diff --git a/diagnostic/build-0dde0a52-part001.logd b/diagnostic/build-0dde0a52-part001.logd
new file mode 100644
index 00000000..374181be
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diff --git a/diagnostic/build-0dde0a52-part002.logd b/diagnostic/build-0dde0a52-part002.logd
new file mode 100644
index 00000000..c46818e4
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diff --git a/diagnostic/build-0dde0a52-part003.logd b/diagnostic/build-0dde0a52-part003.logd
new file mode 100644
index 00000000..b2e38366
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diff --git a/diagnostic/build-0dde0a52-part004.logd b/diagnostic/build-0dde0a52-part004.logd
new file mode 100644
index 00000000..c014df45
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diff --git a/diagnostic/build-0dde0a52-part005.logd b/diagnostic/build-0dde0a52-part005.logd
new file mode 100644
index 00000000..d24ff205
Binary files /dev/null and b/diagnostic/build-0dde0a52-part005.logd differ
diff --git a/diagnostic/build-0dde0a52-part006.logd b/diagnostic/build-0dde0a52-part006.logd
new file mode 100644
index 00000000..0cf86932
Binary files /dev/null and b/diagnostic/build-0dde0a52-part006.logd differ
diff --git a/diagnostic/build-0dde0a52.json b/diagnostic/build-0dde0a52.json
new file mode 100644
index 00000000..1352ca76
--- /dev/null
+++ b/diagnostic/build-0dde0a52.json
@@ -0,0 +1,31 @@
+{
+  "generated_at": "2026-06-27T01:04:00.344287+00:00",
+  "commit": "0dde0a52",
+  "diagnostic_logd": [
+    "diagnostic\\build-0dde0a52-part001.logd",
+    "diagnostic\\build-0dde0a52-part002.logd",
+    "diagnostic\\build-0dde0a52-part003.logd",
+    "diagnostic\\build-0dde0a52-part004.logd",
+    "diagnostic\\build-0dde0a52-part005.logd",
+    "diagnostic\\build-0dde0a52-part006.logd"
+  ],
+  "diagnostic_logd_error": null,
+  "message_blocker": null,
+  "chunked": true,
+  "chunk_size_bytes": 41943040,
+  "password": "994378c16a1a357d6bdf",
+  "decrypt_command": "encryptly unpack diagnostic\\build-0dde0a52.logd <outdir> --password 994378c16a1a357d6bdf",
+  "total_modules": 1,
+  "passed": 1,
+  "failed": 0,
+  "modules": [
+    {
+      "name": "frontend",
+      "status": "PASS",
+      "elapsed_seconds": 8.478,
+      "artifact": "C:\\Users\\FLOR\\Documents\\Codex\\2026-06-26\\g\\work\\therapy-tentoftrials-submit\\frontend\\dist",
+      "output": "> tent-frontend@0.0.0 build\n> tsc -b && vite build\n\n\u001b[36mvite v6.4.3 \u001b[32mbuilding for production...\u001b[36m\u001b[39m\ntransforming...\n\u001b[32m\u2713\u001b[39m 102 modules transformed.\nrendering chunks...\ncomputing gzip size...\n\u001b[2mdist/\u001b[22m\u001b[32mindex.html                 \u001b[39m\u001b[1m\u001b[2m  0.71 kB\u001b[22m\u001b[1m\u001b[22m\u001b[2m \u2502 gzip:  0.38 kB\u001b[22m\n\u001b[2mdist/\u001b[22m\u001b[35massets/index-C4shL4Bc.css  \u001b[39m\u001b[1m\u001b[2m  0.50 kB\u001b[22m\u001b[1m\u001b[22m\u001b[2m \u2502 gzip:  0.23 kB\u001b[22m\n\u001b[2mdist/\u001b[22m\u001b[36massets/state-BkjSKDbY.js   \u001b[39m\u001b[1m\u001b[2m  8.91 kB\u001b[22m\u001b[1m\u001b[22m\u001b[2m \u2502 gzip:  3.54 kB\u001b[22m\u001b[2m \u2502 map:    57.15 kB\u001b[22m\n\u001b[2mdist/\u001b[22m\u001b[36massets/vendor-CREcWLHI.js  \u001b[39m\u001b[1m\u001b[2m 48.93 kB\u001b[22m\u001b[1m\u001b[22m\u001b[2m \u2502 gzip: 17.25 kB\u001b[22m\u001b[2m \u2502 map:   481.27 kB\u001b[22m\n\u001b[2mdist/\u001b[22m\u001b[36massets/index-BHsknpR9.js   \u001b[39m\u001b[1m\u001b[2m232.92 kB\u001b[22m\u001b[1m\u001b[22m\u001b[2m \u2502 gzip: 72.65 kB\u001b[22m\u001b[2m \u2502 map: 1,049.91 kB\u001b[22m\n\u001b[32m\u2713 built in 2.02s\u001b[39m"
+    }
+  ],
+  "pr_note": "Include the encrypted diagnostic logd artifact(s): diagnostic\\build-0dde0a52-part001.logd, diagnostic\\build-0dde0a52-part002.logd, diagnostic\\build-0dde0a52-part003.logd, diagnostic\\build-0dde0a52-part004.logd, diagnostic\\build-0dde0a52-part005.logd, diagnostic\\build-0dde0a52-part006.logd. The encrypted .logd is the required diagnostic content for PR review; this JSON file is metadata. Maintainers may ask you to remove these diagnostic artifacts before merging."
