uploads: allow changing thumbnail size on My Uploads / All Uploads pages.

* Add a "Size" menu to the My Uploads / All Uploads pages to allow
  changing the thumbnail size.
* Make the My Uploads / All Uploads pages use the same thumbnail size as
  the post index page.
* Change the "Gallery | Table" links on the My Uploads page to icons.

app/components/preview_size_menu_component/preview_size_menu_component.html.erb

@@ -0,0 +1,32 @@
+<%= render PopupMenuComponent.new(classes: "preview-size-menu") do |menu| %>
+  <% menu.button do %>
+    <span class="text-sm">Size <%= caret_down_icon %></span>
+  <% end %>
+
+  <% menu.item do %>
+    <%= link_to "Small", current_page_path(size: 150), class: ("font-bold" if current_size == 150), rel: "nofollow" %>
+  <% end %>
+
+  <% menu.item do %>
+    <%= link_to "Medium", current_page_path(size: 180), class: ("font-bold" if current_size == 180), rel: "nofollow" %>
+  <% end %>
+
+  <% menu.item do %>
+    <%= link_to "Large", current_page_path(size: 225), class: ("font-bold" if current_size == 225), rel: "nofollow" %>
+  <% end %>
+
+  <%# Mobile only %>
+  <% menu.item do %>
+    <%= link_to "Huge", current_page_path(size: 360), class: ["mobile-only", ("font-bold" if current_size == 360)], rel: "nofollow" %>
+  <% end %>
+
+  <%# Desktop only %>
+  <% menu.item do %>
+    <%= link_to "Huge", current_page_path(size: 270), class: ["desktop-only", ("font-bold" if current_size == 270)], rel: "nofollow" %>
+  <% end %>
+
+  <%# Desktop only %>
+  <% menu.item do %>
+    <%= link_to "Gigantic", current_page_path(size: 360), class: ["desktop-only", ("font-bold" if current_size == 360)], rel: "nofollow" %>
+  <% end %>
+<% end %>

app/components/preview_size_menu_component/preview_size_menu_component.js

@@ -0,0 +1 @@
+../../javascript/src/javascripts/preview_size_menu_component.js