diff --git a/web/src/App.vue b/web/src/App.vue
index 688a38d..dc651e1 100644
--- a/web/src/App.vue
+++ b/web/src/App.vue
@@ -1,6 +1,6 @@
 <template>
   <div class="min-h-screen bg-surface font-mono text-text-primary">
-    <nav class="border-b border-surface-border px-6 py-3 flex items-center gap-6">
+    <nav aria-label="Main navigation" class="border-b border-surface-border px-6 py-3 flex items-center gap-6">
       <div class="flex items-center gap-2">
         <span class="text-accent font-semibold tracking-wide">TURNSTONE</span>
         <span class="text-text-dim text-xs">diagnostic intelligence</span>
@@ -11,7 +11,7 @@
           :key="link.to"
           :to="link.to"
           class="px-3 py-1 rounded text-sm text-text-muted hover:text-text-primary hover:bg-surface-raised transition-colors"
-          active-class="text-accent bg-accent-muted"
+          active-class="text-accent bg-accent-muted font-semibold"
         >{{ link.label }}</RouterLink>
       </div>
       <div class="ml-auto flex items-center gap-3">
@@ -25,7 +25,7 @@
           @click="toggleTheme"
           :title="isDark ? 'Switch to light mode' : 'Switch to dark mode'"
           class="text-text-dim hover:text-text-primary transition-colors text-base leading-none px-1"
-          aria-label="Toggle theme"
+          :aria-label="isDark ? 'Switch to light mode' : 'Switch to dark mode'"
         >{{ isDark ? '☀' : '☾' }}</button>
         <StatusDot />
       </div>
diff --git a/web/src/views/DashboardView.vue b/web/src/views/DashboardView.vue
index 672d500..cdaf5c7 100644
--- a/web/src/views/DashboardView.vue
+++ b/web/src/views/DashboardView.vue
@@ -42,16 +42,16 @@
           {{ loading ? '…' : (stats?.errors_24h ?? 0) }}
         </p>
       </div>
-      <div
-        class="rounded border bg-surface-raised p-5 cursor-pointer hover:bg-surface transition-colors"
+      <RouterLink
+        to="/incidents"
+        class="rounded border bg-surface-raised p-5 block hover:bg-surface transition-colors"
         :class="activeIncidents > 0 ? 'border-sev-warn' : 'border-surface-border'"
-        @click="$router.push('/incidents')"
       >
         <p class="text-text-dim text-xs uppercase tracking-widest mb-2">Active Incidents</p>
         <p class="text-3xl font-semibold tabular-nums" :class="activeIncidents > 0 ? 'text-sev-warn' : 'text-text-muted'">
           {{ incidentsLoading ? '…' : activeIncidents }}
         </p>
-      </div>
+      </RouterLink>
     </div>
 
     <!-- Source health (24h) -->
@@ -67,14 +67,15 @@
 
       <div v-else class="rounded border border-surface-border overflow-hidden">
         <table class="w-full text-sm">
+          <caption class="sr-only">Source health — last 24 hours</caption>
           <thead class="bg-surface-raised border-b border-surface-border">
             <tr>
-              <th class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider w-4"></th>
-              <th class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Source</th>
-              <th class="text-right px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Events</th>
-              <th class="text-right px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Errors</th>
-              <th class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Latest</th>
-              <th class="px-4 py-2.5"></th>
+              <th scope="col" class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider w-4"></th>
+              <th scope="col" class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Source</th>
+              <th scope="col" class="text-right px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Events</th>
+              <th scope="col" class="text-right px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Errors</th>
+              <th scope="col" class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Latest</th>
+              <th scope="col" class="px-4 py-2.5"></th>
             </tr>
           </thead>
           <tbody>
@@ -87,6 +88,7 @@
                 <span
                   class="inline-block w-2 h-2 rounded-full"
                   :class="healthDot(src.error_count, src.entry_count)"
+                  aria-hidden="true"
                 ></span>
               </td>
               <td class="px-4 py-2.5 text-accent font-mono text-xs">{{ src.source_id }}</td>
@@ -101,6 +103,7 @@
                 <button
                   class="text-text-dim hover:text-accent text-xs px-2 py-1 rounded hover:bg-surface transition-colors"
                   @click="diagnoseSource(src.source_id)"
+                  :aria-label="`Diagnose ${src.source_id}`"
                 >diagnose</button>
               </td>
             </tr>
diff --git a/web/src/views/DiagnoseView.vue b/web/src/views/DiagnoseView.vue
index 8872260..a7bf4c6 100644
--- a/web/src/views/DiagnoseView.vue
+++ b/web/src/views/DiagnoseView.vue
@@ -9,10 +9,14 @@
     </div>
 
