Switch to haml.

app/assets/stylesheets/application.scss

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+// Custom bootstrap variables must be set or imported *before* bootstrap.
+@import "bootstrap";

app/views/layouts/application.html.haml

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+!!!
+%html
+  %head
+    %meta{:content => "text/html; charset=UTF-8", "http-equiv" => "Content-Type"}/
+    %title= content_for(:title) || "Pudding"
+    %meta{:content => "width=device-width,initial-scale=1", :name => "viewport"}/
+    %meta{:content => "yes", :name => "apple-mobile-web-app-capable"}/
+    %meta{:content => "yes", :name => "mobile-web-app-capable"}/
+    = csrf_meta_tags
+    = csp_meta_tag
+    = yield :head
+    %link{:href => "/icon.png", :rel => "icon", :type => "image/png"}/
+    %link{:href => "/icon.svg", :rel => "icon", :type => "image/svg+xml"}/
+    %link{:href => "/icon.png", :rel => "apple-touch-icon"}/
+    = stylesheet_link_tag :app, "data-turbo-track": "reload"
+    = javascript_importmap_tags
+    = stylesheet_link_tag "application", "data-turbo-track": "reload"
+  %body
+    = yield

app/views/layouts/mailer.html.haml

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+!!!
+%html
+  %head
+    %meta{:content => "text/html; charset=utf-8", "http-equiv" => "Content-Type"}/
+    :css
+      /* Email styles need to be inline */
+  %body
+    = yield

app/views/layouts/mailer.text.haml

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+= yield

app/views/passwords/edit.html.haml

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+%h1 Update your password
+= tag.div(flash[:alert], style: "color:red") if flash[:alert]
+= form_with url: password_path(params[:token]), method: :put do |form|
+  = form.password_field :password, required: true, autocomplete: "new-password", placeholder: "Enter new password", maxlength: 72
+  %br/
+  = form.password_field :password_confirmation, required: true, autocomplete: "new-password", placeholder: "Repeat new password", maxlength: 72
+  %br/
+  = form.submit "Save"

app/views/passwords/new.html.haml

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+%h1 Forgot your password?
+= tag.div(flash[:alert], style: "color:red") if flash[:alert]
+= form_with url: passwords_path do |form|
+  = form.email_field :email_address, required: true, autofocus: true, autocomplete: "username", placeholder: "Enter your email address", value: params[:email_address]
+  %br/
+  = form.submit "Email reset instructions"

app/views/passwords_mailer/reset.html.haml

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+%p
+  You can reset your password within the next 15 minutes on
+  \#{link_to "this password reset page", edit_password_url(@user.password_reset_token)}.

app/views/passwords_mailer/reset.text.haml

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+You can reset your password within the next 15 minutes on this password reset page:
+= edit_password_url(@user.password_reset_token)

app/views/pdfs/_form.html.haml

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+= form_with(model: pdf) do |form|
+  - if pdf.errors.any?
+    %div{:style => "color: red"}
+      %h2
+        = pluralize(pdf.errors.count, "error")
+        prohibited this pdf from being saved:
+      %ul
+        - pdf.errors.each do |error|
+          %li= error.full_message
+  %div
+    = form.label :name, style: "display: block"
+    = form.text_field :name
+  %div
+    = form.label :version, style: "display: block"
+    = form.text_field :version
+  %div
+    = form.label :description, style: "display: block"
+    = form.text_field :description
+  %div
+    = form.label :pdf_file, style: "display: block"
+    = form.file_field :pdf_file
+  %div
+    = form.label :first_page_number, style: "display: block"
+    = form.text_field :first_page_number
+  %div
+    = form.submit

app/views/pdfs/_pdf.html.haml

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+%div{:id => "#{dom_id pdf}"}
+  %p
+    %strong Name:
+    = pdf.name
+  %p
+    %strong Owner:
+    = pdf.owner_id
+  %p
+    %strong Version:
+    = pdf.version
+  %p
+    %strong Description:
+    = pdf.description
+  %p
+    %strong Page count:
+    = pdf.page_count
+  %p
+    %strong First page numberuploaded filename:
+    = pdf.first_page_numberuploaded_filename
+  %p
+    %strong Uploaded at:
+    = pdf.uploaded_at
+  %p
+    %strong Uploaded by:
+    = pdf.uploaded_by_id

