Add wide view and inline editing to Measurements page

The Measurements page gains a compact/wide view toggle (persisted in
localStorage). The wide view is a pivot table: rows = time points,
columns = quantity names (alphabetical), cells = value + delete button.

Clicking a value in either view opens an inline edit panel (Turbo Stream)
without leaving the page. The panel shows the quantity name, value input,
unit selector, taken_at picker, and Update/Cancel buttons.

Changes:
- MeasurementsController: add edit/update actions; order by taken_at desc
- measurements/index: compact table + wide container, view-toggle buttons
- measurements/_readout: data-* attributes for JS pivot builder; edit link
- measurements/_edit_panel, _edit_form, _edit_form_close,
  edit.turbo_stream, update.turbo_stream: inline edit views
- application.js: groupMeasurements, buildWideTable (alphabetical cols),
  getMeasurementsView / setMeasurementsView, editMeasurementWide,
  readoutUnitChanged, setDefaultUnit
- application.css: compact/wide visibility rules, .wide-cell flex layout,
  button.link reset, .items-table .form td alignment
- Pictograms: view-rows.svg, view-columns.svg (view-toggle icons)
- Locale: view_compact/view_wide toggle labels, edit link, update.success
- Tests: system tests for compact inline edit and wide view edit panel

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

app/views/measurements/_edit_form.html.erb

@@ -0,0 +1,24 @@
+<%= tabular_fields_for @readout, form: form_tag do |form| %>
+  <%- tag.tr id: row, class: "form", onkeydown: "formProcessKey(event)",
+    data: {form: form_tag, hidden_row: hidden_row, link: link} do %>
+    <td><%= @readout.quantity %></td>
+    <td class="ralign">
+      <%= form.number_field :value, required: true, autofocus: true %>
+    </td>
+    <td>
+      <%= form.collection_select :unit_id, @user_units, :id,
+        ->(u){ sanitize('&emsp;' * (u.base_id? ? 1 : 0) + u.symbol) },
+        {}, required: true %>
+    </td>
+    <td>
+      <%= form.datetime_field :taken_at %>
+    </td>
+    <td></td>
+    <td class="flex">
+      <%= form.button %>
+      <%= image_link_to t(:cancel), "close-outline", measurements_path,
+        class: 'dangerous', name: :cancel,
+        onclick: render_turbo_stream('edit_form_close', {row: row}) %>
+    </td>
+  <% end %>
+<% end %>

app/views/measurements/_edit_form_close.html.erb

@@ -0,0 +1,2 @@
+<%= turbo_stream.close_form row %>
+<%= turbo_stream.update :flashes %>

app/views/measurements/_edit_panel.html.erb

@@ -0,0 +1,33 @@
+<% form_tag = dom_id(@readout, :edit, :form) %>
+<% row = dom_id(@readout, :edit) %>
+<% hidden_row = dom_id(@readout) %>
+
+<%= tabular_form_with model: @readout, url: measurement_path(@readout),
+  id: form_tag do |form| %>
+  <table class="items-table">
+    <tbody>
+      <%= tag.tr id: row, class: "form", onkeydown: "formProcessKey(event)",
+        data: {form: form_tag, hidden_row: hidden_row} do %>
+        <td><%= @readout.quantity %></td>
+        <td class="ralign">
+          <%= form.number_field :value, required: true, autofocus: true %>
+        </td>
+        <td>
+          <%= form.collection_select :unit_id, @user_units, :id,
+            ->(u){ sanitize('&emsp;' * (u.base_id? ? 1 : 0) + u.symbol) },
+            {}, required: true %>
+        </td>
+        <td>
+          <%= form.datetime_field :taken_at %>
+        </td>
+        <td></td>
+        <td class="flex">
+          <%= form.button %>
+          <%= image_link_to t(:cancel), "close-outline", measurements_path,
+            class: 'dangerous', name: :cancel,
+            onclick: render_turbo_stream('edit_form_close', {row: row}) %>
+        </td>
+      <% end %>
+    </tbody>
+  </table>
+<% end %>

