[FIX] style: rotation fix for centered text

Task: 5400633

Author: fdamhaut

packages/o-spreadsheet-engine/src/helpers/text_helper.ts

@@ -469,6 +469,12 @@ export function computeRotationPosition(
   } else {
     if (center) {
       x -= sh / 2;
+      y -= height / 2;
+      if (rotateTowardCellCenter) {
+        y += sh;
+      } else {
+        y -= sh;
+      }
     } else if (rotateTowardCellCenter) {
       x -= sh;
       y -= sw / 2;

tests/helpers/text_helper.test.ts

@@ -160,7 +160,7 @@ describe("computeRotationPosition", () => {
     test.each([Math.PI / 2, Math.PI / 3, Math.PI / 4])("Positive Rotation", (rotation) => {
       const sin = Math.sin(rotation);
       const newX = textBox.x + (sin * textHeight) / 2;
-      const newY = textBox.y;
+      const newY = textBox.y - textHeight / 2 + sin * textHeight;
 
       expect(computeRotationPosition(textBox, { ...style, rotation })).toMatchObject({
         x: expect.toBeCloseTo(rotate(newX, newY, rotation).x),
@@ -171,7 +171,7 @@ describe("computeRotationPosition", () => {
     test.each([-Math.PI / 2, -Math.PI / 3, -Math.PI / 4])("Negative Rotation", (rotation) => {
       const sin = Math.sin(rotation);
       const newX = textBox.x + (sin * textHeight) / 2;
-      const newY = textBox.y;
+      const newY = textBox.y - textHeight / 2 - sin * textHeight;
       expect(computeRotationPosition(textBox, { ...style, rotation })).toMatchObject({
         x: expect.toBeCloseTo(rotate(newX, newY, rotation).x),
         y: expect.toBeCloseTo(rotate(newX, newY, rotation).y),