fix: Session auth, sidebar toggle, and dependencies table

- Change session.cookie_samesite from Strict to Lax for Authelia compatibility
- Redesign sidebar toggle with separate collapse/expand buttons
- Add script to create missing ticket_dependencies table
- Add .env.example template
- Add check for missing .env with helpful error message

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

views/DashboardView.php

@@ -125,12 +125,9 @@
 
     <!-- Dashboard Layout with Sidebar -->
     <div class="dashboard-layout" id="dashboardLayout">
-        <!-- Sidebar Toggle Button (outside sidebar for always-visible) -->
-        <button class="sidebar-toggle" id="sidebarToggle" onclick="toggleSidebar()" title="Toggle Sidebar">
-            <span class="toggle-arrow" id="toggleArrow">◀</span>
-        </button>
         <!-- Left Sidebar with Filters -->
         <aside class="dashboard-sidebar" id="dashboardSidebar">
+            <button class="sidebar-collapse-btn" onclick="toggleSidebar()" title="Collapse Sidebar">◀ Hide</button>
             <div class="sidebar-content">
             <div class="ascii-frame-inner">
                 <div class="ascii-subsection-header">Filters</div>
@@ -192,6 +189,8 @@
             </div>
             </div>
         </aside>
+        <!-- Expand button shown when sidebar is collapsed -->
+        <button class="sidebar-expand-btn" id="sidebarExpandBtn" onclick="toggleSidebar()" title="Show Filters">▶ Filters</button>
 
         <!-- Main Content Area -->
         <main class="dashboard-main">