Improve index tables

Stretch inputs to column width in place of fixed sizing.
Set minimum column widths for columns with form inputs.
Simplify table operations by removing `thead` and adding sentinel.
Manage empty table display with CSS only.

app/views/units/_form.html.erb

@@ -3,20 +3,17 @@
     data: {link: link, form: form_tag, hidden_row: hidden_row} do %>
 
     <td style="--depth:<%= @unit.base_id? ? 1 : 0 %>">
-      <%= form.text_field :symbol, required: true, autofocus: true, size: 12 %>
-    </td>
+      <%= form.text_field :symbol, autofocus: true, class: 'hstretch', required: true %>
     <td>
-      <%= form.text_area :description, cols: 30, rows: 1, escape: false %>
-    </td>
-    <td>
-      <%= form.number_field :multiplier, required: true if @unit.base_id? %>
-    </td>
+      <% if @unit.base_id? %>
+        <%= form.number_field :multiplier, class: 'hstretch', required: true %>
+      <% end %>
+    <td><%= form.text_area :description, class: 'hstretch', escape: false, rows: 1 %>
 
     <td class="flex">
       <%= form.button %>
       <%= image_link_to t(:cancel), "close-outline", units_path, class: 'dangerous',
         name: :cancel, onclick: render_turbo_stream('form_close', {row: row}) %>
-    </td>
-    <td></td>
+    <td>
   <% end %>
 <% end %>

app/views/units/_unit.html.erb

@@ -9,9 +9,9 @@
   <td style="--depth:<%= unit.base_id? ? 1 : 0 %>">
     <%= link_to unit, edit_unit_path(unit), class: 'link', onclick: 'this.blur();',
       data: {turbo_stream: true} %>
-  <td><%= unit.description %>
   <%# Closing <td> tag required to avoid whitespace inclusion for testing. %>
   <td class="ralign"><%= unit.multiplier.to_html if unit.base_id? %></td>
+  <td><%= unit.description %>
 
   <% if current_user.at_least(:active) %>
     <td class="flex">

app/views/units/create.turbo_stream.erb

@@ -1,4 +1,3 @@
 <%= turbo_stream.close_form dom_target(:new, @unit.base || :unit) %>
-<%= turbo_stream.remove :no_items %>
 <%= turbo_stream.replace @unit.base if @unit.base_id? %>
-<%= @before ? turbo_stream.before(@before, @unit) : turbo_stream.append(:units, @unit) %>
+<%= turbo_stream.before @before || :endmark, @unit %>

app/views/units/destroy.turbo_stream.erb

@@ -1,3 +1,2 @@
 <%= turbo_stream.replace @unit.base if @unit.base_id? %>
 <%= turbo_stream.remove @unit %>
-<%= turbo_stream.append(:units, render_no_items) if current_user.units.empty? %>

app/views/units/edit.turbo_stream.erb

@@ -3,11 +3,10 @@
           link: nil,
           form_tag: dom_target(:edit, @unit, :form)} %>
 
-<%= turbo_stream.append :unit_form do %>
+<%= turbo_stream.append_all 'body' do %>
   <%- tabular_form_with model: @unit, html: {id: ids[:form_tag]} do %>
   <% end %>
 <% end %>
 
 <%= turbo_stream.hide ids[:hidden_row] %>
-<%= turbo_stream.remove ids[:row] %>
 <%= turbo_stream.after @unit, partial: 'form', locals: ids -%>

app/views/units/index.html.erb

@@ -7,28 +7,27 @@
     class: 'tools-area' %>
 </div>
 
-<%# TODO: remove? form can be inserted directly, e.g. at the end of index %>
-<%= tag.div id: :unit_form %>
-
 <table class="main-area items-table">
-  <thead>
+  <caption class="hint"><%= t '.no_items' %></caption>
+
+  <tbody>
     <tr>
-      <th><%= Unit.human_attribute_name(:symbol) %></th>
-      <th class="hexpand"><%= Unit.human_attribute_name(:description) %></th>
-      <th><%= Unit.human_attribute_name(:multiplier) %></th>
-      <% if current_user.at_least(:active) %>
-        <th><%= t :actions %></th>
-        <th></th>
-      <% end %>
-    </tr>
-    <%= tag.tr id: "unit_", hidden: true,
-               ondragover: "dragOver(event)", ondrop: "drop(event)",
-               ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
-               data: {drop_id: "unit_", drop_id_param: "unit[base_id]"} do %>
-      <th colspan="5"><%= t '.top_level_drop' %></th>
+      <th class="hmintext"><%= Unit.human_attribute_name(:symbol) %>
+      <th class="hminnumber"><%= Unit.human_attribute_name(:multiplier) %>
+      <th class="hexpand"><%= Unit.human_attribute_name(:description) %>
+    <% if current_user.at_least(:active) %>
+      <th><%= t :actions %>
+      <th>
+
+    <tr id="unit_" hidden
+      ondragover="dragOver(event)" ondrop="drop(event)"
+      ondragenter="dragEnter(event)" ondragleave="dragLeave(event)"
+      data-drop-id="unit_" data-drop-id-param="<%= field_name(:unit, :base_id) %>">
+      <th colspan="5"><%= t '.top_level_drop' %>
     <% end %>
-  </thead>
-  <tbody id="units">
-    <%= render(@units) || render_no_items %>
-  </tbody>
+
+    <%= render @units %>
+    <%# Hidden rows with IDs allow simplier row insertion by using only
+      turbo_stream #after/#before instead of #after + #prepend/#before + #append. %>
+    <tr id="endmark" hidden>
 </table>

app/views/units/new.turbo_stream.erb

@@ -6,15 +6,10 @@
 
 <%= turbo_stream.disable ids[:link] -%>
 
-<%= turbo_stream.append :unit_form do %>
+<%= turbo_stream.append_all 'body' do %>
   <%- tabular_form_with model: @unit, html: {id: ids[:form_tag]} do |form| %>
     <%= form.hidden_field :base_id if @unit.base_id? %>
   <% end %>
 <% end %>
 
-<% if @unit.base_id? %>
-  <%= turbo_stream.remove ids[:row] %>
-  <%= turbo_stream.after @unit.base, partial: 'form', locals: ids %>
-<% else %>
-  <%= turbo_stream.prepend :units, partial: 'form', locals: ids %>
-<% end %>
+<%= turbo_stream.after @unit.base || :unit_, partial: 'form', locals: ids %>

app/views/units/rebase.turbo_stream.erb

@@ -1,4 +1,5 @@
+<% [@previous_base, @unit.base].uniq.compact.each do |unit| %>
+  <%= turbo_stream.replace unit %>
+<% end %>
 <%= turbo_stream.remove @unit %>
-<%= turbo_stream.replace @previous_base if @previous_base %>
-<%= turbo_stream.replace @unit.base if @unit.base_id? && (@previous_base&.id != @unit.base_id) %>
-<%= @before ? turbo_stream.before(@before, @unit) : turbo_stream.append(:units, @unit) %>
+<%= turbo_stream.before @before || :endmark, @unit %>