docs: add @moduledoc to all LiveView modules

Add comprehensive module documentation to 12 LiveView modules covering
member, user, property, and property_type management views.

lib/mv_web/live/user_live/form.ex

@@ -1,4 +1,36 @@
 defmodule MvWeb.UserLive.Form do
+  @moduledoc """
+  LiveView form for creating and editing users.
+
+  ## Features
+  - Create new users with email
+  - Edit existing user details
+  - Optional password setting (checkbox to toggle)
+  - Link/unlink member accounts
+  - Email synchronization with linked members
+
+  ## Form Fields
+  **Required:**
+  - email
+
+  **Optional:**
+  - password (for password authentication strategy)
+  - linked member (select from existing members)
+
+  ## Password Management
+  - New users: Can optionally set password with confirmation
+  - Existing users: Can change password (no confirmation required, admin action)
+  - Checkbox toggles password section visibility
+
+  ## Member Linking
+  Users can be linked to existing member accounts. When linked, emails are
+  synchronized bidirectionally with User.email as the source of truth.
+
+  ## Events
+  - `validate` - Real-time form validation
+  - `save` - Submit form (create or update user)
+  - `toggle_password_section` - Show/hide password fields
+  """
   use MvWeb, :live_view
 
   @impl true