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 <noreply@anthropic.com>

src/app/commands/styleprops.rs

@@ -2184,9 +2184,7 @@ impl OpenCADStudio {
                     // TEXTFILL reset the glyph atlas; re-tessellate so text picks
                     // up the re-baked filled / hollow tiles.
                     if name == "TEXTFILL" {
-                        self.tabs[i]
-                            .scene
-                            .invalidate_text_geometry_dependencies();
+                        self.invalidate_text_everywhere();
                     }
                     // LTSCALE scales the dash pattern baked into every wire, and
                     // PDMODE / PDSIZE decide the point glyph built at tessellation