tools/vterm: improve UI/UX

- Don't prompt about processes when killing buffer
- Hide modeline in vterm buffers (doesn't do anything useful and would
  be consistent with settings for eshell and term modules).
- Refactor +vterm/open & +vterm/open-popup
- Add Emacs window redraw hack to force vterm to redraw, fixing
  artefacting in some edge cases.
- Fix ansi-color-names-vector when solaire-mode is present, otherwise
  you get a mismatched background in vterm (and other terms).

modules/ui/doom/config.el

@@ -47,7 +47,11 @@
   (defun +doom|solaire-mode-swap-bg-maybe ()
     (when-let* ((rule (assq doom-theme +doom-solaire-themes)))
       (require 'solaire-mode)
-      (if (cdr rule) (solaire-mode-swap-bg))))
+      (when (cdr rule)
+        (solaire-mode-swap-bg)
+        (with-eval-after-load 'ansi-color
+          (when-let* ((color (face-background 'default)))
+            (setf (aref ansi-color-names-vector 0) color))))))
   (add-hook 'doom-load-theme-hook #'+doom|solaire-mode-swap-bg-maybe t)
   :config
   ;; fringe can become unstyled when deleting or focusing frames