fix(chat): adjust bottom inset values and fallback delay for keyboard avoidance

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

@@ -46,7 +46,7 @@ describe("resolveChatKeyboardInset", () => {
       ),
     ).toEqual({
       keyboardVisible: true,
-      bottomInset: 308,
+      bottomInset: 316,
       source: "visual-viewport",
     });
   });
@@ -62,7 +62,7 @@ describe("resolveChatKeyboardInset", () => {
       ),
     ).toEqual({
       keyboardVisible: true,
-      bottomInset: 328,
+      bottomInset: 336,
       source: "virtual-keyboard",
     });
   });
@@ -83,8 +83,8 @@ describe("resolveChatKeyboardInset", () => {
 
 describe("resolveChatKeyboardFallbackInset", () => {
   it("scales with viewport height and remains bounded", () => {
-    expect(resolveChatKeyboardFallbackInset(500)).toBe(268);
-    expect(resolveChatKeyboardFallbackInset(800)).toBe(344);
-    expect(resolveChatKeyboardFallbackInset(1_200)).toBe(388);
+    expect(resolveChatKeyboardFallbackInset(500)).toBe(276);
+    expect(resolveChatKeyboardFallbackInset(800)).toBe(352);
+    expect(resolveChatKeyboardFallbackInset(1_200)).toBe(396);
   });
 });