Use relative URLs where possible across all the app

Skipping API responses, where we need absolute URLs, and those that are
intended for sharing or external use:

- account/join_codes/show.html.erb - Join code URL for sharing
- boards/edit/_publication.html.erb - Publication URL for sharing
- public/* views - Public page URLs and og:url meta tags
- pwa/manifest.json.erb - PWA manifest needs absolute URLs

For this, we had to replace `url_for` used with Active Storage variants
and previews with the specific path helper (for Active Storage
representations).

app/controllers/users/avatars_controller.rb

@@ -8,7 +8,7 @@ class Users::AvatarsController < ApplicationController
     if @user.system?
       redirect_to view_context.image_path("system_user.png")
     elsif @user.avatar.attached?
-      redirect_to rails_blob_url(@user.avatar_thumbnail, disposition: "inline")
+      redirect_to rails_blob_path(@user.avatar_thumbnail, disposition: "inline")
     elsif stale? @user, cache_control: cache_control
       render_initials
     end

app/views/active_storage/blobs/web/_representation.html.erb

@@ -12,14 +12,14 @@
         height: height %>
 <% elsif blob.audio? %>
   <audio controls="true" width="100%" preload="metadata">
-    <source src="<%= rails_blob_url(blob) %>" type="<%= blob.content_type %>">
+    <source src="<%= rails_blob_path(blob) %>" type="<%= blob.content_type %>">
   </audio>
 <% elsif blob.variable? %>
-  <%= link_to url_for(blob.variant(variant)), data: { lightbox_target: "image", lightbox_caption_value: blob.filename.to_s } do %>
-    <%= image_tag url_for(blob.variant(variant)), width: width, height: height %>
+  <%= link_to rails_representation_path(blob.variant(variant)), data: { lightbox_target: "image", lightbox_caption_value: blob.filename.to_s } do %>
+    <%= image_tag rails_representation_path(blob.variant(variant)), width: width, height: height %>
   <% end %>
 <% elsif blob.previewable? %>
-  <%= image_tag url_for(blob.preview(variant)), width: width, height: height %>
+  <%= image_tag rails_representation_path(blob.preview(variant)), width: width, height: height %>
 <% else %>
   <span class="attachment__icon"><%= blob.filename.extension&.downcase.presence || "unknown" %></span>
 <% end %>

app/views/events/event/attachments/_attachment.html.erb

@@ -3,9 +3,9 @@
 <% height = attachment.metadata["height"] %>
 
 <% if attachment.previewable? %>
-  <%= image_tag url_for(attachment.preview(variant)), class: "attachment attachment--image", width: width, height: height %>
+  <%= image_tag rails_representation_path(attachment.preview(variant)), class: "attachment attachment--image", width: width, height: height %>
 <% elsif attachment.variable? %>
-  <%= image_tag url_for(attachment.variant(variant)), class: "attachment attachment--image", width: width, height: height %>
+  <%= image_tag rails_representation_path(attachment.variant(variant)), class: "attachment attachment--image", width: width, height: height %>
 <% else %>
   <div class="attachment attachment--file attachment--<%= attachment.filename.extension -%>">
     <span class="attachment__icon"><%= attachment.filename.extension&.downcase.presence || "unknown" %></span>

app/views/my/menus/_accounts.html.erb

@@ -3,7 +3,7 @@
     <%= collapsible_nav_section "Accounts" do %>
       <%# Bust cache 1 Dec 2025 %>
       <% accounts.each do |account| %>
-        <%= filter_place_menu_item landing_url(script_name: account.slug), account.name, "marker", current: account == Current.account, turbo: false %>
+        <%= filter_place_menu_item landing_path(script_name: account.slug), account.name, "marker", current: account == Current.account, turbo: false %>
       <% end %>
     <% end %>
   <% end %>

app/views/my/menus/_settings.html.erb

@@ -6,7 +6,7 @@
 
   <%= tag.li class: "popup__item", data: { filter_target: "item", navigable_list_target: "item" } do %>
     <%= icon_tag "logout", class: "popup__icon" %>
-    <%= button_to session_url(script_name: nil), method: :delete, class: "popup__btn btn", data: { turbo: false } do %>
+    <%= button_to session_path(script_name: nil), method: :delete, class: "popup__btn btn", data: { turbo: false } do %>
       <span>Sign out</span>
     <% end %>
   <% end %>

app/views/prompts/cards/_card.html.erb

@@ -3,6 +3,6 @@
     #<%= card.number %> <%= card.title %>
   </template>
   <template type="editor">
-    <%= link_to "##{card.number} #{card.title}", card_url(card) %>
+    <%= link_to "##{card.number} #{card.title}", card_path(card) %>
   </template>
 </lexxy-prompt-item>

app/views/sessions/menus/show.html.erb

@@ -13,7 +13,7 @@
         <% @accounts.each do |account| %>
           <li class="popup__item txt-medium">
             <%= icon_tag "marker", class: "popup__icon" %>
-            <%= link_to landing_url(script_name: account.slug), class: "btn overflow-ellipsis fill-transparent popup__btn" do %>
+            <%= link_to landing_path(script_name: account.slug), class: "btn overflow-ellipsis fill-transparent popup__btn" do %>
               <strong><%= account.name %></strong>
             <% end %>
           </li>

app/views/users/show.html.erb

@@ -41,7 +41,7 @@
       <% if Current.user == @user %>
         <hr class="separator--horizontal full-width flex-item-grow margin-block-start-double" style="--border-color: var(--color-ink-light);" aria-hidden="true">
 
-        <%= button_to session_url(script_name: nil), method: :delete, class: "btn txt-x-small center", data: { turbo: false } do %>
+        <%= button_to session_path(script_name: nil), method: :delete, class: "btn txt-x-small center", data: { turbo: false } do %>
           <span>Sign out of Fizzy on this device</span>
         <% end %>
       <% end %>

app/views/webhooks/event.html.erb

@@ -1,4 +1,4 @@
 <%= @event.description_for(Current.user).to_plain_text %>
 <% if @event.eventable %>
-<%= link_to "↗︎", polymorphic_url(@event.eventable) %>
+<%= link_to "↗︎", polymorphic_url(@event.eventable, only_path: true) %>
 <% end %>