Fix stat kind dropdown sizing to match number inputs

The new kind <select> fell through to the generic input/select CSS
rule instead of the compact .se-num sizing, making it visually
inconsistent with the min/max/initial number boxes next to it.

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

frontend/src/SchemaEditor.jsx

@@ -86,7 +86,7 @@ function StatEditor({ statKey, def, onRenameKey, onChange, onRemove }) {
           </>
         )}
         <Num label="cooldown" value={def.cooldown} onChange={(v) => set('cooldown', v)} />
-        <label className="se-num">
+        <label className="se-num se-kind">
           <span>kind</span>
           <select value={isText ? 'text' : (def.type === 'counter' ? 'counter' : 'number')}
             onChange={(e) => setType(e.target.value === 'number' ? undefined : e.target.value)}>