feat: implement fine-tune state and complete inter-panel signal wiring

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

src/app/widgets/queue_panel.py

@@ -279,6 +279,16 @@ class QueuePanel(QWidget):
     def set_export_options(self, options: ExportOptions):
         self._export_options = options
 
+    def mark_item_fine_tuned(self, item: "QueueItem", state: TransformState):
+        """Save a per-item transform and mark it as fine-tuned in the table."""
+        try:
+            row = self._model._items.index(item)
+        except ValueError:
+            return
+        item.transform = state
+        item.param_source = "已微调"
+        self._model.update_row(row)
+
     # ── internal slots ───────────────────────────────────────────────────────
 
     def _rebuild_queue(self):