fix: navigation correctness - back buttons, exit dialog, dedup nav, redirects

- Standardize all procedural back/exit paths to /trees (not /my-trees)
- Add exit button with ConfirmDialog to procedural session top bar
- Consolidate duplicate account links in sidebar and topbar
- Auto-redirect non-owners to personal analytics
- Add toast feedback before silent permission redirects in tree editor
- Delete orphaned AdminCategoriesPage

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

frontend/src/components/layout/TopBar.tsx

@@ -1,6 +1,6 @@
 import { useState, useRef, useEffect, useCallback } from 'react'
 import { Link, useNavigate } from 'react-router-dom'
-import { Search, Zap, LogOut, User, Shield, Settings } from 'lucide-react'
+import { Search, Zap, LogOut, Shield, Settings } from 'lucide-react'
 import { useAuthStore } from '@/store/authStore'
 import { usePermissions } from '@/hooks/usePermissions'
 import { BrandLogo } from '@/components/common/BrandLogo'
@@ -122,21 +122,13 @@ export function TopBar() {
                     </span>
                   )}
                 </div>
-                <Link
-                  to="/account"
-                  onClick={() => setUserMenuOpen(false)}
-                  className="flex items-center gap-2 rounded-md px-3 py-2 text-sm text-muted-foreground hover:bg-accent hover:text-foreground"
-                >
-                  <User size={14} />
-                  Account
-                </Link>
                 <Link
                   to="/account"
                   onClick={() => setUserMenuOpen(false)}
                   className="flex items-center gap-2 rounded-md px-3 py-2 text-sm text-muted-foreground hover:bg-accent hover:text-foreground"
                 >
                   <Settings size={14} />
-                  Settings
+                  Account
                 </Link>
                 {isSuperAdmin && (
                   <Link