fix(web): show source mismatch reason in status chain

apps/web/messages/en.json

@@ -3672,7 +3672,7 @@
         "mcpDetail": "top={topTool}; first-class={firstClass}; legacy={legacy}; policy={policy}",
         "source": "Sentry / SigNoz",
         "sourceValue": "{status}; direct {direct}, candidate {candidate}, applied {applied}",
-        "sourceDetail": "{providers}",
+        "sourceDetail": "{providers}; reason={reason}",
         "execution": "Executor",
         "executionValue": "{executor} / {status}",
         "executionDetail": "operation={operation}; action={action}; ops={ops}",
@@ -3689,7 +3689,15 @@
         "directCandidate": "Direct / Candidate / Applied",
         "directCandidateValue": "{direct} / {candidate} / {applied}",
         "latestApplied": "最新套用事件",
+        "reason": "未匹配原因",
         "providers": "Provider",
+        "reasons": {
+          "providerHeartbeatNoMatch": "Provider 有心跳，但這個 Incident 尚未匹配",
+          "noMatchingProviderSourceEvent": "查無可匹配的 Sentry / SigNoz 事件",
+          "noIncidentIds": "缺 Incident ID，無法關聯",
+          "incidentNotFound": "Incident 記錄不存在",
+          "fetchFailed": "讀取來源關聯失敗"
+        },
         "flow": {
           "providerIngress": "Provider 接收",
           "sourceEvidence": "來源證據",

apps/web/messages/zh-TW.json

@@ -3672,7 +3672,7 @@
         "mcpDetail": "top={topTool}; first-class={firstClass}; legacy={legacy}; policy={policy}",
         "source": "Sentry / SigNoz",
         "sourceValue": "{status}; direct {direct}, candidate {candidate}, applied {applied}",
-        "sourceDetail": "{providers}",
+        "sourceDetail": "{providers}; reason={reason}",
         "execution": "Executor",
         "executionValue": "{executor} / {status}",
         "executionDetail": "operation={operation}; action={action}; ops={ops}",
@@ -3689,7 +3689,15 @@
         "directCandidate": "Direct / Candidate / Applied",
         "directCandidateValue": "{direct} / {candidate} / {applied}",
         "latestApplied": "最新套用事件",
+        "reason": "未匹配原因",
         "providers": "Provider",
+        "reasons": {
+          "providerHeartbeatNoMatch": "Provider 有心跳，但這個 Incident 尚未匹配",
+          "noMatchingProviderSourceEvent": "查無可匹配的 Sentry / SigNoz 事件",
+          "noIncidentIds": "缺 Incident ID，無法關聯",
+          "incidentNotFound": "Incident 記錄不存在",
+          "fetchFailed": "讀取來源關聯失敗"
+        },
         "flow": {
           "providerIngress": "Provider 接收",
           "sourceEvidence": "來源證據",

apps/web/src/components/awooop/status-chain.tsx

@@ -276,8 +276,16 @@ export function AwoooPStatusChainPanel({
     no_incident_context: t("source.verificationStatuses.noIncidentContext"),
     fetch_failed: t("source.verificationStatuses.fetchFailed"),
   };
+  const sourceReasonLabels: Record<string, string> = {
+    provider_heartbeat_present_but_no_incident_match: t("source.reasons.providerHeartbeatNoMatch"),
+    no_matching_provider_source_event: t("source.reasons.noMatchingProviderSourceEvent"),
+    no_incident_ids: t("source.reasons.noIncidentIds"),
+    incident_not_found: t("source.reasons.incidentNotFound"),
+    source_correlation_fetch_failed: t("source.reasons.fetchFailed"),
+  };
   const sourceStatus = String(sourceCorrelation?.status ?? "missing");
   const sourceVerificationStatus = String(sourceCorrelation?.verification_status ?? sourceStatus);
+  const sourceMissingReason = String(sourceCorrelation?.missing_reason ?? "");
   const topAppliedLink = sourceCorrelation?.top_candidates?.find(
     (item) => item.link_state === "applied"
   );
@@ -398,6 +406,7 @@ export function AwoooPStatusChainPanel({
       }),
       detail: t("toolchain.sourceDetail", {
         providers: sourceProviderSummary || emptyLabel,
+        reason: sourceReasonLabels[sourceMissingReason] ?? valueOrEmpty(sourceMissingReason, emptyLabel),
       }),
     },
     {
@@ -603,7 +612,7 @@ export function AwoooPStatusChainPanel({
               </div>
             ))}
           </div>
-          <div className="grid gap-px bg-[#e0ddd4] md:grid-cols-5">
+          <div className="grid gap-px bg-[#e0ddd4] md:grid-cols-6">
             <div className="min-w-0 bg-white px-4 py-3">
               <p className="text-xs font-semibold text-[#77736a]">{t("source.status")}</p>
               <p className="mt-2 truncate font-mono text-sm text-[#141413]" title={sourceStatusLabels[sourceStatus] ?? sourceStatus}>
@@ -635,6 +644,15 @@ export function AwoooPStatusChainPanel({
                 {latestAppliedLabel}
               </p>
             </div>
+            <div className="min-w-0 bg-white px-4 py-3">
+              <p className="text-xs font-semibold text-[#77736a]">{t("source.reason")}</p>
+              <p
+                className="mt-2 truncate font-mono text-sm text-[#141413]"
+                title={sourceReasonLabels[sourceMissingReason] ?? sourceMissingReason}
+              >
+                {sourceReasonLabels[sourceMissingReason] ?? valueOrEmpty(sourceMissingReason, emptyLabel)}
+              </p>
+            </div>
             <div className="min-w-0 bg-white px-4 py-3">
               <p className="text-xs font-semibold text-[#77736a]">{t("source.providers")}</p>
               <p className="mt-2 truncate font-mono text-sm text-[#141413]" title={sourceProviderSummary}>