app/views/pdfs/edit.html.haml

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+- content_for :title, "Editing pdf"
+%h1 Editing pdf
+= render "form", pdf: @pdf
+%br/
+%div
+  = link_to "Show this pdf", @pdf
+  |
+  \#{link_to "Back to pdfs", pdfs_path}

app/views/pdfs/index.html.haml

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+%p{:style => "color: green"}= notice
+- content_for :title, "Pdfs"
+%h1 Pdfs
+#pdfs
+  - @pdfs.each do |pdf|
+    = render pdf
+    %p
+      = link_to "Show this pdf", pdf
+= link_to "New pdf", new_pdf_path

app/views/pdfs/new.html.haml

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+- content_for :title, "New pdf"
+%h1 New pdf
+= render "form", pdf: @pdf
+%br/
+%div
+  = link_to "Back to pdfs", pdfs_path

app/views/pdfs/show.html.haml

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+%p{:style => "color: green"}= notice
+= render @pdf
+%div
+  = link_to "Edit this pdf", edit_pdf_path(@pdf)
+  |
+  \#{link_to "Back to pdfs", pdfs_path}
+
+  \#{button_to "Destroy this pdf", @pdf, method: :delete}

app/views/pwa/manifest.json.haml

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+{
+"name": "Pudding",
+"icons": [
+{
+"src": "/icon.png",
+"type": "image/png",
+"sizes": "512x512"
+},
+{
+"src": "/icon.png",
+"type": "image/png",
+"sizes": "512x512",
+"purpose": "maskable"
+}
+],
+"start_url": "/",
+"display": "standalone",
+"scope": "/",
+"description": "Pudding.",
+"theme_color": "red",
+"background_color": "red"
+}

app/views/sessions/new.html.haml

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+= tag.div(flash[:alert], style: "color:red") if flash[:alert]
+= tag.div(flash[:notice], style: "color:green") if flash[:notice]
+= form_with url: session_path do |form|
+  = form.email_field :email_address, required: true, autofocus: true, autocomplete: "username", placeholder: "Enter your email address", value: params[:email_address]
+  %br/
+  = form.password_field :password, required: true, autocomplete: "current-password", placeholder: "Enter your password", maxlength: 72
+  %br/
+  = form.submit "Sign in"
+%br/
+= link_to "Forgot password?", new_password_path

db/migrate/20241227164929_create_active_storage_tables.active_storage.rb

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+# This migration comes from active_storage (originally 20170806125915)
+class CreateActiveStorageTables < ActiveRecord::Migration[7.0]
+  def change
+    # Use Active Record's configured type for primary and foreign keys
+    primary_key_type, foreign_key_type = primary_and_foreign_key_types
+
+    create_table :active_storage_blobs, id: primary_key_type do |t|
+      t.string   :key,          null: false
+      t.string   :filename,     null: false
+      t.string   :content_type
+      t.text     :metadata
+      t.string   :service_name, null: false
+      t.bigint   :byte_size,    null: false
+      t.string   :checksum
+
+      if connection.supports_datetime_with_precision?
+        t.datetime :created_at, precision: 6, null: false
+      else
+        t.datetime :created_at, null: false
+      end
+
+      t.index [ :key ], unique: true
+    end
+
+    create_table :active_storage_attachments, id: primary_key_type do |t|
+      t.string     :name,     null: false
+      t.references :record,   null: false, polymorphic: true, index: false, type: foreign_key_type
+      t.references :blob,     null: false, type: foreign_key_type
+
+      if connection.supports_datetime_with_precision?
+        t.datetime :created_at, precision: 6, null: false
+      else
+        t.datetime :created_at, null: false
+      end
+
+      t.index [ :record_type, :record_id, :name, :blob_id ], name: :index_active_storage_attachments_uniqueness, unique: true
+      t.foreign_key :active_storage_blobs, column: :blob_id
+    end
+
+    create_table :active_storage_variant_records, id: primary_key_type do |t|
+      t.belongs_to :blob, null: false, index: false, type: foreign_key_type
+      t.string :variation_digest, null: false
+
+      t.index [ :blob_id, :variation_digest ], name: :index_active_storage_variant_records_uniqueness, unique: true
+      t.foreign_key :active_storage_blobs, column: :blob_id
+    end
+  end
+
+  private
+    def primary_and_foreign_key_types
+      config = Rails.configuration.generators
+      setting = config.options[config.orm][:primary_key_type]
+      primary_key_type = setting || :primary_key
+      foreign_key_type = setting || :bigint
+      [ primary_key_type, foreign_key_type ]
+    end
+end