Merge pull request #383 from KevinGriffin-new/fix/pdf-export

Never fail silently on PDF export; add EXPORTPDF <path> (#369).

The export flow handed off to an async rfd save dialog and mapped a None
result straight to Task::none(). On Linux None also means the dialog never
opened (broken XDG portal / missing zenity), and rfd reports that only via
log, so PDF export could end in total silence. The dialog-None arms now
print a message pointing at EXPORTPDF <path>, and EXPORT/EXPORTPDF take an
optional path that exports straight to a file with no dialog — the
workaround where the native dialog can't open, and a headless entry point.

Conflict: the fix (display.rs, file.rs, mod.rs, COMMANDS.md) auto-merged;
only the additive test block in automation.rs conflicted. Resolved by
keeping main's tests and adding the two #369 tests.

# Conflicts:
#	src/app/automation.rs

src/app/update/file.rs

@@ -1148,7 +1148,10 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
                 }
     }
 
-    pub(super) fn on_plot_export_path_some(&mut self, path: std::path::PathBuf) -> Task<Message> {
+    pub(in crate::app) fn on_plot_export_path_some(
+        &mut self,
+        path: std::path::PathBuf,
+    ) -> Task<Message> {
                 let i = self.active_tab;
                 let scene = &self.tabs[i].scene;
                 let wires = scene.entity_wires();
@@ -1251,10 +1254,12 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
                     &path,
                     self.active_plot_style.as_ref(),
                 ) {
-                    Ok(()) => self.command_line.push_info(&format!(
-                        "Exported: {}",
-                        path.file_name().unwrap_or_default().to_string_lossy()
-                    )),
+                    // Full path, not just the file name — when the export was
+                    // driven by EXPORTPDF <path> the user needs to see where
+                    // the file actually landed. (#369)
+                    Ok(()) => self
+                        .command_line
+                        .push_info(&format!("Exported: {}", path.display())),
                     Err(e) => self.command_line.push_error(&format!("Export failed: {e}")),
                 }
                 Task::none()

src/app/update/mod.rs

@@ -3582,7 +3582,18 @@ impl OpenCADStudio {
                     Message::PlotExportPath,
                 )
             }
-            Message::PlotExportPath(None) => Task::none(),
+            // None means the save dialog was cancelled — or never opened at
+            // all (a broken XDG portal / missing zenity on Linux resolves to
+            // None too, and rfd only reports that through `log`, which is
+            // opt-in). Either way say something instead of silently doing
+            // nothing. (#369)
+            Message::PlotExportPath(None) => {
+                self.command_line.push_info(
+                    "PDF export canceled — no file chosen. \
+                     If no dialog appeared, use EXPORTPDF <path>.",
+                );
+                Task::none()
+            }
             Message::PlotExportPath(Some(path)) => self.on_plot_export_path_some(path),
 
             Message::PlotFormat(f) => {
@@ -3606,7 +3617,14 @@ impl OpenCADStudio {
                     Message::PlotWindowExportPath,
                 )
             }
-            Message::PlotWindowExportPath(None) => Task::none(),
+            // Same silent-None trap as PlotExportPath above. (#369)
+            Message::PlotWindowExportPath(None) => {
+                self.command_line.push_info(
+                    "PDF export canceled — no file chosen. \
+                     If no dialog appeared, use EXPORTPDF <path>.",
+                );
+                Task::none()
+            }
             Message::PlotWindowExportPath(Some(path)) => self.on_plot_window_export_path_some(path),
 
             // ── Print to system printer ───────────────────────────────────────