Let table cells manage widget sizes naturally

- Remove fixed heights, let Qt size widgets to fit cells
- Increase row height to 40px for more room
- Use padding instead of fixed size on remove button

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/cmdforge/gui/dialogs/test_step_dialog.py

@@ -299,27 +299,24 @@ class TestStepDialog(QDialog):
         self.assertions_table.insertRow(row)
 
         # Set proper row height for widgets
-        self.assertions_table.setRowHeight(row, 32)
+        self.assertions_table.setRowHeight(row, 40)
 
         # Type dropdown
         type_combo = QComboBox()
-        type_combo.setFixedHeight(26)
         type_combo.setMinimumWidth(120)
+        self.assertions_table.setCellWidget(row, 0, type_combo)
         for type_id, display_name, tooltip in self.ASSERTION_TYPES:
             type_combo.addItem(display_name, type_id)
             idx = type_combo.count() - 1
             type_combo.setItemData(idx, tooltip, Qt.ToolTipRole)
-        self.assertions_table.setCellWidget(row, 0, type_combo)
 
         # Value input
         value_edit = QLineEdit()
         value_edit.setPlaceholderText("Expected value (if applicable)")
-        value_edit.setFixedHeight(26)
         self.assertions_table.setCellWidget(row, 1, value_edit)
 
         # Remove button - red X for clear delete action
         btn_remove = QPushButton("✕")
-        btn_remove.setFixedSize(26, 26)
         btn_remove.setToolTip("Remove this assertion")
         btn_remove.setStyleSheet("""
             QPushButton {
@@ -328,7 +325,8 @@ class TestStepDialog(QDialog):
                 border: 1px solid #fc8181;
                 border-radius: 4px;
                 font-weight: bold;
-                font-size: 14px;
+                font-size: 16px;
+                padding: 4px 8px;
             }
             QPushButton:hover {
                 background-color: #feb2b2;