Put text fill and the command-line preferences on the Display page

Three settings that work, persist, and could only be reached by typing their
name: TEXTFILL, CLIPROMPTLINES and COMMANDLINEFADETIME. The last two govern
how much of the command window is prompt and how long its history lingers —
the kind of thing people fiddle with once and then leave, which is exactly
what a settings dialog is for.

One fix rides along. TEXTFILL is a process-global, so changing it invalidates
the text in every open drawing; the SETVAR path rebuilt only the active tab,
leaving the others rendering the previous setting until an unrelated edit
happened to rebuild them. Both paths now go through
`invalidate_text_everywhere`, so the checkbox and the command cannot disagree.

Co-Authored-By: Claude Opus 5 <[email protected]>

src/app/update/file.rs

@@ -355,6 +355,17 @@ impl OpenCADStudio {
         }
     }
 
+    /// Rebuild text geometry in every open drawing.
+    ///
+    /// `TEXTFILL` is a process-global, so a change to it invalidates the text
+    /// in every tab. Doing only the active one leaves the others rendering the
+    /// previous setting until some unrelated edit happens to rebuild them.
+    pub(in crate::app) fn invalidate_text_everywhere(&mut self) {
+        for tab in &mut self.tabs {
+            tab.scene.invalidate_text_geometry_dependencies();
+        }
+    }
+
     /// Snapshot the persisted UI preferences from live state.
     pub(in crate::app) fn current_settings(&self) -> crate::app::settings::UserSettings {
         crate::app::settings::UserSettings {

src/app/update/mod.rs

@@ -6200,6 +6200,29 @@ impl OpenCADStudio {
                 Task::none()
             }
 
+            Message::TextFillChanged(filled) => {
+                crate::scene::text::sdf_atlas::set_textfill(filled);
+                self.invalidate_text_everywhere();
+                self.persist_settings_if_changed();
+                Task::none()
+            }
+
+            Message::ClipromptLinesChanged(lines) => {
+                let lines = crate::app::settings::clamp_clipromptlines(lines);
+                self.cliprompt_lines = lines;
+                self.command_line.set_cliprompt_lines(lines.clamp(0, 50) as u8);
+                self.persist_settings_if_changed();
+                Task::none()
+            }
+
+            Message::CommandLineFadeChanged(ms) => {
+                let ms = crate::app::settings::clamp_commandline_fade_ms(ms);
+                self.commandline_fade_ms = ms;
+                self.command_line.set_commandline_fade_ms(ms.max(0) as u32);
+                self.persist_settings_if_changed();
+                Task::none()
+            }
+
             Message::PickDragRectToggled(rectangle) => {
                 self.pick_drag_rect = rectangle;
                 self.persist_settings_if_changed();