fix(a11y): increase toast timeout for WCAG 2.2.1 compliance

[wilsuriel03]

This PR addresses issue #463 by increasing the toast notification timeout to ensure adequate reading time for all users, including those with disabilities.

Changes:

• Set default toast duration to 10000ms (10 seconds)
• Extended error toast duration to 12000ms
• Ensured minimum duration enforcement for all toast types

These changes improve accessibility by:

• Giving users more time to read and process toast notifications
• Ensuring error messages have extra visibility time
• Maintaining WCAG 2.2.1 compliance for timed content

Future considerations (V2):

• I'm working on a new UI that will integrate persistent status banners at the page level
• I'm planning to implement inline feedback for form actions and critical updates