Sprint 5: User profile menu, preferences, org member management, v0.2.0

- Move Settings from sidebar Admin section to User Profile dropdown menu
- Add User Preferences page (placeholder for future: dark mode, timezone,
  notifications, feature visibility)
- Add Manage Members page for tenant admins to invite/manage board members:
  - List all org members with roles, status, join date, last login
  - Add new members (creates user account + org membership)
  - Change member roles (president, treasurer, secretary, board member,
    property manager, viewer)
  - Remove members (soft-deactivate)
  - Role-gated: only president, admin, treasurer can manage members
- Backend: new org member management endpoints on OrganizationsController
  - GET /organizations/members
  - POST /organizations/members
  - PUT /organizations/members/:id/role
  - DELETE /organizations/members/:id
- Bump version to 0.2.0 MVP_P2 (package.json + Settings page)

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

frontend/src/components/layout/Sidebar.tsx

@@ -12,7 +12,6 @@ import {
   IconShieldCheck,
   IconBuildingBank,
   IconUsers,
-  IconSettings,
   IconCrown,
   IconCategory,
   IconChartAreaLine,
@@ -74,12 +73,6 @@ const navSections = [
       },
     ],
   },
-  {
-    label: 'Admin',
-    items: [
-      { label: 'Settings', icon: IconSettings, path: '/settings' },
-    ],
-  },
 ];
 
 export function Sidebar() {