feat(webui): switch model presets from the composer (#5077)

webui/src/tests/session-search-dialog.test.tsx

@@ -25,7 +25,7 @@ describe("SessionSearchDialog", () => {
     render(
       <SessionSearchDialog
         open
-        sessions={[session(1)]}
+        sessions={[{ ...session(1), title: "Model chat", preview: "/model fast" }]}
         activeKey={null}
         loading={false}
         onOpenChange={() => {}}
@@ -38,6 +38,11 @@ describe("SessionSearchDialog", () => {
     expect(dialog.className).not.toContain("bg-popover/");
     expect(dialog.className).not.toContain("backdrop-blur");
     expect(screen.getByTestId("session-search-scroll")).toHaveClass("overflow-y-auto");
+    expect(screen.queryByText("/model fast")).not.toBeInTheDocument();
+    fireEvent.change(screen.getByRole("textbox", { name: "Search" }), {
+      target: { value: "model fast" },
+    });
+    expect(screen.queryByText("Model chat")).not.toBeInTheDocument();
   });
 
   it("keeps keyboard navigation scrollable through long result lists", () => {