },
 
       // ── Tree state ──
@@ -1328,12 +1324,15 @@
       },
 
       navigateTo(url) {
+        this.mobileSidebarOpen = false;
+        this.sidebarCollapsed = true;
         // Preserve workspace context when navigating to library/trash
         if ((url === '/library' || url === '/trash') && this.workspaceKey && this.workspaceKey.includes('/')) {
           const parts = this.workspaceKey.split('/');
           url = `${url}?owner=${parts[0]}&repo=${parts.slice(1).join('/')}`;
         }
-        window.location.href = url;
+        if (window.fdNavigate) window.fdNavigate(url);
+        else window.location.href = url;
       },
 
       showContextMenu(event, pageId, pageName) {
@@ -1669,7 +1668,8 @@
           .catch(err => { this.toast('Failed: ' + err.message, 'error'); });
       },
       openWorkspacePage(pageId) {
-        window.location = `/pages/${pageId}`;
+        if (window.fdNavigate) window.fdNavigate('/pages/' + pageId);
+        else window.location = `/pages/${pageId}`;
       },
 
       // ── Tree expand/collapse + folder navigation ──
@@ -1689,7 +1689,8 @@
           localStorage.setItem('fd_expanded_folders', JSON.stringify(this.expandedFolders));
           localStorage.setItem('fd_sections', JSON.stringify(this.sectionsOpen));
         } catch(e) {}
-        window.location = `/local-workspace?folder=${id}`;
+        if (window.fdNavigate) window.fdNavigate(`/local-workspace?folder=${id}`);
+        else window.location = `/local-workspace?folder=${id}`;
       },
 
       createEmptyPage() {
@@ -1841,8 +1842,7 @@
     }
   });
 </script>
-<script src="/static/js/app.js?v=2.4.6" defer></script>
-{% block scripts %}{% endblock %}
+<script src="/static/js/app.js?v=2.4.7" defer></script>
 
 <style>
 .flowdeck-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.6);z-index:2000;display:flex;align-items:center;justify-content:center;}
@@ -2034,7 +2034,7 @@
   function choose(i){
     var it = state.items[i]; if(!it) return;
     if(it.run){ var ok = it.run(); if(ok) close(); return; }
-    if(it.url){ window.location.href=it.url; close(); return; }
+    if(it.url){ if(window.fdNavigate) window.fdNavigate(it.url); else window.location.href=it.url; close(); return; }
   }
 
   function onKey(e){