feat(web): drive incident flow summaries from status chain

apps/web/messages/en.json

@@ -420,6 +420,11 @@
       "aiProposalPreview": "AI Proposal: {action}",
       "flowCurrentLabel": "Current stage",
       "flowNextLabel": "Next step",
+      "flowSourceLabel": "Source",
+      "flowSourceTruthChain": "truth-chain / ADR-100",
+      "flowSourceHeuristic": "incident status heuristic",
+      "flowVerdictLabel": "Verdict",
+      "flowTruthChainCurrent": "{stage} / {status}",
       "flowComplete": "Complete",
       "flowStages": {
         "alert": "Alert received",

apps/web/messages/zh-TW.json

@@ -421,6 +421,11 @@
       "aiProposalPreview": "AI 提案：{action}",
       "flowCurrentLabel": "目前階段",
       "flowNextLabel": "下一步",
+      "flowSourceLabel": "來源",
+      "flowSourceTruthChain": "truth-chain / ADR-100",
+      "flowSourceHeuristic": "事件狀態推導",
+      "flowVerdictLabel": "判定",
+      "flowTruthChainCurrent": "{stage} / {status}",
       "flowComplete": "已完成",
       "flowStages": {
         "alert": "告警收到",