feat(ai-outfit): apply approved relayout to the panel (§19.3)

- 数据源/输出 become inline label+path+browse rows (_inline_path_row);
  removed the left group boxes to free vertical space.
- 通用话术 + 最终提示词预览 enlarged and stretch with window height.
- 生成设置 grid -> 3 columns (2 rows); AI 模型 dropdown moved under it in the
  right column. Splitter sizes left360/center/right400; right minWidth 360.
- Verified offscreen against the mockup (real Qt grab); full suite (12) green.

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

src/app/widgets/ai_outfit_panel.py

@@ -162,7 +162,7 @@ class AiOutfitPanel(QWidget):
         splitter.setStretchFactor(0, 0)
         splitter.setStretchFactor(1, 1)
         splitter.setStretchFactor(2, 0)
-        splitter.setSizes([400, 600, 300])
+        splitter.setSizes([360, 540, 400])
         outer.addWidget(splitter)
 
     def _build_left(self):
@@ -171,37 +171,25 @@ class AiOutfitPanel(QWidget):
         # 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)
+        scroll.setMinimumWidth(320)
         inner = QWidget()
         col = QVBoxLayout(inner)
         col.setContentsMargins(12, 12, 12, 12)
-        col.setSpacing(12)
+        col.setSpacing(10)
 
-        # 数据源
+        # 数据源 / 输出：行内一行（标签 + 路径 + 浏览），省纵向空间给话术/预览
-        src = QGroupBox("数据源（Excel）")
-        sv = QVBoxLayout(src)
         self._excel_edit = QLineEdit()
         self._excel_edit.setPlaceholderText("选择商品表 .xlsx")
-        sv.addLayout(self._path_row(self._excel_edit, self._browse_excel))
+        col.addLayout(self._inline_path_row("Excel", self._excel_edit, self._browse_excel))
-        col.addWidget(src)
-
-        # 输出 + 模型
-        out = QGroupBox("输出")
-        ov = QVBoxLayout(out)
         self._output_edit = QLineEdit()
         self._output_edit.setPlaceholderText("默认：程序旁的「合并后的图片」")
-        ov.addLayout(self._path_row(self._output_edit, self._browse_output))
+        col.addLayout(self._inline_path_row("输出", 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)
 
-        # 通用话术
+        # 通用话术（加大，随窗口高度拉伸）
         prm = QGroupBox("通用话术")
         pv = QVBoxLayout(prm)
         self._prompt_edit = QPlainTextEdit()
-        self._prompt_edit.setFixedHeight(120)
+        self._prompt_edit.setMinimumHeight(150)
         self._prompt_edit.textChanged.connect(self._refresh_preview)
         pv.addWidget(self._prompt_edit)
         prow = QHBoxLayout()
@@ -213,9 +201,9 @@ class AiOutfitPanel(QWidget):
         save_btn.clicked.connect(self._save_prompt)
         prow.addWidget(save_btn)
         pv.addLayout(prow)
-        col.addWidget(prm)
+        col.addWidget(prm, stretch=2)
 
-        # 最终提示词预览（内嵌、实时；替换样本行的占位符）
+        # 最终提示词预览（加大；内嵌、实时；替换样本行占位符 + 附加输出要求）
         prev = QGroupBox("最终提示词预览")
         pvw = QVBoxLayout(prev)
         srow = QHBoxLayout()
@@ -231,11 +219,10 @@ class AiOutfitPanel(QWidget):
         pvw.addWidget(self._preview_warn)
         self._preview_view = QPlainTextEdit()
         self._preview_view.setReadOnly(True)
-        self._preview_view.setMinimumHeight(140)
+        self._preview_view.setMinimumHeight(200)
         pvw.addWidget(self._preview_view)
-        col.addWidget(prev)
+        col.addWidget(prev, stretch=3)
 
-        col.addStretch()
         scroll.setWidget(inner)
         return scroll
 
@@ -270,15 +257,20 @@ class AiOutfitPanel(QWidget):
         grid = QGridLayout()
         grid.setHorizontalSpacing(10)
         grid.setVerticalSpacing(8)
-        grid.setColumnStretch(0, 1)
+        for c in range(3):
-        grid.setColumnStretch(1, 1)
+            grid.setColumnStretch(c, 1)
         for i, (label, widget) in enumerate(pairs):
-            grid.addWidget(self._field(label, widget), i // 2, i % 2)
+            grid.addWidget(self._field(label, widget), i // 3, i % 3)
         gv.addLayout(grid)
+
+        # AI 模型 下拉（移到生成设置下方）
+        self._model_combo = QComboBox()
+        self._compact_combo(self._model_combo)
+        gv.addWidget(self._field("AI 模型", self._model_combo))
         return gen
 
     def _field(self, label_text, widget):
-        """A compact label-above-control cell for the 2-column settings grid."""
+        """A compact label-above-control cell for the settings grid."""
         cell = QWidget()
         v = QVBoxLayout(cell)
         v.setContentsMargins(0, 0, 0, 0)
@@ -294,8 +286,12 @@ class AiOutfitPanel(QWidget):
         combo.setMinimumContentsLength(6)
         combo.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Preferred)
 
-    def _path_row(self, line_edit, on_browse):
+    def _inline_path_row(self, label_text, line_edit, on_browse):
+        """Label + path field + 浏览 button on one row."""
         row = QHBoxLayout()
+        lbl = QLabel(label_text)
+        lbl.setFixedWidth(40)
+        row.addWidget(lbl)
         row.addWidget(line_edit, stretch=1)
         btn = QPushButton("浏览…")
         btn.clicked.connect(on_browse)
@@ -333,7 +329,7 @@ class AiOutfitPanel(QWidget):
 
     def _build_right(self):
         wrap = QWidget()
-        wrap.setMinimumWidth(300)
+        wrap.setMinimumWidth(360)
         col = QVBoxLayout(wrap)
         col.setContentsMargins(12, 12, 12, 12)
         col.setSpacing(10)