fix: Shadow offsets and numeric colors not working in CSS on web (#7864)

## Summary

This PR fixes issues noticed while testing CSS in the web example app

## Example recordings

All of examples below didn't work before this PR

### numeric colors

Numeric colors were ignored and `undefined` was returned instead. I
added conversion to the RGBA string to make it work.


https://github.com/user-attachments/assets/df617a80-e897-4812-b733-f0bb6a560674

### shadowOffset


https://github.com/user-attachments/assets/c4b5f7bc-6a71-4f93-bd28-2ec4acd6cb9d

### textShadowOffset


https://github.com/user-attachments/assets/115dac49-2399-4ad0-b62c-79c7bc21d01f

Author: MatiPl01

packages/react-native-reanimated/src/css/platform/web/style/builders/shadows.ts

@@ -9,13 +9,8 @@ import { processColor } from '../processors';
 
 type ShadowOffset = NonNullable<ViewStyle['shadowOffset']>;
 
-const processShadowOffset: ValueProcessor<
-  ShadowOffset,
-  Record<string, string> | string
-> = (value) => ({
-  width: `${value.width}px`,
-  height: `${value.height}px`,
-});
+const processShadowOffset: ValueProcessor<ShadowOffset, string> = (value) =>
+  `${value.width}px ${value.height}px`;
 
 type BoxShadowProps = Pick<
   ViewStyle,

packages/react-native-reanimated/src/css/platform/web/style/processors/colors.ts

@@ -1,9 +1,16 @@
 'use strict';
 import type { ColorValue } from 'react-native';
 
+import { convertToRGBA, rgbaArrayToRGBAColor } from '../../../../../Colors';
+import { isNumber } from '../../../../utils';
 import type { ValueProcessor } from '../types';
 
 export const processColor: ValueProcessor<ColorValue> = (value) => {
+  if (isNumber(value)) {
+    const rgbaArray = convertToRGBA(value);
+    return rgbaArrayToRGBAColor(rgbaArray);
+  }
+
   if (typeof value !== 'string') {
     return;
   }