feat(webapp): add session persistence via URL hash routing + sessionStorage

- app.js: hash-based router (#runs / #new / #profiles / #report/{runId})
  - navigate() pushes history entries for back/forward support
  - _restoreSession() reads hash on load and popstate
  - sessionStorage fallback for same-tab refreshes
  - run-card highlights selected run (.run-card.selected)
- runner.js: use App.navigate() for report redirect; persist lastRunId to sessionStorage
- index.html: report nav button starts disabled (enabled on run select/restore)
- app.css: .run-card.selected with petrol border + ring

Co-Authored-By: Claude <noreply@anthropic.com>

webapp/static/css/app.css

@@ -295,6 +295,12 @@ table.group-table td { border-bottom: 1px solid #f1f5f9; font-variant-numeric: t
 .btn-danger { color: var(--bad); border-color: var(--bad); }
 .btn-danger:hover { background: #fee2e2; }
 
+/* 选中态 run 卡片 */
+.run-card.selected {
+  border-color: var(--petrol);
+  box-shadow: 0 0 0 2px rgba(0,153,153,0.25), var(--shadow);
+}
+
 /* ---------- LLM 角色配置面板 ---------- */
 .llm-assignment-panel { border-left: 3px solid var(--petrol); }
 .llm-role-rows { display: flex; flex-direction: column; gap: 10px; }

webapp/static/index.html

@@ -22,7 +22,7 @@
         <button class="nav-item" data-view="new">
           <span class="nav-ico">＋</span><span>新建评估</span>
         </button>
-        <button class="nav-item" data-view="report" data-requires-run="1">
+        <button class="nav-item" data-view="report" data-requires-run="1" disabled>
           <span class="nav-ico">▤</span><span>报告详情</span>
         </button>
         <button class="nav-item" data-view="profiles">

webapp/static/js/app.js

@@ -1,29 +1,59 @@
 // app.js — 视图路由、运行列表渲染、健康检查。整个控制台的入口编排。
+// 会话保持：URL hash 路由（#runs / #new / #profiles / #report/{runId}）
+//            + sessionStorage 兜底，F5 刷新 / 浏览器前进后退均可恢复。
 
 const App = {
   currentRunId: null,
+  activeView: null,
   views: ["runs", "new", "report", "profiles"],
   titles: { runs: "运行列表", new: "新建评估", report: "报告详情", profiles: "LLM 配置" },
 
-  // 初始化：绑定导航、加载首屏、启动健康检查。
+  // 初始化：绑定导航、从 URL/sessionStorage 恢复上次位置、启动健康检查。
   init() {
     document.querySelectorAll(".nav-item").forEach((btn) => {
-      btn.addEventListener("click", () => App.switchView(btn.dataset.view));
+      btn.addEventListener("click", () => App.navigate(btn.dataset.view));
     });
     document.getElementById("refresh-btn").addEventListener("click", () => App.refreshCurrent());
 
     Runner.init();
     Profiles.init();
-    App.switchView("runs");
+
+    // 恢复上次会话（优先 URL hash，其次 sessionStorage）
+    App._restoreSession();
+
     App.checkHealth();
     setInterval(App.checkHealth, 15000);
+
+    // 浏览器前进 / 后退按钮
+    window.addEventListener("popstate", () => App._restoreSession());
   },
 
-  // 切换主视图，并同步导航高亮与标题。
-  switchView(view) {
-    if (view === "report" && !App.currentRunId) {
-      // 没有选中的运行时，报告页显示占位。
+  // ----------------------------------------------------------------
+  // 路由 —— 有历史记录的主动导航（更新 URL hash）
+  // ----------------------------------------------------------------
+  navigate(view, runId) {
+    if (runId !== undefined) App.currentRunId = runId;
+    const hash = App._buildHash(view, App.currentRunId);
+    if (location.hash !== `#${hash}`) {
+      history.pushState({ view, runId: App.currentRunId }, "", `#${hash}`);
     }
+    App._doSwitch(view);
+  },
+
+  // 供内部调用（不产生历史记录），例如刷新同一视图
+  switchView(view) {
+    App._doSwitch(view);
+  },
+
+  // 刷新当前视图数据
+  refreshCurrent() {
+    App._doSwitch(App.activeView || "runs");
+  },
+
+  // ----------------------------------------------------------------
+  // 内部：实际切换 DOM + 触发数据加载
+  // ----------------------------------------------------------------
+  _doSwitch(view) {
     App.views.forEach((name) => {
       const el = document.getElementById(`view-${name}`);
       if (el) el.hidden = name !== view;
@@ -34,18 +64,53 @@ const App = {
     document.getElementById("view-title").textContent = App.titles[view] || view;
     App.activeView = view;
 
+    // 持久化到 sessionStorage（URL 共享场景的备份）
+    sessionStorage.setItem("rag_view", view);
+    if (App.currentRunId) sessionStorage.setItem("rag_run_id", App.currentRunId);
+
     if (view === "runs")     App.loadRuns();
     if (view === "new")      Runner.loadScenarios();
     if (view === "report")   Report.render(App.currentRunId);
     if (view === "profiles") Profiles.load();
   },
 
