feat(options): command line text colour and a fonts folder

Display gets a command line text colour (blank keeps the theme's); it
covers history, prompts and the input, while errors stay red. Files
lists the fonts folder that text resolution searches, so .shx files can
be added by hand; opening it creates it first.

Discussions #1493, #1372

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

locales/es-ES/opencadstudio.ftl

@@ -2329,6 +2329,7 @@ common =
     .load-linetypes = Cargar tipos de línea
     .requires-two-positive-values = Requiere dos valores positivos (x,y) o uno para ambos.
     .snap-marker-color = Color del marcador de referencia
+    .command-line-text-color = Color del texto de la línea de comandos
     .linetypes-loaded = __ocs_fmt_0__ tipo(s) de línea cargado(s).
     .geometric-center-snap = Centro geométrico
     .no-trim-option = No recortar