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/dim.rs

@@ -56,7 +56,26 @@ impl OpenCADStudio {
 
             // JUSTIFYTEXT <option> — change the justification of selected text and
             // multiline-text objects.
-            cmd if cmd == "JUSTIFYTEXT" || cmd.starts_with("JUSTIFYTEXT ") => {
+            "JUSTIFYTEXT" => {
+                use crate::command::SelectThenKeywordCommand;
+                let has_sel = !self.tabs[i].scene.selected_entities().is_empty();
+                let c = SelectThenKeywordCommand::new(
+                    "JUSTIFYTEXT",
+                    "JUSTIFYTEXT  [Left / Center / Right / Middle / Aligned / Fit]:",
+                    vec![
+                        ("Left", "LEFT", None),
+                        ("Center", "CENTER", None),
+                        ("Right", "RIGHT", None),
+                        ("Middle", "MIDDLE", None),
+                        ("Aligned", "ALIGN", None),
+                        ("Fit", "FIT", None),
+                    ],
+                    has_sel,
+                );
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("JUSTIFYTEXT ") => {
                 let opt = cmd.split_whitespace().nth(1).unwrap_or("").to_uppercase();
                 let handles: Vec<acadrust::Handle> = self.tabs[i]
                     .scene
@@ -157,7 +176,24 @@ impl OpenCADStudio {
 
             // TCASE <Upper|Lower|Sentence|Title> — change the case of the text in
             // selected text and multiline-text objects.
-            cmd if cmd == "TCASE" || cmd.starts_with("TCASE ") => {
+            "TCASE" => {
+                use crate::command::SelectThenKeywordCommand;
+                let has_sel = !self.tabs[i].scene.selected_entities().is_empty();
+                let c = SelectThenKeywordCommand::new(
+                    "TCASE",
+                    "TCASE  [Upper / Lower / Sentence / Title]:",
+                    vec![
+                        ("Upper", "UPPER", None),
+                        ("Lower", "LOWER", None),
+                        ("Sentence", "SENTENCE", None),
+                        ("Title", "TITLE", None),
+                    ],
+                    has_sel,
+                );
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("TCASE ") => {
                 let opt = cmd.split_whitespace().nth(1).unwrap_or("").to_uppercase();
                 let handles: Vec<acadrust::Handle> = self.tabs[i]
                     .scene
@@ -226,7 +262,18 @@ impl OpenCADStudio {
             // extent and bring the text in front, so the mask hides whatever is
             // underneath while the text stays readable. (Same world-XY coordinate
             // space the WIPEOUT command uses.)
-            cmd if cmd == "TEXTMASK" || cmd.starts_with("TEXTMASK ") => {
+            "TEXTMASK" => {
+                use crate::command::SelectThenValueCommand;
+                let has_sel = !self.tabs[i].scene.selected_entities().is_empty();
+                let c = SelectThenValueCommand::new(
+                    "TEXTMASK",
+                    "TEXTMASK  press Enter to mask the selected text:",
+                    has_sel,
+                );
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("TEXTMASK ") => {
                 let handles: Vec<acadrust::Handle> = self.tabs[i]
                     .scene
                     .selected_entities()
@@ -289,7 +336,15 @@ impl OpenCADStudio {
             // (text width fit)
             // TEXTFIT <width> — adjust the width factor of selected single-line
             // text so its rendered width matches the target.
-            cmd if cmd == "TEXTFIT" || cmd.starts_with("TEXTFIT ") => {
+            "TEXTFIT" => {
+                use crate::command::SelectThenValueCommand;
+                let has_sel = !self.tabs[i].scene.selected_entities().is_empty();
+                let c =
+                    SelectThenValueCommand::new("TEXTFIT", "TEXTFIT  target width:", has_sel);
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("TEXTFIT ") => {
                 let target: f64 = match cmd.split_whitespace().nth(1).and_then(|s| s.parse().ok()) {
                     Some(v) if v > 0.0 => v,
                     _ => {
@@ -351,7 +406,18 @@ impl OpenCADStudio {
             // (text sequential numbering)
             // TCOUNT [start] — prefix selected single-line text with sequential
             // numbers in reading order (top-to-bottom, then left-to-right).
-            cmd if cmd == "TCOUNT" || cmd.starts_with("TCOUNT ") => {
+            "TCOUNT" => {
+                use crate::command::SelectThenValueCommand;
+                let has_sel = !self.tabs[i].scene.selected_entities().is_empty();
+                let c = SelectThenValueCommand::new(
+                    "TCOUNT",
+                    "TCOUNT  starting number (Enter for 1):",
+                    has_sel,
+                );
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("TCOUNT ") => {
                 let start: i64 = cmd
                     .split_whitespace()
                     .nth(1)
@@ -997,7 +1063,18 @@ impl OpenCADStudio {
 
