Fix assertion row alignment and improve delete button visibility

- Set consistent fixed height (26px) on all row widgets
- Replace × with ✕ and style as red delete button
- Add hover/pressed states and tooltip
- Reduce row height to 32px for tighter alignment

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

src/cmdforge/gui/dialogs/test_step_dialog.py

@@ -299,11 +299,11 @@ class TestStepDialog(QDialog):
         self.assertions_table.insertRow(row)
 
         # Set proper row height for widgets
-        self.assertions_table.setRowHeight(row, 36)
+        self.assertions_table.setRowHeight(row, 32)
 
         # Type dropdown
         type_combo = QComboBox()
-        type_combo.setMinimumHeight(28)
+        type_combo.setFixedHeight(26)
         type_combo.setMinimumWidth(120)
         for type_id, display_name, tooltip in self.ASSERTION_TYPES:
             type_combo.addItem(display_name, type_id)
@@ -314,12 +314,30 @@ class TestStepDialog(QDialog):
         # Value input
         value_edit = QLineEdit()
         value_edit.setPlaceholderText("Expected value (if applicable)")
-        value_edit.setMinimumHeight(28)
+        value_edit.setFixedHeight(26)
         self.assertions_table.setCellWidget(row, 1, value_edit)
 
-        # Remove button
-        btn_remove = QPushButton("×")
-        btn_remove.setFixedWidth(30)
+        # 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 {
+                background-color: #fed7d7;
+                color: #c53030;
+                border: 1px solid #fc8181;
+                border-radius: 4px;
+                font-weight: bold;
+                font-size: 14px;
+            }
+            QPushButton:hover {
+                background-color: #feb2b2;
+                border-color: #f56565;
+            }
+            QPushButton:pressed {
+                background-color: #fc8181;
+            }
+        """)
         btn_remove.clicked.connect(lambda: self._remove_assertion_row(row))
         self.assertions_table.setCellWidget(row, 2, btn_remove)