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/display.rs

@@ -914,7 +914,13 @@ impl OpenCADStudio {
 
             // DATALINK <path.csv> — import a CSV file into a table placed at the
             // origin (one-time import; a live re-reading link is future work).
-            cmd if cmd == "DATALINK" || cmd.starts_with("DATALINK ") => {
+            "DATALINK" => {
+                use crate::command::ValuePromptCommand;
+                let c = ValuePromptCommand::new("DATALINK", "DATALINK  path to the .csv file:");
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("DATALINK ") => {
                 let path = cmd.trim_start_matches("DATALINK").trim();
                 if path.is_empty() {
                     self.command_line.push_info(
@@ -968,7 +974,14 @@ impl OpenCADStudio {
             // LANDXMLIMPORT <path> — import survey points (LandXML <CgPoint>
             // elements) as Point objects. Reads the coordinate text content
             // (northing easting elevation) → Point at (easting, northing, elev).
-            cmd if cmd == "LANDXMLIMPORT" || cmd.starts_with("LANDXMLIMPORT ") => {
+            "LANDXMLIMPORT" => {
+                use crate::command::ValuePromptCommand;
+                let c =
+                    ValuePromptCommand::new("LANDXMLIMPORT", "LANDXMLIMPORT  path to the .xml file:");
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("LANDXMLIMPORT ") => {
                 let path = cmd.trim_start_matches("LANDXMLIMPORT").trim();
                 if path.is_empty() {
                     self.command_line.push_info(

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) {

src/app/commands/view.rs

@@ -235,7 +235,13 @@ impl OpenCADStudio {
 
             // CUIEXPORT <path> — write the keyboard-shortcut customizations
             // (the drawing-independent CUI data) to a plain "KEY COMMAND" file.
-            cmd if cmd == "CUIEXPORT" || cmd.starts_with("CUIEXPORT ") => {
+            "CUIEXPORT" => {
+                use crate::command::ValuePromptCommand;
+                let c = ValuePromptCommand::new("CUIEXPORT", "CUIEXPORT  file to save shortcuts to:");
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("CUIEXPORT ") => {
                 let path = cmd.trim_start_matches("CUIEXPORT").trim();
                 if path.is_empty() {
                     self.command_line.push_info(
@@ -259,11 +265,13 @@ impl OpenCADStudio {
 
             // CUIIMPORT / CUILOAD <path> — load shortcut customizations from a
             // "KEY COMMAND" file (lines starting with # are ignored).
-            cmd if cmd == "CUIIMPORT"
-                || cmd == "CUILOAD"
-                || cmd.starts_with("CUIIMPORT ")
-                || cmd.starts_with("CUILOAD ") =>
-            {
+            "CUIIMPORT" | "CUILOAD" => {
+                use crate::command::ValuePromptCommand;
+                let c = ValuePromptCommand::new("CUIIMPORT", "CUIIMPORT  shortcuts file to load:");
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("CUIIMPORT ") || cmd.starts_with("CUILOAD ") => {
                 let path = cmd
                     .trim_start_matches("CUIIMPORT")
                     .trim_start_matches("CUILOAD")