feat(commands): step the selection-first text commands (bucket C)

Add SelectThenValueCommand (gather selection, then one value) and convert:
- SelectThenValueCommand: HYPERLINK (url), ARCTEXT (text), TEXTFIT (width),
  SCALETEXT (factor), TCOUNT (start), TEXTMASK (Enter to apply).
- SelectThenKeywordCommand: JUSTIFYTEXT (Left/Center/Right/Middle/Aligned/Fit),
  TCASE (Upper/Lower/Sentence/Title).

Each bare form gathers a selection when none is set, prompts, and delegates to
the inline handler. OBJECTSCALE already opens its dialog; TABLE CELL takes three
values (row/col/text) and stays typeable — TABLE bare already builds a table
interactively.

src/app/commands/display.rs

@@ -640,7 +640,18 @@ impl OpenCADStudio {
 
             // HYPERLINK <url> — attach a hyperlink to the selected objects, stored
             // in the standard PE_URL XData record so it round-trips in the file.
-            cmd if cmd == "HYPERLINK" || cmd.starts_with("HYPERLINK ") => {
+            "HYPERLINK" => {
+                use crate::command::SelectThenValueCommand;
+                let has_sel = !self.tabs[i].scene.selected_entities().is_empty();
+                let c = SelectThenValueCommand::new(
+                    "HYPERLINK",
+                    "HYPERLINK  URL to attach:",
+                    has_sel,
+                );
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("HYPERLINK ") => {
                 use acadrust::xdata::{ExtendedDataRecord, XDataValue};
                 let url = cmd.strip_prefix("HYPERLINK").unwrap_or("").trim().to_string();
                 if url.is_empty() {