fix(ai-outfit): stop combos from clipping the left column (§10.1)

Constrain the 样本行 and AI 模型 combos (AdjustToMinimumContentsLengthWithIcon
+ minimumContentsLength + Ignored size policy) so long items elide instead of
inflating the column's min width. Left scroll h-policy AlwaysOff -> AsNeeded as
a safety net; trim splitter initial sizes to fit the default window.

Measured: left inner minimumSizeHint 829px -> 200px (viewport ~398), no clip.

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

src/app/widgets/ai_outfit_panel.py

@@ -29,6 +29,7 @@ from PySide6.QtWidgets import (
     QProgressBar,
     QPushButton,
     QScrollArea,
+    QSizePolicy,
     QSpinBox,
     QSplitter,
     QTableWidget,
@@ -161,13 +162,15 @@ class AiOutfitPanel(QWidget):
         splitter.setStretchFactor(0, 0)
         splitter.setStretchFactor(1, 1)
         splitter.setStretchFactor(2, 0)
-        splitter.setSizes([430, 760, 300])
+        splitter.setSizes([400, 600, 300])
         outer.addWidget(splitter)
 
     def _build_left(self):
         scroll = QScrollArea()
         scroll.setWidgetResizable(True)
-        scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
+        # AsNeeded (not AlwaysOff): if a child ever exceeds the column it scrolls
+        # instead of being clipped under the center panel (docs/11 §10.1).
+        scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
         scroll.setMinimumWidth(360)
         inner = QWidget()
         col = QVBoxLayout(inner)
@@ -190,6 +193,7 @@ class AiOutfitPanel(QWidget):
         ov.addLayout(self._path_row(self._output_edit, self._browse_output))
         ov.addWidget(QLabel("AI 模型"))
         self._model_combo = QComboBox()
+        self._compact_combo(self._model_combo)
         ov.addWidget(self._model_combo)
         col.addWidget(out)
 
@@ -217,6 +221,7 @@ class AiOutfitPanel(QWidget):
         srow = QHBoxLayout()
         srow.addWidget(QLabel("样本行"))
         self._sample_combo = QComboBox()
+        self._compact_combo(self._sample_combo)
         self._sample_combo.currentIndexChanged.connect(self._refresh_preview)
         srow.addWidget(self._sample_combo, stretch=1)
         pvw.addLayout(srow)
@@ -281,6 +286,13 @@ class AiOutfitPanel(QWidget):
         v.addWidget(widget)
         return cell
 
+    def _compact_combo(self, combo):
+        """Keep a combo from dictating column width: elide long items instead of
+        expanding its minimum size hint (docs/11 §10.1)."""
+        combo.setSizeAdjustPolicy(QComboBox.AdjustToMinimumContentsLengthWithIcon)
+        combo.setMinimumContentsLength(6)
+        combo.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Preferred)
+
     def _path_row(self, line_edit, on_browse):
         row = QHBoxLayout()
         row.addWidget(line_edit, stretch=1)