feat(commands): prompt the path/file commands for their path (bucket D)

SCRIPT/SCR, DATALINK, LANDXMLIMPORT, CUIEXPORT, CUIIMPORT/CUILOAD now prompt
for the path via ValuePromptCommand instead of printing usage when run bare;
each dispatches `NAME <path>` to the existing inline handler. The path keeps
its case (dispatch does not upper-case arguments), so case-sensitive paths on
Linux/macOS still resolve. A native file dialog would be a nicer follow-up.

src/app/commands/fileops.rs

@@ -330,11 +330,13 @@ impl OpenCADStudio {
             // SCRIPT <path> — run a command script: each non-blank, non-comment
             // line is fed through the same command path the `--script` startup
             // flag uses, so the behaviour matches headless automation exactly.
-            cmd if cmd == "SCRIPT"
-                || cmd == "SCR"
-                || cmd.starts_with("SCRIPT ")
-                || cmd.starts_with("SCR ") =>
-            {
+            "SCRIPT" | "SCR" => {
+                use crate::command::ValuePromptCommand;
+                let c = ValuePromptCommand::new("SCRIPT", "SCRIPT  path to the .scr file:");
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("SCRIPT ") || cmd.starts_with("SCR ") => {
                 let path = cmd.split_once(' ').map(|(_, r)| r.trim().to_string());
                 match path {
                     Some(p) if !p.is_empty() => match std::fs::read_to_string(&p) {