NSS suggestions

Module: Global UI, all modules (OPD, Billing, Radiology, etc.)
Environment: Test, NSSH (https://nssh.test.clinq.health)
Type: Bug / UX
Severity: Low–Medium (blocks part of the screen and slows down busy users such as front desk staff and doctors)
Priority: P3

Description
Toast notifications such as “Saved”, “Patient registered” or “Prescription signed” stay on screen for more than 5 seconds. They cover buttons and content, and there’s no way to close them early. On busy screens they pile up.

Steps to reproduce

Do any action that shows a toast, for example registering a patient, saving a draft or signing a prescription.
Watch how long the toast stays on screen.
Try to close it.

Expected result

Toasts close on their own sooner:
Success or info: about 3 seconds
Warning: about 5 seconds
Error: stays until dismissed, so the user doesn’t miss it
Every toast has a ✕ close button, and can also be dismissed by clicking or swiping it.
Hovering over a toast pauses the auto-close timer.
Several toasts stack neatly, with a limit of about 3 visible at once, and don’t cover important actions such as Register Patient or Sign.

Actual result
Toasts stay for more than 5 seconds, can’t be closed manually, and cover parts of the screen.

Acceptance criteria

Success and info toasts close automatically within about 3 seconds.
Error toasts stay until the user dismisses them.
Every toast has a close button.
Hovering pauses the timer.
At most 3 toasts are visible at a time, and older ones are removed first.
Toasts don’t overlap primary action buttons.

Notes

Toasts probably come from a shared toast component, so a single fix to its default duration and its dismissible setting will apply everywhere.