Add holiday management functionality with CRUD operations

- Implement HolidaysController for managing holidays
- Create Holiday model with validation for recurrence types
- Add holiday form and views for creating, editing, and listing holidays
- Integrate holiday checks into customer appointment scheduling
- Update locale file for holiday-related labels and error messages
- Add migration for holidays table
- Update plugin version and add holidays to admin menu

app/views/holidays/_form.html.erb

@@ -0,0 +1,97 @@
+<%= error_messages_for 'holiday' %>
+
+<div class="box tabular">
+  <p>
+    <label for="holiday_name"><%= l(:field_name, default: 'Name') %> <span class="required">*</span></label>
+    <%= f.text_field :name, required: true, size: 40 %>
+  </p>
+
+  <p>
+    <label for="holiday_is_recurring"><%= l(:field_is_recurring, default: 'Is this a recurring holiday?') %></label>
+    <%= f.check_box :is_recurring, id: 'holiday_is_recurring' %>
+  </p>
+
+  <p id="p_recurrence_type" style="display: none;">
+    <label for="holiday_recurrence_type"><%= l(:field_recurrence_type, default: 'Recurrence Type') %></label>
+    <%= f.select :recurrence_type, 
+                 Holiday::TYPES.map { |type_key| 
+                   label_text = case type_key
+                                when 'fixed'   then l(:label_recurrence_fixed, default: 'Fixed Date (e.g., Dec 25)')
+                                when 'dynamic' then l(:label_recurrence_dynamic, default: 'Dynamic Date (e.g., 1st Monday of Sept)')
+                                else type_key.humanize
+                                end
+                   [label_text, type_key]
+                 }, 
+                 {}, 
+                 id: 'holiday_recurrence_type' %>
+  </p>
+
+  <!-- Fields for Exact Date (One-Time or Fixed Recurring) -->
+  <p id="p_exact_date">
+    <label for="holiday_exact_date"><%= l(:field_date, default: 'Date') %></label>
+    <%= f.date_field :exact_date, id: 'holiday_exact_date' %>
+  </p>
+
+  <!-- Fields for Dynamic Date -->
+  <div id="p_dynamic_date" style="display: none;">
+    <p>
+      <label><%= l(:field_dynamic_rule, default: 'Rule') %></label>
+      
+      <%= f.select :week_of_month, [
+            [l(:label_week_1st, default: '1st'), 1], 
+            [l(:label_week_2nd, default: '2nd'), 2], 
+            [l(:label_week_3rd, default: '3rd'), 3], 
+            [l(:label_week_4th, default: '4th'), 4], 
+            [l(:label_week_last, default: 'Last'), 5]
+          ], {}, style: 'width: 80px;' %>
+      
+      <%= f.select :day_of_week, 
+                   [
+                     [l(:day_name_sunday, default: 'Sunday'), 0], 
+                     [l(:day_name_monday, default: 'Monday'), 1], 
+                     [l(:day_name_tuesday, default: 'Tuesday'), 2], 
+                     [l(:day_name_wednesday, default: 'Wednesday'), 3], 
+                     [l(:day_name_thursday, default: 'Thursday'), 4], 
+                     [l(:day_name_friday, default: 'Friday'), 5], 
+                     [l(:day_name_saturday, default: 'Saturday'), 6]
+                   ], 
+                   {}, style: 'width: 120px;' %>
+      
+      <span style="margin: 0 10px;"><%= l(:label_of, default: 'of') %></span>
+      
+      <%= f.select :month, 
+                   Date::MONTHNAMES.compact.each_with_index.map { |m, i| [m, i+1] }, 
+                   {}, style: 'width: 120px;' %>
+    </p>
+  </div>
+</div>
+
+<script type="text/javascript">
+  function toggleHolidayFields() {
+    var isRecurring = $('#holiday_is_recurring').is(':checked');
+    var recurrenceType = $('#holiday_recurrence_type').val();
+
+    if (isRecurring) {
+      $('#p_recurrence_type').show();
+      if (recurrenceType === 'dynamic') {
+        $('#p_exact_date').hide();
+        $('#p_dynamic_date').show();
+      } else {
+        $('#p_exact_date').show();
+        $('#p_dynamic_date').hide();
+      }
+    } else {
+      $('#p_recurrence_type').hide();
+      $('#p_exact_date').show();
+      $('#p_dynamic_date').hide();
+    }
+  }
+
+  $(document).ready(function() {
+    toggleHolidayFields();
+
+    $('#holiday_is_recurring, #holiday_recurrence_type').on('change', function() {
+      toggleHolidayFields();
+    });
+  });
+</script>

