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/app/mod.rs

@@ -592,6 +592,10 @@ pub(super) struct OpenCADStudio {
     crosshair_color_input: String,
     /// Explicit object-snap marker colour; `None` keeps the automatic one.
     snap_marker_color: Option<[u8; 3]>,
+    /// Explicit command-line text colour; `None` keeps the theme's.
+    command_text_color: Option<[u8; 3]>,
+    /// Editable Options buffer for the command-line text colour.
+    command_text_color_input: String,
     /// Editable Options buffer for the snap marker colour.
     snap_marker_color_input: String,
     /// Defer the ISOLINES mesh rebuild until the slider is released.
@@ -2296,6 +2300,7 @@ pub enum Message {
     /// Edit the optional crosshair RGB value; blank restores automatic contrast.
     CrosshairColorChanged(String),
     SnapMarkerColorChanged(String),
+    CommandTextColorChanged(String),
     /// Options → Files: the default template for new drawings.
     QnewTemplateChanged(String),
     QnewTemplateBrowse,
@@ -4167,6 +4172,8 @@ impl OpenCADStudio {
             crosshair_color_input: String::new(),
             snap_marker_color: None,
             snap_marker_color_input: String::new(),
+            command_text_color: None,
+            command_text_color_input: String::new(),
             isolines_awaiting_regen: false,
             snap_angle_input: "0".to_string(),
             lineweight_display_scale: 100,

src/app/settings.rs

@@ -432,6 +432,8 @@ pub struct UserSettings {
     pub crosshair_color: Option<[u8; 3]>,
     /// Explicit object-snap marker RGB. `None` keeps the automatic colour.
     pub snap_marker_color: Option<[u8; 3]>,
+    /// Explicit command-line text RGB. `None` keeps the theme's.
+    pub command_text_color: Option<[u8; 3]>,
     /// Model-space lineweight preview scale as a percentage.
     pub lineweight_display_scale: i32,
     /// Isometric drafting changes the grid and crosshair to the active axis
@@ -825,6 +827,7 @@ impl Default for UserSettings {
             cursor_type: CursorType::Crosshair,
             crosshair_color: None,
             snap_marker_color: None,
+            command_text_color: None,
             lineweight_display_scale: 100,
             isometric_drafting: false,
             iso_plane: IsoPlane::Left,

src/app/update/file.rs

@@ -682,6 +682,7 @@ impl OpenCADStudio {
             cursor_type: self.cursor_type,
             crosshair_color: self.crosshair_color,
             snap_marker_color: self.snap_marker_color,
+            command_text_color: self.command_text_color,
             lineweight_display_scale: self.lineweight_display_scale,
             isometric_drafting: self.isometric_drafting,
             iso_plane: self.iso_plane,
@@ -798,6 +799,12 @@ impl OpenCADStudio {
             .snap_marker_color
             .map(crate::app::config::rgb_to_hex)
             .unwrap_or_default();
+        self.command_text_color = s.command_text_color;
+        self.command_text_color_input = s
+            .command_text_color
+            .map(crate::app::config::rgb_to_hex)
+            .unwrap_or_default();
+        crate::ui::command_line::set_text_color(s.command_text_color);
         self.lineweight_display_scale = s.lineweight_display_scale.clamp(25, 200);
         self.isometric_drafting = s.isometric_drafting;
         self.iso_plane = s.iso_plane;

src/app/update/mod.rs

@@ -8060,6 +8060,20 @@ impl OpenCADStudio {
                     None => Message::Noop,
                 },
             ),
+            Message::CommandTextColorChanged(value) => {
+                self.command_text_color_input = value.clone();
+                let color = if value.trim().is_empty() {
+                    None
+                } else if let Some(rgb) = crate::app::config::parse_hex(&value) {
+                    Some(rgb)
+                } else {
+                    return Task::none();
+                };
+                self.command_text_color = color;
+                crate::ui::command_line::set_text_color(color);
+                self.persist_settings_if_changed();
+                Task::none()
+            }
             Message::SnapMarkerColorChanged(value) => {
                 self.snap_marker_color_input = value.clone();
                 if value.trim().is_empty() {
@@ -8532,7 +8546,11 @@ impl OpenCADStudio {
                 Task::none()
             }
 
-            Message::OpenFolder(path) => crate::sys::open_url(&path, None),
+            Message::OpenFolder(path) => {
+                // The fonts folder exists only once something is put in it.
+                let _ = std::fs::create_dir_all(&path);
+                crate::sys::open_url(&path, None)
+            }
 
             Message::PickDragRectToggled(rectangle) => {
                 self.pick_drag_rect = rectangle;

src/app/view/modal.rs

@@ -376,6 +376,8 @@ impl OpenCADStudio {
                                         .map(|p| p.display().to_string()),
                                     autosave: crate::config::config_dir()
                                         .map(|_| std::env::temp_dir().display().to_string()),
+                                    fonts: crate::io::font_repo::fonts_dir()
+                                        .map(|p| p.display().to_string()),
                                 }
                             }
                             #[cfg(target_arch = "wasm32")]
@@ -391,6 +393,8 @@ impl OpenCADStudio {
                         &self.crosshair_color_input,
                         self.snap_marker_color,
                         &self.snap_marker_color_input,
+                        self.command_text_color,
+                        &self.command_text_color_input,
                         self.lineweight_display_scale,
                         &self.model_space,
                         &self.model_bg_input,