union errors aren't handled properly with Vee-Validate 4 + Zod 4

[BlueskyFR]

What happened?

Until Vee-Validate 5 is stable it would be nice to piece up the last remaining little bits to make VV 4 compatible with Zod 4.

Reproduction steps

ZodIssue's field unionErrors was renamed to errors in Zod 4 and it's childs do not require accessing .issues anymore.

Version

Vue.js 3.x and vee-validate 4.x

What browsers are you seeing the problem on?

• Firefox
• Chrome
• Safari
• Microsoft Edge

Relevant log output

vee-validate-zod.mjs:139 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'flatMap')
    at vee-validate-zod.mjs:139:45
    at Array.forEach (<anonymous>)
    at processIssues (vee-validate-zod.mjs:136:12)
    at Object.parse (vee-validate-zod.mjs:83:13)
    at async validateTypedSchema (vee-validate.mjs:967:30)
    at async _validateSchema (vee-validate.mjs:2859:15)
    at async vee-validate.mjs:2373:17
    at async Object.runLatest [as validateSchema] (vee-validate.mjs:518:24)
    at async validateCurrentValue (vee-validate.mjs:1646:33)
    at async runLatest (vee-validate.mjs:518:24)

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