Polling providers (traffic/system monitor) don't start timer when dashboardDomainReadyProvider already resolved

[AustinChangLinksys]

Problem

Dashboard traffic cards and Statistics page show "Waiting for data..." indefinitely when:

1. User logs in and navigates to Dashboard
2. dashboardDomainReadyProvider completes before uspTrafficAnalysisProvider / uspSystemMonitorProvider are first read
3. The polling providers use ref.listen(dashboardDomainReadyProvider, ...) to start their timers
4. ref.listen() only fires on state changes — if the provider was already AsyncData when the listener was registered, the callback never fires
5. Timer never starts → data never fetched → UI stuck on loading state

Root Cause

ref.listen(dashboardDomainReadyProvider, (_, next) {
  if (next is AsyncData) {
    setRefreshInterval(defaultInterval);  // Never called if already AsyncData
  }
});

Affected Components

• UspTrafficAnalysisNotifier — Dashboard traffic card, Statistics page traffic sections
• UspSystemMonitorNotifier — Dashboard system status card, Statistics page system sections

Fix

Add immediate state check after registering the listener to handle the case where the condition is already met:

final domainReady = ref.read(dashboardDomainReadyProvider);
final isAuthenticated = ref.read(appConnectionStateProvider) == AppConnectionState.authenticated;
if (domainReady is AsyncData && isAuthenticated) {
  Future.microtask(() => setRefreshInterval(defaultInterval));
}

PR

#962

[AustinChangLinksys]

🔍 Automated investigation (preliminary triage)

Line: 2.x / USP (TR-369)

Root cause:

• UI defect: ref.listen(dashboardDomainReadyProvider, ...) only fires on state changes. When UspTrafficAnalysisNotifier / UspSystemMonitorNotifier are first read after dashboardDomainReadyProvider has already emitted AsyncData, the listener never fires → setRefreshInterval is never called → polling timer never starts → Dashboard traffic/system cards stuck on "Waiting for data..." indefinitely.

Evidence (from issue body):

Root-cause code path identified by Austin:

ref.listen(dashboardDomainReadyProvider, (_, next) {
  if (next is AsyncData) {
    setRefreshInterval(defaultInterval);  // Never called if already AsyncData
  }
});

Proposed fix (immediate read + microtask guard):

final domainReady = ref.read(dashboardDomainReadyProvider);
final isAuthenticated = ref.read(appConnectionStateProvider) == AppConnectionState.authenticated;
if (domainReady is AsyncData && isAuthenticated) {
  Future.microtask(() => setRefreshInterval(defaultInterval));
}

Affected notifiers: UspTrafficAnalysisNotifier (Dashboard traffic card, Statistics traffic sections), UspSystemMonitorNotifier (Dashboard system status card, Statistics system sections). Related PR: #962.

Confidence: Medium — root cause structurally clear from code path; no attached log/screenshot to independently verify runtime behaviour, pending code-level confirmation.

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Auto-generated triage by Austin's tooling, pending Austin's review. Not a fix commitment.