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 <[email protected]>

src/locale_catalog.rs

@@ -4894,6 +4894,7 @@ pub(super) fn message_attribute(source: &str) -> Option<(&'static str, &'static
         "Load Linetypes" => Some(("common", "load-linetypes")),
         "Requires two positive values (x,y) or one for both." => Some(("common", "requires-two-positive-values")),
         "Snap marker color" => Some(("common", "snap-marker-color")),
+        "Command line text color" => Some(("common", "command-line-text-color")),
         "{added} linetype(s) loaded." => Some(("common", "linetypes-loaded")),
         "Geometric Center" => Some(("common", "geometric-center-snap")),
         "No trim" => Some(("common", "no-trim-option")),