fix(chat): calibrate Facebook IAB keyboard fallback

src/app/chat/hooks/__tests__/chat-keyboard-geometry.test.ts

@@ -84,27 +84,36 @@ describe("resolveChatKeyboardInset", () => {
 
 describe("resolveChatKeyboardFallbackInset", () => {
   it.each([
-    [{ layoutWidth: 320, layoutHeight: 568 }, 256],
-    [{ layoutWidth: 360, layoutHeight: 640 }, 285],
-    [{ layoutWidth: 390, layoutHeight: 844 }, 316],
-    [{ layoutWidth: 430, layoutHeight: 932 }, 347],
+    [{ layoutWidth: 320, layoutHeight: 568 }, 260],
+    [{ layoutWidth: 360, layoutHeight: 640 }, 291],
+    [{ layoutWidth: 390, layoutHeight: 844 }, 344],
+    [{ layoutWidth: 430, layoutHeight: 932 }, 356],
   ])("fits common viewport %o", (viewport, expectedInset) => {
     expect(resolveChatKeyboardFallbackInset(viewport)).toBe(expectedInset);
   });
 
+  it("covers the reported 392 by 760 Facebook viewport", () => {
+    expect(
+      resolveChatKeyboardFallbackInset({
+        layoutWidth: 392,
+        layoutHeight: 760,
+      }),
+    ).toBe(343);
+  });
+
   it("stays stable across tall viewports with the same width", () => {
     expect(
       resolveChatKeyboardFallbackInset({
         layoutWidth: 390,
         layoutHeight: 760,
       }),
-    ).toBe(316);
+    ).toBe(343);
     expect(
       resolveChatKeyboardFallbackInset({
         layoutWidth: 390,
         layoutHeight: 900,
       }),
-    ).toBe(316);
+    ).toBe(344);
   });
 
   it("keeps the keyboard estimate within its bounds", () => {