Complete replacement of the old bottom-center stacking toast system:
Compact Toasts: Single toast at a time, bottom-right above buttons.
Pill shape with type-colored left border stripe, icon, message, and
optional "Learn more" link. Slides in, fades out after 3.5s. Click
to dismiss. New toasts replace the current one smoothly.
Notification Bell: 44px circle button next to the helper (?), with
red badge counter for unread notifications. Click opens panel.
Notification Panel: Glass popover above bell button showing history
of last 50 notifications. Each entry has type icon, message, relative
timestamp, and optional help link. Unread dot indicator. Clear All
button. Marks all as read when panel opens.
Same showToast(message, type, helpSection) signature — all 842
callers unchanged. Deduplication preserved. Updated version modal
and helper What's New.
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