Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `.prettierignore`:
  Upstream added a line at the end, glitch-soc had extra entries at the end.
  Added upstream's new line before glitch-soc's.
- `Gemfile.lock`:
  Upstream updated dependencies while glitch-soc has an extra one (hcaptcha).
  Updated dependencies like upstream did.
- `app/controllers/api/v1/statuses_controller.rb`:
  Not a real conflict, upstream added a parameter (`allowed_mentions`) where
  glitch-soc already had an extra one (`content_type`).
  Added upstream's new parameter.
- `app/javascript/styles/fonts/roboto-mono.scss`:
  A lot of lines were changed upstream due to code style changes, and a lot
  of those lines had path changes to accomodate glitch-soc's theming system.
  Applied upstream's style changes.
- `app/javascript/styles/fonts/roboto.scss`:
  A lot of lines were changed upstream due to code style changes, and a lot
  of those lines had path changes to accomodate glitch-soc's theming system.
  Applied upstream's style changes.

app/controllers/api/v1/statuses_controller.rb

@@ -64,11 +64,18 @@ class Api::V1::StatusesController < Api::BaseController
       application: doorkeeper_token.application,
       poll: status_params[:poll],
       content_type: status_params[:content_type],
+      allowed_mentions: status_params[:allowed_mentions],
       idempotency: request.headers['Idempotency-Key'],
       with_rate_limit: true
     )
 
     render json: @status, serializer: @status.is_a?(ScheduledStatus) ? REST::ScheduledStatusSerializer : REST::StatusSerializer
+  rescue PostStatusService::UnexpectedMentionsError => e
+    unexpected_accounts = ActiveModel::Serializer::CollectionSerializer.new(
+      e.accounts,
+      serializer: REST::AccountSerializer
+    )
+    render json: { error: e.message, unexpected_accounts: unexpected_accounts }, status: 422
   end
 
   def update
@@ -131,6 +138,7 @@ class Api::V1::StatusesController < Api::BaseController
       :language,
       :scheduled_at,
       :content_type,
+      allowed_mentions: [],
       media_ids: [],
       media_attributes: [
         :id,