feat(plot): QUICKPRINT/QP — plot a selection's bounding box to PDF (#325)

Run QUICKPRINT (or QP), select objects, then Enter: the selection's
bounding box becomes the plot window and a PDF is written next to the
drawing (<name>_<timestamp>.pdf) using the active page setup, with no
dialog. Model space.

Implemented as a selection-gathering CadCommand (src/modules/view/
quick_print.rs) returning CmdResult::QuickPrint(handles); the host
(on_quick_print_handles) unions the picked entities' AABBs, sets the
plot window, and reuses the tested clipped window-export path.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/modules/view/mod.rs

@@ -9,6 +9,7 @@ mod ortho;
 mod pan;
 mod persp;
 pub mod plot_window;
+pub mod quick_print;
 mod properties_palette;
 mod sheetset;
 mod solid;

src/modules/view/quick_print.rs

@@ -0,0 +1,63 @@
+// QUICKPRINT / QP — run the command, select objects, then Enter to plot the
+// selection's bounding box to a PDF (handled by the host). No dialog. (#325)
+
+use crate::command::{CadCommand, CmdResult};
+use acadrust::Handle;
+use glam::DVec3;
+
+pub struct QuickPrintCommand {
+    /// Latest selection set, refreshed on every selection action.
+    handles: Vec<Handle>,
+}
+
+impl QuickPrintCommand {
+    pub fn new() -> Self {
+        Self { handles: Vec::new() }
+    }
+}
+
+impl CadCommand for QuickPrintCommand {
+    fn name(&self) -> &'static str {
+        "QUICKPRINT"
+    }
+
+    fn prompt(&self) -> String {
+        if self.handles.is_empty() {
+            "QUICKPRINT  Select objects to quick-print:".into()
+        } else {
+            format!(
+                "QUICKPRINT  {} selected — Enter to plot, or keep selecting:",
+                self.handles.len()
+            )
+        }
+    }
+
+    fn is_selection_gathering(&self) -> bool {
+        true
+    }
+
+    fn on_selection_complete(&mut self, handles: Vec<Handle>) -> CmdResult {
+        self.handles = handles;
+        CmdResult::NeedPoint
+    }
+
+    fn on_point(&mut self, _pt: DVec3) -> CmdResult {
+        CmdResult::NeedPoint
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        if self.handles.is_empty() {
+            CmdResult::Cancel
+        } else {
+            CmdResult::QuickPrint(std::mem::take(&mut self.handles))
+        }
+    }
+
+    fn on_escape(&mut self) -> CmdResult {
+        CmdResult::Cancel
+    }
+}
+
+inventory::submit!(crate::command::CommandRegistration {
+    names: &["QUICKPRINT", "QP"]
+}); // QuickPrintCommand