fix(ai-outfit): preview sample rows ignore Excel status (§19.9)

Add excel_service.read_all_rows (every valid data row, status-independent) and
use it in _reload_sample_rows for the preview dropdown, so previewing still
works after the whole sheet is 完成. Generation still uses load_outfit_tasks.
+1 excel test (read_all_rows includes 完成/失败, skips incomplete); offscreen
all-完成 sheet now yields sample rows; full suite (12) green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/widgets/ai_outfit_panel.py

@@ -636,17 +636,20 @@ class AiOutfitPanel(QWidget):
         self._refresh_preview()
 
     def _reload_sample_rows(self):
-        """Best-effort: read the chosen Excel to fill the sample dropdown."""
+        """Best-effort: read the chosen Excel to fill the sample dropdown.
+
+        Uses read_all_rows (status-independent) so preview still works after the
+        whole sheet is 完成 (docs/11 §10.3); generation still uses load_outfit_tasks.
+        """
         excel = self._excel_edit.text().strip()
-        tasks = []
+        rows = []
         if excel:
             try:
-                from services.excel_service import load_outfit_tasks
-                tasks = load_outfit_tasks(
-                    excel, retry_failed=self._retry_failed_chk.isChecked())
+                from services.excel_service import read_all_rows
+                rows = read_all_rows(excel)
             except Exception as exc:                     # noqa: BLE001 - silent for preview
                 logger.info("Sample rows unavailable: %s", exc)
-        self._fill_sample_combo(tasks)
+        self._fill_sample_combo(rows)
 
     def _refresh_preview(self):
         if not hasattr(self, "_preview_view"):

src/services/excel_service.py

@@ -113,6 +113,40 @@ def load_outfit_tasks(excel_path, retry_failed=False):
         workbook.close()
 
 
+def read_all_rows(excel_path):
+    """Return an OutfitTask for every valid data row, ignoring E-column status.
+
+    Unlike load_outfit_tasks (which filters for *processable* rows), this returns
+    all rows whose title/product/garment are filled — including 「完成」/「失败」 —
+    for preview/sample purposes only (docs/11 §10.3). Rows missing any of those
+    fields are skipped.
+    """
+    path = Path(excel_path)
+    workbook = load_workbook(str(path))
+    try:
+        sheet = workbook.worksheets[0]
+        rows = []
+        for row_index in range(2, sheet.max_row + 1):
+            title = sheet.cell(row_index, COL_TITLE).value
+            product_id = sheet.cell(row_index, COL_PRODUCT_ID).value
+            garment_path = sheet.cell(row_index, COL_GARMENT_PATH).value
+            if _is_empty(title) or _is_empty(product_id) or _is_empty(garment_path):
+                continue
+            raw_status = sheet.cell(row_index, COL_STATUS).value
+            rows.append(
+                OutfitTask(
+                    row_index=row_index,
+                    title=_cell_text(title),
+                    product_id=_cell_text(product_id),
+                    garment_path=_cell_text(garment_path),
+                    status=_cell_text(raw_status) or STATUS_PENDING,
+                )
+            )
+        return rows
+    finally:
+        workbook.close()
+
+
 def write_outfit_result(excel_path, result):
     """Write one outfit result to columns D/E/F and save immediately."""
     if not isinstance(result, OutfitResult):