Feat: Projektweite XSLT-Parameter mit Vererbungshierarchie (v1.4.0)

Ermöglicht die Definition von XSLT-Parametern auf Projektebene, die als
Basis für alle Transformationen dienen und von TreeNode- bzw. XslFile-
Parametern überschrieben werden können (Projekt < TreeNode < XslFile).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/ui/AppSettings.py

@@ -391,6 +391,7 @@ class AppSettingsDlg(QDialog):
                 xsl_dir_id=project_data["xsl_dir_id"] if project_data["xsl_dir_id"] != -1 else 1,
                 postgre_sql_db_id=project_data["postgre_sql_db_id"] if project_data["postgre_sql_db_id"] != -1 else 1,
                 fop_config_dir=Path(project_data["fop_config_dir"]) if project_data.get("fop_config_dir") else None,
+                xslt_params=project_data.get("xslt_params", {}),
             )
             self.temp_pdf_projects.append(new_project)
             self._populate_pdf_project_table()
@@ -422,6 +423,7 @@ class AppSettingsDlg(QDialog):
                 "xsl_dir_id": pdf_project.xsl_dir_id,
                 "postgre_sql_db_id": pdf_project.postgre_sql_db_id,
                 "fop_config_dir": str(pdf_project.fop_config_dir) if pdf_project.fop_config_dir else None,
+                "xslt_params": dict(pdf_project.xslt_params),
             }
             dialog = PdfProjectDlg(self, project_data, edit_mode=True)
             if dialog.exec() == PdfProjectDlg.DialogCode.Accepted:
@@ -450,6 +452,7 @@ class AppSettingsDlg(QDialog):
                 pdf_project.fop_config_dir = (
                     Path(new_data["fop_config_dir"]) if new_data.get("fop_config_dir") else None
                 )
+                pdf_project.xslt_params = new_data.get("xslt_params", {})
                 self._populate_pdf_project_table()
                 self.settings.pdf_projects = self.temp_pdf_projects.copy()
                 self.settings.save()