             // ARCTEXT <text> — lay the text out as one Text entity per character
             // along the selected arc, each rotated to follow the tangent.
-            cmd if cmd == "ARCTEXT" || cmd.starts_with("ARCTEXT ") => {
+            "ARCTEXT" => {
+                use crate::command::SelectThenValueCommand;
+                let has_sel = !self.tabs[i].scene.selected_entities().is_empty();
+                let c = SelectThenValueCommand::new(
+                    "ARCTEXT",
+                    "ARCTEXT  text to place along the arc:",
+                    has_sel,
+                );
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("ARCTEXT ") => {
                 use acadrust::entities::Text;
                 use acadrust::types::Vector3;
                 let text = cmd.strip_prefix("ARCTEXT").unwrap_or("").trim().to_string();

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() {

src/app/commands/styleprops.rs

@@ -1848,7 +1848,18 @@ impl OpenCADStudio {
             // ── SCALETEXT — rescale selected Text/MText entities ─────────────────
             // Usage: SCALETEXT <factor>   e.g. SCALETEXT 2
             //        SCALETEXT H <height>  set absolute height
-            cmd if cmd == "SCALETEXT" || cmd.starts_with("SCALETEXT ") => {
+            "SCALETEXT" => {
+                use crate::command::SelectThenValueCommand;
+                let has_sel = !self.tabs[i].scene.selected_entities().is_empty();
+                let c = SelectThenValueCommand::new(
+                    "SCALETEXT",
+                    "SCALETEXT  scale factor (or 'H <height>' for an absolute height):",
+                    has_sel,
+                );
+                self.command_line.push_info(&c.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(c));
+            }
+            cmd if cmd.starts_with("SCALETEXT ") => {
                 let rest = cmd.trim_start_matches("SCALETEXT").trim();
                 let parts: Vec<&str> = rest.split_whitespace().collect();
                 let selected_handles: Vec<acadrust::Handle> = self.tabs[i]

src/command.rs

@@ -595,6 +595,84 @@ impl CadCommand for SelectThenKeywordCommand {
     }
 }
 
+/// Generic interactive front-end for a single-value command that operates on
+/// the current selection (HYPERLINK url, ARCTEXT text, TEXTFIT width, TCASE
+/// aside…). Gathers a selection first when none is set (Enter confirms), then
+/// prompts for one value and dispatches `<name> <value>` to the inline handler,
+/// which reads the still-selected set. A bare Enter on the value step dispatches
+/// `<name>` alone — for commands whose value is optional (TCOUNT, TEXTMASK).
+pub struct SelectThenValueCommand {
+    name: &'static str,
+    value_prompt: &'static str,
+    gathering: bool,
+    selected: Vec<Handle>,
+}
+
+impl SelectThenValueCommand {
+    pub fn new(name: &'static str, value_prompt: &'static str, has_selection: bool) -> Self {
+        Self {
+            name,
+            value_prompt,
+            gathering: !has_selection,
+            selected: Vec::new(),
+        }
+    }
+}
+
+impl CadCommand for SelectThenValueCommand {
+    fn name(&self) -> &'static str {
+        self.name
+    }
+
+    fn prompt(&self) -> String {
+        if self.gathering {
+            format!("{}  select objects, then press Enter:", self.name)
+        } else {
+            self.value_prompt.to_string()
+        }
+    }
+
+    fn wants_text_input(&self) -> bool {
+        !self.gathering
+    }
+
+    fn is_selection_gathering(&self) -> bool {
+        self.gathering
+    }
+
+    fn on_selection_complete(&mut self, handles: Vec<Handle>) -> CmdResult {
+        self.selected = handles;
+        CmdResult::NeedPoint
+    }
+
+    fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
+        if self.gathering {
+            return None;
+        }
+        let t = text.trim();
+        if t.is_empty() {
+            return None;
+        }
+        Some(CmdResult::Dispatch(format!("{} {t}", self.name)))
+    }
+
+    fn on_point(&mut self, _pt: DVec3) -> CmdResult {
+        CmdResult::NeedPoint
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        if self.gathering {
+            if self.selected.is_empty() {
+                return CmdResult::Cancel;
+            }
+            self.gathering = false;
+            return CmdResult::NeedPoint;
+        }
+        // Value step, nothing typed: the no-argument form (optional value).
+        CmdResult::Dispatch(format!("{} ", self.name))
+    }
+}
+
 // ── Result token ──────────────────────────────────────────────────────────
 
 /// Returned by every `CadCommand` method to tell main.rs what to do.