Add appeals (#17364)

* Add appeals

* Add ability to reject appeals and ability to browse pending appeals in admin UI

* Add strikes to account page in settings

* Various fixes and improvements

- Add separate notification setting for appeals, separate from reports
- Fix style of links in report/strike header
- Change approving an appeal to not restore statuses (due to federation complexities)
- Change style of successfully appealed strikes on account settings page
- Change account settings page to only show unappealed or recently appealed strikes

* Change appealed_at to overruled_at

* Fix missing method error

app/controllers/admin/disputes/appeals_controller.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+class Admin::Disputes::AppealsController < Admin::BaseController
+  before_action :set_appeal, except: :index
+
+  def index
+    authorize :appeal, :index?
+
+    @appeals = filtered_appeals.page(params[:page])
+  end
+
+  def approve
+    authorize @appeal, :approve?
+    log_action :approve, @appeal
+    ApproveAppealService.new.call(@appeal, current_account)
+    redirect_to disputes_strike_path(@appeal.strike)
+  end
+
+  def reject
+    authorize @appeal, :approve?
+    log_action :reject, @appeal
+    @appeal.reject!(current_account)
+    UserMailer.appeal_rejected(@appeal.account.user, @appeal)
+    redirect_to disputes_strike_path(@appeal.strike)
+  end
+
+  private
+
+  def filtered_appeals
+    Admin::AppealFilter.new(filter_params.with_defaults(status: 'pending')).results.includes(strike: :account)
+  end
+
+  def filter_params
+    params.slice(:page, *Admin::AppealFilter::KEYS).permit(:page, *Admin::AppealFilter::KEYS)
+  end
+
+  def set_appeal
+    @appeal = Appeal.find(params[:id])
+  end
+end