app/views/measurements/_readout.html.erb

@@ -0,0 +1,22 @@
+<%= tag.tr id: dom_id(readout), data: {taken_at: readout.taken_at&.iso8601,
+  quantity_id: readout.quantity_id, quantity_name: readout.quantity.name,
+  value: format("%.10g", readout.value), unit: readout.unit.symbol} do %>
+  <td>
+    <% if current_user.at_least(:active) %>
+      <%= link_to readout.quantity, edit_measurement_path(readout),
+        class: 'link', onclick: 'this.blur();', data: {turbo_stream: true} %>
+    <% else %>
+      <%= readout.quantity %>
+    <% end %>
+  </td>
+  <td class="ralign"><%= format("%.10g", readout.value) %></td>
+  <td><%= readout.unit %></td>
+  <td class="taken-at"><%= l(readout.taken_at) if readout.taken_at %></td>
+  <td class="created-at"><%= l(readout.created_at) %></td>
+  <% if current_user.at_least(:active) %>
+    <td class="flex">
+      <%= image_button_to t('.destroy'), 'delete-outline', measurement_path(readout),
+        method: :delete, data: {turbo_stream: true} %>
+    </td>
+  <% end %>
+<% end %>

app/views/measurements/edit.turbo_stream.erb

@@ -0,0 +1,18 @@
+<% ids = {row: dom_id(@readout, :edit),
+          hidden_row: dom_id(@readout),
+          link: nil,
+          form_tag: dom_id(@readout, :edit, :form)} %>
+
+<% if params[:view] == 'wide' %>
+  <%= turbo_stream.update :measurement_edit_form, partial: 'edit_panel' %>
+  <%= turbo_stream.hide ids[:hidden_row] %>
+<% else %>
+  <%= turbo_stream.append :measurement_edit_form do %>
+    <%- tabular_form_with model: @readout, url: measurement_path(@readout),
+      html: {id: ids[:form_tag]} do %>
+    <% end %>
+  <% end %>
+  <%= turbo_stream.hide ids[:hidden_row] %>
+  <%= turbo_stream.remove ids[:row] %>
+  <%= turbo_stream.after @readout, partial: 'edit_form', locals: ids -%>
+<% end %>

app/views/measurements/index.html.erb

@@ -5,10 +5,34 @@
       id: :new_measurement_link, onclick: 'this.blur();',
       data: {turbo_stream: true} %>
   <% end %>
+  <%= image_button_tag '', 'view-rows', name: nil, type: 'button',
+    class: 'view-toggle', title: t('.view_compact'),
+    data: {view: 'compact'}, onclick: "setMeasurementsView('compact')" %>
+  <%= image_button_tag '', 'view-columns', name: nil, type: 'button',
+    class: 'view-toggle', title: t('.view_wide'),
+    data: {view: 'wide'}, onclick: "setMeasurementsView('wide')" %>
+</div>
+
+<div class="main-area measurements-section">
+  <%= tag.div id: :measurement_edit_form %>
+  <table class="items-table measurements-compact">
+    <thead>
+      <tr>
+        <th><%= Quantity.model_name.human %></th>
+        <th><%= Readout.human_attribute_name(:value) %></th>
+        <th><%= Unit.model_name.human %></th>
+        <th><%= Readout.human_attribute_name(:taken_at) %></th>
+        <th><%= Readout.human_attribute_name(:created_at) %></th>
+        <% if current_user.at_least(:active) %>
+          <th></th>
+        <% end %>
+      </tr>
+    </thead>
+    <tbody id="measurements">
+      <%= render(partial: 'readout', collection: @measurements, as: :readout) || render_no_items %>
+    </tbody>
+  </table>
+
+  <div id="measurements-wide" class="measurements-wide"></div>
 </div>
 
-<table class="main-area">
-  <tbody id="measurements">
-    <%= render(@measurements) || render_no_items %>
-  </tbody>
-</table>

app/views/measurements/update.turbo_stream.erb

@@ -0,0 +1,2 @@
+<%= turbo_stream.close_form dom_id(@readout, :edit) %>
+<%= turbo_stream.replace @readout, partial: 'measurements/readout', locals: {readout: @readout} %>