fix(app): model selection persist by session (#17348)

packages/app/src/context/model-variant.test.ts

@@ -44,6 +44,16 @@ describe("model variant", () => {
     expect(value).toBe("high")
   })
 
+  test("lets an explicit default override the configured variant", () => {
+    const value = resolveModelVariant({
+      variants: ["low", "high", "xhigh"],
+      selected: null,
+      configured: "xhigh",
+    })
+
+    expect(value).toBeUndefined()
+  })
+
   test("cycles from configured variant to next", () => {
     const value = cycleModelVariant({
       variants: ["low", "high", "xhigh"],
@@ -63,4 +73,14 @@ describe("model variant", () => {
 
     expect(value).toBe("low")
   })
+
+  test("cycles from an explicit default to the first variant", () => {
+    const value = cycleModelVariant({
+      variants: ["low", "high", "xhigh"],
+      selected: null,
+      configured: "xhigh",
+    })
+
+    expect(value).toBe("low")
+  })
 })