fix: initialized notification dot state set to inactive

[choeying-10]

Summary

• Set default notificationStatus.<courseId> initialization to inactive in both sidebar trigger implementations.
• Add provider fallback to inactive when local storage status is missing.
• Baseline upgradeNotificationLastSeen on first load without forcing notificationStatus to active.
• Keep existing re-activation behavior when upgrade notification state actually changes.

Why

Learners were seeing a red dot even when no meaningful notification content was available. This change reduces misleading red-dot states while preserving existing transition-driven activation behavior.

Files changed

• src/courseware/course/sidebar/sidebars/notifications/NotificationTrigger.jsx
• src/courseware/course/new-sidebar/sidebars/discussions-notifications/DiscussionsNotificationsTrigger.tsx
• src/courseware/course/sidebar/SidebarContextProvider.jsx
• src/courseware/course/new-sidebar/SidebarContextProvider.tsx
• src/courseware/course/sidebar/sidebars/notifications/NotificationTrigger.test.jsx

[choeying-10]

Notification Tray Findings (Learning MFE)

Current rendering logic in NotificationTray is gated by verifiedMode:

verifiedMode === true -> renders NotificationTraySlot
verifiedMode === false -> renders fallback message:
"You have no new notifications at this time."

<div>{verifiedMode
  ? (
    <NotificationTraySlot
      courseId={courseId}
      notificationCurrentState={upgradeNotificationCurrentState}
      setNotificationCurrentState={setUpgradeNotificationCurrentState}
    />
  ) : (
    <p className="p-3 small">{intl.formatMessage(messages.noNotificationsMessage)}</p>
  )}
</div>

Important detail:

NotificationTraySlot is only a plugin-slot container. Actual notification UI/content must come from runtime plugin registration/wiring.

Runtime Configuration Observation

In Tutor runtime config (tutor/env/plugins/mfe/build/mfe/env.config.jsx), the Learning block is empty (same in both local and staging):

if (process.env.APP_ID == 'learning') {
}

This means there is no explicit custom widget registration for Learning notification tray slots via this config.

Observed Behavior

In verified-mode courses: tray opens, but no notification items are rendered (empty panel).
In non-verified courses: fallback message is shown as expected.