app/views/holidays/edit.html.erb

@@ -0,0 +1,7 @@
+<h2><%= l(:label_holiday_edit, default: 'Edit Holiday') %></h2>
+
+<%= form_with model: @holiday, url: holiday_path(@holiday), method: :patch, local: true do |f| %>
+  <%= render partial: 'form', locals: { f: f } %>
+  <%= submit_tag l(:button_save) %>
+  <%= link_to l(:button_cancel), holidays_path, class: 'cancel' %>
+<% end %>

app/views/holidays/index.html.erb

@@ -0,0 +1,55 @@
+<div class="contextual">
+  <%= link_to 'New Holiday', new_holiday_path, class: 'icon icon-add' %>
+</div>
+
+<h2><%= l(:label_holiday_plural, default: 'Holidays') %></h2>
+
+<% if @holidays.any? %>
+  <div class="autoscroll">
+    <table class="list holidays">
+      <thead>
+        <tr>
+          <th><%= l(:field_name, default: 'Name') %></th>
+          <th><%= l(:field_type, default: 'Type') %></th>
+          <th><%= l(:field_date, default: 'Date / Rule') %></th>
+          <th></th>
+        </tr>
+      </thead>
+      <tbody>
+        <% @holidays.each do |holiday| %>
+          <tr class="<%= cycle('odd', 'even') %>">
+            <td class="name"><%= holiday.name %></td>
+            
+            <td class="type">
+              <% if !holiday.is_recurring %>
+                <span class="badge">One-Time</span>
+              <% else %>
+                <span class="badge" style="color: #169;">Recurring (<%= holiday.recurrence_type.capitalize %>)</span>
+              <% end %>
+            </td>
+
+            <td class="date-rule">
+              <% if !holiday.is_recurring || holiday.recurrence_type == 'fixed' %>
+                <%= holiday.exact_date&.strftime('%B %d, %Y') %>
+              <% elsif holiday.recurrence_type == 'dynamic' %>
+                <%= ['1st', '2nd', '3rd', '4th', 'Last'][holiday.week_of_month - 1] %> 
+                <%= Date::DAYNAMES[holiday.day_of_week] %> of 
+                <%= Date::MONTHNAMES[holiday.month] %>
+              <% end %>
+            </td>
+
+            <td class="buttons">
+              <%= link_to l(:button_edit), edit_holiday_path(holiday), class: 'icon icon-edit' %>
+              <%= link_to l(:button_delete), holiday_path(holiday), 
+                          method: :delete, 
+                          data: { confirm: l(:text_are_you_sure) }, 
+                          class: 'icon icon-del' %>
+            </td>
+          </tr>
+        <% end %>
+      </tbody>
+    </table>
+  </div>
+<% else %>
+  <p class="nodata"><%= l(:label_no_data) %></p>
+<% end %>

app/views/holidays/new.html.erb

@@ -0,0 +1,7 @@
+<h2><%= l(:label_holiday_new, default: 'New Holiday') %></h2>
+
+<%= form_with model: @holiday, url: holidays_path, local: true do |f| %>
+  <%= render partial: 'form', locals: { f: f } %>
+  <%= submit_tag l(:button_create) %>
+  <%= link_to l(:button_cancel), holidays_path, class: 'cancel' %>
+<% end %>