Fix profile dialog form fields collapsing to sizeHint on macOS

QFormLayout without an explicit field growth policy falls back to the
active Qt style's default, which differs per platform: Linux's Fusion/Breeze
styles expand fields to fill the row, but macOS's native style defaults to
FieldsStayAtSizeHint, leaving fields small with empty space beside them.
Set the policy explicitly so the dialog renders consistently everywhere.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/profile_dialog.cpp

@@ -71,6 +71,9 @@ ProfileDialog::ProfileDialog(QWidget* parent)
 
     auto* layout = new QVBoxLayout(this);
     auto* form = new QFormLayout();
+    form->setFieldGrowthPolicy(QFormLayout::ExpandingFieldsGrow);
+    form->setFormAlignment(Qt::AlignLeft | Qt::AlignTop);
+    form->setLabelAlignment(Qt::AlignRight);
 
     m_nameInput->setPlaceholderText(QStringLiteral("Production Bastion"));
     m_hostInput->setPlaceholderText(QStringLiteral("example.internal"));