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/it-IT/opencadstudio.ftl

@@ -2328,6 +2328,7 @@ common =
     .load-linetypes = Carica tipi di linea
     .requires-two-positive-values = Richiede due valori positivi (x,y) o uno per entrambi.
     .snap-marker-color = Colore del marcatore di snap
+    .command-line-text-color = Colore del testo della riga di comando
     .linetypes-loaded = __ocs_fmt_0__ tipo/i di linea caricato/i.
     .geometric-center-snap = Centro geometrico
     .no-trim-option = Non tagliare