Remove "save as draft"

Removes the creating status completely as well as the abandoned cards system. It will
always resume drafts if they exist, for a given collection and user.

https://app.box-car.com/5986089/cards/2489

db/migrate/20251102095019_change_cards_status_default_to_drafted.rb

@@ -0,0 +1,5 @@
+class ChangeCardsStatusDefaultToDrafted < ActiveRecord::Migration[8.2]
+  def change
+    change_column_default :cards, :status, from: "creating", to: "drafted"
+  end
+end

db/schema.rb

@@ -144,7 +144,7 @@ ActiveRecord::Schema[8.2].define(version: 2025_11_02_115338) do
     t.integer "creator_id", null: false
     t.date "due_on"
     t.datetime "last_active_at", null: false
-    t.text "status", default: "creating", null: false
+    t.text "status", default: "drafted", null: false
     t.string "title"
     t.datetime "updated_at", null: false
     t.index ["collection_id"], name: "index_cards_on_collection_id"

db/schema_cache.yml

@@ -496,7 +496,7 @@ columns:
     cast_type: *15
     sql_type_metadata: *16
     'null': false
-    default: creating
+    default: drafted
     default_function:
     collation:
     comment: