refactor: optimize keyboard height updates and improve viewport coordinate state transitions

src/components/Componentes/question-viewport-coordinator.ts

@@ -3,8 +3,7 @@
 import { useEffect } from "react";
 import { viewPaddingsBridge } from "@/lib/view-paddings";
 
-const KEYBOARD_THRESHOLD = 40;
-const DEFAULT_KEYBOARD_HEIGHT = 280;
+const KEYBOARD_THRESHOLD = 20;
 const QUESTION_GAP = 16;
 const LIFT_VARIABLE = "--question-lift-y";
 
@@ -152,7 +151,10 @@ function scheduleLiftUpdate() {
 }
 
 export function updateQuestionKeyboardHeight(height: number) {
-  keyboardHeight = Math.max(0, height);
+  const nextHeight = Math.max(0, height);
+  if (Math.abs(nextHeight - keyboardHeight) < 1) return;
+
+  keyboardHeight = nextHeight;
   keyboardVisible = keyboardHeight > KEYBOARD_THRESHOLD;
   if (keyboardVisible) {
     lastKeyboardHeight = keyboardHeight;
@@ -194,14 +196,8 @@ export function useQuestionViewportCoordinator() {
     const handleFocusIn = (event: FocusEvent) => {
       if (!isActiveQuestionKeyboardInput(event.target)) return;
       activeQuestionInput = event.target;
-
-      // Start with the last known keyboard geometry or standard default so lifting begins in the
-      // same frame as focus; Flutter/visualViewport then replaces it with the exact height.
-      if (!keyboardVisible) {
-        keyboardHeight =
-          lastKeyboardHeight > KEYBOARD_THRESHOLD
-            ? lastKeyboardHeight
-            : DEFAULT_KEYBOARD_HEIGHT;
+      if (lastKeyboardHeight > KEYBOARD_THRESHOLD) {
+        keyboardHeight = lastKeyboardHeight;
         keyboardVisible = true;
       }
       scheduleLiftUpdate();
@@ -214,8 +210,12 @@ export function useQuestionViewportCoordinator() {
         )
           ? document.activeElement
           : null;
-        if (!activeQuestionInput) scheduleLiftUpdate();
-      }, 0);
+        if (!activeQuestionInput) {
+          keyboardVisible = false;
+          keyboardHeight = 0;
+          scheduleLiftUpdate();
+        }
+      }, 50);
     };
 
     const unsubscribeConfig = viewPaddingsBridge.subscribeConfig((config) => {
@@ -235,7 +235,7 @@ export function useQuestionViewportCoordinator() {
           lastKeyboardHeight = keyboardHeight;
           scheduleLiftUpdate();
         }
-      } else if (keyboardHeight <= KEYBOARD_THRESHOLD) {
+      } else if (reduction <= KEYBOARD_THRESHOLD && keyboardHeight <= KEYBOARD_THRESHOLD) {
         keyboardVisible = false;
         keyboardHeight = 0;
         closedViewportHeight = viewportHeight;