feat(completion): switch from selectrum to vertico

I finally resolved the lsp-mode bug I had whenever I tried vertico in
the past. It was due to me setting resize-mini-windows instead of
vertico-resize.

core/siren-core-modules.el

@@ -44,7 +44,7 @@
 (require 'siren-which-key)
 
 ;; Completion Systems and Interfaces
-(require 'siren-selectrum)
+(require 'siren-vertico)
 (require 'siren-orderless)
 
 ;; Linting

modules/editor/siren-vertico.el

@@ -8,12 +8,12 @@
 
 (use-package vertico
   :custom
-  (resize-mini-windows nil)
-  (vertico-count 12)
+  (vertico-count 16)
   (vertico-cycle t)
+  (vertico-resize nil)
 
   (enable-recursive-minibuffers t)
-  (resize-mini-windows nil)
+  (read-extended-command-predicate #'command-completion-default-include-p)
 
   :init
   (defun siren-crm-indicator (args)
@@ -23,5 +23,13 @@
   (vertico-mode +1)
   (advice-add #'completing-read-multiple :filter-args #'siren-crm-indicator))
 
+(use-package vertico-extensions
+  :straight (:type git :host github :repo "emacs-straight/vertico"
+                   :files ("extensions/*.el"))
+  :after vertico
+  :ensure nil
+  :bind
+  ("C-c C-v" . vertico-restore))
+
 (provide 'siren-vertico)
 ;;; siren-vertico.el ends here