feat(ai-outfit): two settings per row in the right column

Replace the one-per-row QFormLayout with a 2-column QGridLayout (3x2:
并发/间隔 · 冷却/重试 · 分辨率/质量), matching the mockup's 2-col 生成设置.

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

src/app/widgets/ai_outfit_panel.py

@@ -16,6 +16,7 @@ from PySide6.QtWidgets import (
     QComboBox,
     QDoubleSpinBox,
     QFileDialog,
+    QGridLayout,
     QGroupBox,
     QHBoxLayout,
     QHeaderView,
@@ -234,14 +235,12 @@ class AiOutfitPanel(QWidget):
         return scroll
 
     def _create_settings_group(self):
-        """生成设置 group (lives in the right run column)."""
-        from PySide6.QtWidgets import QFormLayout
+        """生成设置 group (lives in the right run column); two params per row."""
         gen = QGroupBox("生成设置")
         gv = QVBoxLayout(gen)
         self._retry_failed_chk = QCheckBox("重试上次失败的行")
         gv.addWidget(self._retry_failed_chk)
 
-        form = QFormLayout()
         self._concurrency = QSpinBox()
         self._concurrency.setRange(1, 16)
         self._interval = QDoubleSpinBox()
@@ -256,15 +255,32 @@ class AiOutfitPanel(QWidget):
         self._resolution.addItems(_RESOLUTIONS)
         self._quality = QComboBox()
         self._quality.addItems(_QUALITIES)
-        form.addRow("并发数", self._concurrency)
-        form.addRow("新请求间隔", self._interval)
-        form.addRow("单任务冷却", self._cooldown)
-        form.addRow("失败重试", self._retry_count)
-        form.addRow("分辨率", self._resolution)
-        form.addRow("JPG 质量", self._quality)
-        gv.addLayout(form)
+
+        pairs = [
+            ("并发数", self._concurrency), ("新请求间隔", self._interval),
+            ("单任务冷却", self._cooldown), ("失败重试", self._retry_count),
+            ("分辨率", self._resolution), ("JPG 质量", self._quality),
+        ]
+        grid = QGridLayout()
+        grid.setHorizontalSpacing(10)
+        grid.setVerticalSpacing(8)
+        grid.setColumnStretch(0, 1)
+        grid.setColumnStretch(1, 1)
+        for i, (label, widget) in enumerate(pairs):
+            grid.addWidget(self._field(label, widget), i // 2, i % 2)
+        gv.addLayout(grid)
         return gen
 
+    def _field(self, label_text, widget):
+        """A compact label-above-control cell for the 2-column settings grid."""
+        cell = QWidget()
+        v = QVBoxLayout(cell)
+        v.setContentsMargins(0, 0, 0, 0)
+        v.setSpacing(2)
+        v.addWidget(QLabel(label_text))
+        v.addWidget(widget)
+        return cell
+
     def _path_row(self, line_edit, on_browse):
         row = QHBoxLayout()
         row.addWidget(line_edit, stretch=1)