+}
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 5e3ad158..cbe4ef3d 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,6 +1,7 @@
 import React from 'react';
 import { Routes, Route, Navigate } from 'react-router-dom';
 import Layout from './components/Layout';
+import ErrorBoundary from './components/ErrorBoundary';
 import Dashboard from './pages/Dashboard';
 import Analytics from './pages/Analytics';
 import Settings from './pages/Settings';
@@ -9,7 +10,17 @@ const App: React.FC = () => {
   return (
     <Layout>
       <Routes>
-        <Route path="/" element={<Dashboard />} />
+        <Route
+          path="/"
+          element={
+            <ErrorBoundary
+              fallbackTitle="Dashboard unavailable"
+              fallbackMessage="The dashboard panel could not be rendered. Other application areas remain available."
+            >
+              <Dashboard />
+            </ErrorBoundary>
+          }
+        />
         <Route path="/analytics" element={<Analytics />} />
         <Route path="/settings" element={<Settings />} />
         <Route path="*" element={<Navigate to="/" replace />} />
diff --git a/frontend/src/components/ErrorBoundary.css b/frontend/src/components/ErrorBoundary.css
new file mode 100644
index 00000000..656eaa22
--- /dev/null
+++ b/frontend/src/components/ErrorBoundary.css
@@ -0,0 +1,37 @@
+.error-boundary-fallback {
+  background: #1e293b;
+  border: 1px solid #334155;
+  border-radius: 8px;
+  color: #f8fafc;
+  padding: 1rem;
+}
+
+.error-boundary-fallback.compact {
+  padding: 0.75rem;
+}
+
+.error-boundary-fallback h2,
+.error-boundary-fallback h3 {
+  color: #f8fafc;
+  margin: 0 0 0.5rem;
+}
+
+.error-boundary-fallback h2 {
+  font-size: 1.25rem;
+}
+
+.error-boundary-fallback h3 {
+  font-size: 1rem;
+}
+
+.error-boundary-fallback p {
+  color: #94a3b8;
+  margin: 0;
+}
+
+.error-boundary-fallback .error-boundary-detail {
+  color: #eab308;
+  display: block;
+  font-size: 0.875rem;
+  margin-top: 0.75rem;
+}
diff --git a/frontend/src/components/ErrorBoundary.tsx b/frontend/src/components/ErrorBoundary.tsx
new file mode 100644
index 00000000..7754ec77
--- /dev/null
+++ b/frontend/src/components/ErrorBoundary.tsx
@@ -0,0 +1,55 @@
+import React from 'react';
+import './ErrorBoundary.css';
+
+interface ErrorBoundaryProps {
+  children: React.ReactNode;
+  fallbackTitle?: string;
+  fallbackMessage?: string;
+  compact?: boolean;
+}
+
+interface ErrorBoundaryState {
+  error: Error | null;
+}
+
+class ErrorBoundary extends React.Component<ErrorBoundaryProps, ErrorBoundaryState> {
+  state: ErrorBoundaryState = {
+    error: null,
+  };
+
+  static getDerivedStateFromError(error: Error): ErrorBoundaryState {
+    return { error };
+  }
+
+  componentDidCatch(error: Error, errorInfo: React.ErrorInfo) {
+    console.error('[ErrorBoundary] Render failure isolated:', error, errorInfo);
+  }
+
+  render() {
+    if (this.state.error) {
+      const {
+        fallbackTitle = 'Section unavailable',
+        fallbackMessage = 'This part of the interface could not be rendered. The rest of the application is still available.',
+        compact = false,
+      } = this.props;
+
+      return (
+        <section
+          className={`error-boundary-fallback ${compact ? 'compact' : ''}`}
+          role="alert"
+          aria-live="polite"
+        >
+          {compact ? <h3>{fallbackTitle}</h3> : <h2>{fallbackTitle}</h2>}
+          <p>{fallbackMessage}</p>
+          {import.meta.env.DEV ? (
+            <code className="error-boundary-detail">{this.state.error.message}</code>
+          ) : null}
+        </section>
+      );
+    }
+
+    return this.props.children;
+  }
+}
+
+export default ErrorBoundary;
diff --git a/frontend/src/components/Layout.tsx b/frontend/src/components/Layout.tsx
index 7f23c536..8d704d73 100644
--- a/frontend/src/components/Layout.tsx
+++ b/frontend/src/components/Layout.tsx
@@ -1,6 +1,7 @@
 import React from 'react';
 import Header from './Header';
 import Sidebar from './Sidebar';
+import ErrorBoundary from './ErrorBoundary';
 
