Add preview output list and confirmation before writing

.github/copilot-tasks.md

@@ -81,10 +81,10 @@ Projekt vollstaendig umsetzen: aus PS_PW.xlsx und Stellenbeschreibungen.xlsx mon
 	- [x] Parameter `--month` und `--year`
 	- [x] Pipeline orchestrieren: parse -> match -> validate -> preview -> write
 	- [x] Kontrollierter Exit-Code bei Fehlern
-- [ ] T14: Vorschau + Bestaetigung vor Schreiben
+- [x] T14: Vorschau + Bestaetigung vor Schreiben
-	- [ ] Uebersicht zu Berichtsmonat, aktiven Faellen, Fehlern
+	- [x] Uebersicht zu Berichtsmonat, aktiven Faellen, Fehlern
-	- [ ] Liste der geplanten Ausgabedateien
+	- [x] Liste der geplanten Ausgabedateien
-	- [ ] Interaktive Bestaetigung (Abbruch ohne Schreibzugriff moeglich)
+	- [x] Interaktive Bestaetigung (Abbruch ohne Schreibzugriff moeglich)
 
 ## Phase 8 - Tests und Abnahme
 - [ ] T15: Smoke-Test fuer End-to-End-Lauf
@@ -111,4 +111,4 @@ Projekt vollstaendig umsetzen: aus PS_PW.xlsx und Stellenbeschreibungen.xlsx mon
 8. T15 -> T16 -> T17
 
 ## Aktueller Startpunkt
-- [ ] Naechste aktive Aufgabe: T14 (Vorschau + Bestaetigung vor Schreiben)
+- [ ] Naechste aktive Aufgabe: T15 (Smoke-Test fuer End-to-End-Lauf)

generate.py

@@ -10,7 +10,11 @@ from src.taetigkeitsnachweis.logging_utils import configure_logging
 from src.taetigkeitsnachweis.matcher import match_assignments
 from src.taetigkeitsnachweis.parser import parse_allocation_records, parse_masterdata_records
 from src.taetigkeitsnachweis.validator import validate_business_rules, validate_sources
-from src.taetigkeitsnachweis.writer import build_employee_workbooks, save_employee_workbooks
+from src.taetigkeitsnachweis.writer import (
+    build_employee_workbooks,
+    build_output_filename,
+    save_employee_workbooks,
+)
 
 
 def _load_config(project_root: Path) -> dict:
@@ -27,7 +31,7 @@ def _print_issues(issues: list, title: str) -> None:
         click.echo(f"- [{issue.severity}] {issue.code}: {issue.message}")
 
 
-def _print_preview(month: int, year: int, matched_assignments: list) -> None:
+def _print_preview(month: int, year: int, matched_assignments: list, planned_files: list[str]) -> None:
     click.echo("=== Vorschau der ermittelten Werte ===")
     click.echo(f"Berichtsmonat : {month:02d}/{year}")
     click.echo(f"Aktive Faelle : {len(matched_assignments)}")
@@ -40,11 +44,16 @@ def _print_preview(month: int, year: int, matched_assignments: list) -> None:
             f"{item.foerderquote_percent:.2f}%"
         )
 
+    click.echo("--- Geplante Ausgabedateien ---")
+    for file_name in planned_files:
+        click.echo(f"- {file_name}")
+
 
 @click.command()
 @click.option("--month", type=click.IntRange(1, 12), required=True)
 @click.option("--year", type=click.IntRange(2000, 2100), required=True)
-def main(month: int, year: int) -> None:
+@click.option("--yes", is_flag=True, default=False, help="Skip interactive confirmation.")
+def main(month: int, year: int, yes: bool) -> None:
     configure_logging()
     project_root = Path(__file__).resolve().parent
 
@@ -93,7 +102,30 @@ def main(month: int, year: int) -> None:
         if any(issue.severity == "error" for issue in all_issues):
             raise click.ClickException("Validation failed after matching.")
 
-        _print_preview(month=month, year=year, matched_assignments=matched_assignments)
+        filename_pattern = config["output"]["filename_pattern"]
+        unique_employees = sorted({item.allocation.employee_name for item in matched_assignments})
+        planned_files = [
+            build_output_filename(
+                filename_pattern=filename_pattern,
+                employee_name=employee_name,
+                report_year=year,
+                report_month=month,
+            )
+            for employee_name in unique_employees
+        ]
+
+        _print_preview(
+            month=month,
+            year=year,
+            matched_assignments=matched_assignments,
+            planned_files=planned_files,
+        )
+
+        if not yes:
+            confirmed = click.confirm("Dateien jetzt schreiben?", default=False)
+            if not confirmed:
+                click.echo("Abbruch ohne Schreibzugriff.")
+                return
 
         employee_workbooks = build_employee_workbooks(
             config=config,