fix: Resolve remaining RuboCop offenses

- Refactors the model processing line in `_prepare_setter_logic_options`
  within `lib/controller_setter_pattern/action_controller.rb` to use an
  `if` condition, resolving conflicting `Style/SafeNavigationChainLength`
  and `Lint/SafeNavigationChain` RuboCop offenses.
- Re-wraps RDoc comment lines in the same file to fix
  `Layout/LineLength` offenses.
- Applies minor auto-corrections from RuboCop after these changes.

RuboCop now reports no offenses in the codebase (aside from an
environmental warning for gemspec Ruby version).

Author: google-labs-jules[bot]

lib/controller_setter_pattern/action_controller.rb

@@ -43,7 +43,8 @@ module ClassMethods
       #
       # * +:scope+ (<tt>Symbol</tt> or <tt>Array<Symbol></tt>): One or more scopes to apply to the model
       #   or association before finding the record.
-      #   Example: <tt>set :user, scope: :active, finder_params: :email</tt> (calls <tt>User.active.find_by_email(...)</tt>)
+      #   Example: <tt>set :user, scope: :active, finder_params: :email</tt>
+      #   (calls <tt>User.active.find_by_email(...)</tt>)
       #   Example: <tt>set :article, scope: [:published, :featured]</tt>
       #
       # * Standard +before_action+ options: Options like +:only+, +:except+, +:if+, +:unless+
@@ -62,7 +63,8 @@ module ClassMethods
       #
       #   class CommentsController < ApplicationController
       #     set :post # Sets @post = Post.find(params[:post_id])
-      #     set :comment, ancestor: :post, except: [:index, :new, :create] # Sets @comment = @post.comments.find(params[:id])
+      #     set :comment, ancestor: :post, except: [:index, :new, :create]
+      #     # Sets @comment = @post.comments.find(params[:id])
       #   end
       #
       def set(*names)
@@ -103,8 +105,12 @@ def build_finder_method(params_keys)
       #   Hash: A structured options hash for internal use.
       def _prepare_setter_logic_options(custom_opts)
         normalized_finder_params = _normalize_finder_params(custom_opts.fetch(:finder_params, []))
+
+        model_class = nil
+        model_class = custom_opts[:model].to_s.camelize.constantize if custom_opts[:model]
+
         {
-          model: custom_opts[:model]&.to_s&.camelize&.constantize,
+          model: model_class,
           finder_params: normalized_finder_params,
           finder_method: build_finder_method(normalized_finder_params), # Call new helper
           ancestor: custom_opts[:ancestor],