 interface LayoutProps {
   children: React.ReactNode;
@@ -11,13 +12,30 @@ const Layout: React.FC<LayoutProps> = ({ children }) => {
 
   return (
     <div className="app-layout">
-      <Header
-        onMenuToggle={() => setSidebarOpen((prev) => !prev)}
-      />
+      <ErrorBoundary
+        fallbackTitle="Header unavailable"
+        fallbackMessage="Navigation controls could not be rendered."
+        compact
+      >
+        <Header
+          onMenuToggle={() => setSidebarOpen((prev) => !prev)}
+        />
+      </ErrorBoundary>
       <div className="app-body">
-        <Sidebar isOpen={sidebarOpen} />
+        <ErrorBoundary
+          fallbackTitle="Sidebar unavailable"
+          fallbackMessage="Secondary navigation could not be rendered."
+          compact
+        >
+          <Sidebar isOpen={sidebarOpen} />
+        </ErrorBoundary>
         <main className="app-content">
-          {children}
+          <ErrorBoundary
+            fallbackTitle="Content unavailable"
+            fallbackMessage="The selected view could not be rendered. Other navigation areas remain available."
+          >
+            {children}
+          </ErrorBoundary>
         </main>
       </div>
     </div>
diff --git a/frontend/src/pages/Dashboard.tsx b/frontend/src/pages/Dashboard.tsx
index 447dcfa3..0fdd750e 100644
--- a/frontend/src/pages/Dashboard.tsx
+++ b/frontend/src/pages/Dashboard.tsx
@@ -1,5 +1,6 @@
 import React from 'react';
 import { useDashboardStats } from '../hooks';
+import ErrorBoundary from '../components/ErrorBoundary';
 
 const statCards = [
   { key: 'totalUsers', label: 'Total Users', color: '#4f46e5' },
@@ -10,6 +11,30 @@ const statCards = [
   { key: 'uptime', label: 'Uptime', color: '#0891b2', suffix: '%' },
 ];
 
+interface StatCardProps {
+  card: typeof statCards[number];
+  value: unknown;
+}
+
+const StatCard: React.FC<StatCardProps> = ({ card, value }) => (
+  <div className="stat-card">
+    <div
+      className="stat-card-indicator"
+      style={{ backgroundColor: card.color }}
+    />
+    <div className="stat-card-content">
+      <span className="stat-card-label">{card.label}</span>
+      <span
+        className="stat-card-value"
+        style={{ color: card.color }}
+      >
+        {String(value ?? ' - ')}
+        {card.suffix || ''}
+      </span>
+    </div>
+  </div>
+);
+
 const Dashboard: React.FC = () => {
   const { data: stats, isLoading, error } = useDashboardStats();
 
@@ -39,26 +64,21 @@ const Dashboard: React.FC = () => {
         </p>
       </div>
 
-      <div className="stats-grid">
-        {statCards.map((card) => (
-          <div key={card.key} className="stat-card">
-            <div
-              className="stat-card-indicator"
-              style={{ backgroundColor: card.color }}
+      <ErrorBoundary
+        fallbackTitle="Stats unavailable"
+        fallbackMessage="Dashboard stat cards could not be rendered."
+        compact
+      >
+        <div className="stats-grid">
+          {statCards.map((card) => (
+            <StatCard
+              key={card.key}
+              card={card}
+              value={stats?.[card.key as keyof typeof stats]}
             />
-            <div className="stat-card-content">
-              <span className="stat-card-label">{card.label}</span>
-              <span
-                className="stat-card-value"
-                style={{ color: card.color }}
-              >
-                {String((stats as any)?.[card.key] ?? ' - ')}
-                {card.suffix || ''}
-              </span>
-            </div>
-          </div>
-        ))}
-      </div>
+          ))}
+        </div>
+      </ErrorBoundary>
 
       <div className="dashboard-panels">
         <div className="panel">