-  // 刷新当前视图的数据。
-  refreshCurrent() {
-    App.switchView(App.activeView || "runs");
+  // ----------------------------------------------------------------
+  // Hash 工具
+  // ----------------------------------------------------------------
+  _buildHash(view, runId) {
+    if (view === "report" && runId) {
+      return `report/${encodeURIComponent(runId)}`;
+    }
+    return view || "runs";
   },
 
-  // 加载并渲染运行列表。
+  _parseHash() {
+    const raw = location.hash.replace(/^#\/?/, "");
+    if (!raw) return { view: null, runId: null };
+    if (raw.startsWith("report/")) {
+      const runId = decodeURIComponent(raw.slice("report/".length));
+      return { view: "report", runId };
+    }
+    const view = App.views.includes(raw) ? raw : null;
+    return { view, runId: null };
+  },
+
+  // 会话恢复：hash → sessionStorage → 默认 runs
+  _restoreSession() {
+    const { view: hView, runId: hRunId } = App._parseHash();
+    const view   = hView  || sessionStorage.getItem("rag_view")   || "runs";
+    const runId  = hRunId || sessionStorage.getItem("rag_run_id") || null;
+
+    if (runId) {
+      App.currentRunId = runId;
+      App.enableReportNav();
+    }
+    App._doSwitch(view);
+  },
+
+  // ----------------------------------------------------------------
+  // 运行列表
+  // ----------------------------------------------------------------
   async loadRuns() {
     const container = document.getElementById("runs-container");
     const empty = document.getElementById("runs-empty");
@@ -66,14 +131,16 @@ const App = {
     }
   },
 
-  // 构造一张运行卡片。
   renderRunCard(run) {
     const card = document.createElement("div");
-    card.className = "run-card";
+    card.className = "run-card" + (run.run_id === App.currentRunId ? " selected" : "");
+
     card.addEventListener("click", () => {
-      App.currentRunId = run.run_id;
+      // 更新选中高亮
+      document.querySelectorAll(".run-card").forEach((c) => c.classList.remove("selected"));
+      card.classList.add("selected");
       App.enableReportNav();
-      App.switchView("report");
+      App.navigate("report", run.run_id);
     });
 
     const chips = (run.metrics || [])
@@ -81,7 +148,7 @@ const App = {
         const val = run.metric_means ? run.metric_means[m] : null;
         const cls = App.scoreClass(val);
         const text = val === null || val === undefined ? "n/a" : val.toFixed(2);
-        return `<span class="metric-chip">${App.escape(App.shortMetric(m))} <b class="${cls}">${text}</b></span>`;
+        return `<span class="metric-chip" title="${App.escape(m)}">${App.escape(App.shortMetric(m))} <b class="${cls}">${text}</b></span>`;
       })
       .join("");
 
@@ -98,13 +165,14 @@ const App = {
     return card;
   },
 
-  // 启用报告导航项（选中运行后）。
+  // ----------------------------------------------------------------
+  // 工具方法
+  // ----------------------------------------------------------------
   enableReportNav() {
     const btn = document.querySelector('.nav-item[data-view="report"]');
     if (btn) btn.disabled = false;
   },
 
-  // 根据分值返回 good/warn/bad/na 配色类。
   scoreClass(value) {
     if (value === null || value === undefined) return "na";
     if (value >= 0.8) return "good";
@@ -112,7 +180,6 @@ const App = {
     return "bad";
   },
 
-  // 指标名缩写，节省卡片横向空间。
   shortMetric(name) {
     const map = {
       faithfulness:        "faith.",
@@ -126,20 +193,17 @@ const App = {
     return map[name] || name;
   },
 
-  // 截取时间戳到分钟，便于阅读。
   shortTime(iso) {
     if (!iso) return "—";
     return String(iso).replace("T", " ").slice(0, 16);
   },
 
-  // 简单 HTML 转义，防止注入。
   escape(text) {
     const div = document.createElement("div");
     div.textContent = text == null ? "" : String(text);
     return div.innerHTML;
   },
 
-  // 健康检查，更新左下角状态点。
   async checkHealth() {
     const dot   = document.getElementById("health-dot");
     const label = document.getElementById("health-text");

webapp/static/js/runner.js

@@ -10,9 +10,8 @@ const Runner = {
     document.getElementById("run-btn").addEventListener("click", () => Runner.trigger());
     document.getElementById("view-report-btn").addEventListener("click", () => {
       if (Runner.lastRunId) {
-        App.currentRunId = Runner.lastRunId;
         App.enableReportNav();
-        App.switchView("report");
+        App.navigate("report", Runner.lastRunId);
       }
     });
   },
@@ -164,6 +163,7 @@ const Runner = {
           runBtn.disabled = false;
           if (status.status === "completed" && status.run_id) {
             Runner.lastRunId = status.run_id;
+            sessionStorage.setItem("rag_run_id", status.run_id);
             reportBtn.hidden = false;
           }
         }