Summary

• Prevents "Invalid email" from showing immediately on every keystroke during signup
• Validation now only triggers after the user has interacted with a field and moved focus away

Changes

• apps/web/modules/signup-view.tsx: Change react-hook-form validation mode from "onChange" to "onTouched"

Root Cause

With mode: "onChange", react-hook-form runs the Zod schema validation on every keystroke. This causes the email field to show "Invalid email" as soon as the user types a single character, even though they haven't finished entering their email. This is a poor UX experience that makes the form feel aggressive.

Fix

Switch to mode: "onTouched" which:

• Only runs validation after the field has been "touched" (blurred at least once)
• After first blur, validates on every subsequent change (so real-time feedback still works for password strength hints)
• Doesn't show errors during initial typing

Test plan

• Type email slowly — no "Invalid email" error appears during typing
• Tab away from incomplete email field — error appears
• Fix the email and continue — error clears in real-time
• Password strength hints still update in real-time after interacting with the field
• Form submission still validates all fields
• Biome lint passes — no new warnings

Fixes #19163