Task status model rework

Replaced categories with colors, icons and positions

db/migrate/20260404215813_replace_old_status_fields_with_new.rb

@@ -0,0 +1,11 @@
+class ReplaceOldStatusFieldsWithNew < ActiveRecord::Migration[8.1]
+  def change
+    change_table :task_statuses, bulk: true do |t|
+      t.string :icon
+      t.string :color
+      t.integer :position, default: 0
+
+      t.remove :category, type: :integer
+    end
+  end
+end