fix: make SQL editor scrollable when query overflows the panel

@uiw/react-codemirror's outer wrapper inherited h-full but the inner
.cm-editor / .cm-scroller had no height constraint, so long queries
spilled outside the visible area with no way to scroll. Pass
`height="100%"` to the CodeMirror component and pin .cm-editor to the
wrapper height via a Tailwind arbitrary selector so the scroller
renders correctly inside the resizable panel.

src/components/editor/SqlEditor.tsx

@@ -81,7 +81,11 @@ export function SqlEditor({ value, onChange, onExecute, onFormat, schema }: Prop
       onChange={handleChange}
       extensions={extensions}
       theme="dark"
-      className="h-full text-sm"
+      // height="100%" propagates down to .cm-editor so the inner .cm-scroller
+      // can render a vertical scrollbar; without it, long queries overflow the
+      // flex container and the editor cannot be scrolled.
+      height="100%"
+      className="h-full text-sm [&_.cm-editor]:h-full"
       basicSetup={{
         lineNumbers: true,
         foldGutter: true,