style: highlight selected table and add tooltip

lib/mv_web/live/member_live/index.ex

@@ -122,6 +122,7 @@ defmodule MvWeb.MemberLive.Index do
       |> assign(:groups, groups)
       |> assign(:boolean_custom_field_filters, %{})
       |> assign(:selected_members, MapSet.new())
+      |> assign(:selected_member_id, nil)
       |> assign(:settings, settings)
       |> assign(:custom_fields_visible, custom_fields_visible)
       |> assign(:all_custom_fields, all_custom_fields)
@@ -160,6 +161,12 @@ defmodule MvWeb.MemberLive.Index do
   - `"select_all"` - Toggles selection of all visible members
   - `"sort"` - Sort event from SortHeaderComponent. Updates sort field/order and syncs URL
   """
+  @impl true
+  def handle_event("select_row_and_navigate", %{"id" => id}, socket) do
+    # Navigate to member show. Back button on show page uses ?highlight=id so returning to index shows row as selected.
+    {:noreply, push_navigate(socket, to: ~p"/members/#{id}")}
+  end
+
   @impl true
   def handle_event("select_member", %{"id" => id}, socket) do
     selected =
@@ -599,6 +606,7 @@ defmodule MvWeb.MemberLive.Index do
       |> assign(:member_fields_visible_db, visible_member_fields_db)
       |> assign(:member_fields_visible_computed, visible_member_fields_computed)
       |> assign(:visible_custom_field_ids, extract_custom_field_ids(visible_custom_fields))
+      |> assign(:selected_member_id, parse_highlight_param(params["highlight"]))
 
     next_sig = build_signature(socket)
 
@@ -798,6 +806,18 @@ defmodule MvWeb.MemberLive.Index do
     end
   end
 
+  # Parses optional "highlight" URL param (member id for selected row styling). Returns nil if missing or invalid.
+  defp parse_highlight_param(nil), do: nil
+  defp parse_highlight_param(""), do: nil
+
+  defp parse_highlight_param(id) when is_binary(id) do
+    if String.length(id) <= @max_uuid_length and match?({:ok, _}, Ecto.UUID.cast(id)),
+      do: id,
+      else: nil
+  end
+
+  defp parse_highlight_param(_), do: nil
+
   defp merge_fields_param_from_uri(params, nil), do: params
 
   defp merge_fields_param_from_uri(params, %URI{query: query}) when is_binary(query) do