     <!-- Tab toggle -->
-    <div class="flex gap-1 mb-6 border-b border-surface-border">
+    <div role="tablist" aria-label="Diagnose mode" class="flex gap-1 mb-6 border-b border-surface-border">
       <button
         v-for="t in tabs"
         :key="t.key"
+        role="tab"
+        :aria-selected="activeTab === t.key"
+        :id="`tab-${t.key}`"
+        :aria-controls="`tabpanel-${t.key}`"
         @click="activeTab = t.key"
         :class="[
           'px-4 py-2 text-sm transition-colors border-b-2 -mb-px',
@@ -23,11 +27,23 @@
       >{{ t.label }}</button>
     </div>
 
-    <!-- Quick tab -->
-    <QuickCapture v-if="activeTab === 'quick'" />
+    <!-- Quick tab panel -->
+    <div
+      v-if="activeTab === 'quick'"
+      role="tabpanel"
+      id="tabpanel-quick"
+      aria-labelledby="tab-quick"
+    >
+      <QuickCapture />
+    </div>
 
-    <!-- Structured tab -->
-    <template v-else>
+    <!-- Structured tab panel -->
+    <div
+      v-else
+      role="tabpanel"
+      id="tabpanel-structured"
+      aria-labelledby="tab-structured"
+    >
       <IncidentForm @created="onCreated" />
       <div
         v-if="createdLabel"
@@ -36,7 +52,7 @@
         Incident "{{ createdLabel }}" saved —
         <RouterLink to="/incidents" class="underline underline-offset-2">view in Incidents</RouterLink>
       </div>
-    </template>
+    </div>
   </div>
 </template>
 
diff --git a/web/src/views/SettingsView.vue b/web/src/views/SettingsView.vue
index 85f11ea..d5c7fb8 100644
--- a/web/src/views/SettingsView.vue
+++ b/web/src/views/SettingsView.vue
@@ -10,14 +10,16 @@
     <div class="rounded border border-surface-border bg-surface-raised p-5 space-y-6">
       <!-- Entry point -->
       <div>
-        <h2 class="text-text-primary text-sm font-semibold mb-1">Quick Capture Entry Point</h2>
+        <h2 id="entry-point-label" class="text-text-primary text-sm font-semibold mb-1">Quick Capture Entry Point</h2>
         <p class="text-text-dim text-xs mb-3">
           Where the "describe it and search" input appears on every page.
         </p>
-        <div class="flex gap-3">
+        <div role="radiogroup" aria-labelledby="entry-point-label" class="flex gap-3">
           <button
             v-for="opt in entryPointOptions"
             :key="opt.value"
+            role="radio"
+            :aria-checked="prefs.entry_point_style === opt.value"
             @click="setEntryPoint(opt.value as 'topbar' | 'fab')"
             :class="[
               'flex-1 px-4 py-3 rounded border text-sm transition-colors text-left',
@@ -64,12 +66,20 @@
               API Key
               <span class="text-text-dim font-normal">(optional — required for cf-orch remote inference)</span>
             </label>
-            <input
-              v-model="prefs.llm_api_key"
-              type="password"
-              placeholder="Leave blank for local Ollama"
-              class="w-full bg-surface border border-surface-border rounded px-3 py-2 text-sm text-text-primary placeholder-text-dim focus:outline-none focus:border-accent transition-colors"
-            />
+            <div class="relative">
+              <input
+                v-model="prefs.llm_api_key"
+                :type="showApiKey ? 'text' : 'password'"
+                placeholder="Leave blank for local Ollama"
+                class="w-full bg-surface border border-surface-border rounded px-3 py-2 text-sm text-text-primary placeholder-text-dim focus:outline-none focus:border-accent transition-colors"
+              />
+              <button
+                type="button"
+                @click="showApiKey = !showApiKey"
+                :aria-label="showApiKey ? 'Hide API key' : 'Show API key'"
+                class="absolute right-3 top-1/2 -translate-y-1/2 text-text-dim hover:text-text-primary text-xs"
+              >{{ showApiKey ? 'Hide' : 'Show' }}</button>
+            </div>
           </div>
           <button
             @click="saveLlm"
@@ -94,6 +104,9 @@
             class="flex items-start gap-3 rounded border border-surface-border bg-surface p-3"
           >
             <button
+              role="switch"
+              :aria-checked="rule.enabled"
+              :aria-label="`${rule.name || 'Override'} rule enabled`"
               @click="toggleOverride(i)"
               :class="[
                 'mt-0.5 w-9 h-5 rounded-full flex-shrink-0 transition-colors relative',
@@ -112,6 +125,7 @@
             </div>
             <button
               @click="deleteOverride(i)"
+              :aria-label="`Delete override rule: ${rule.name || 'unnamed'}`"
               class="text-text-dim hover:text-sev-error text-xs flex-shrink-0 mt-0.5"
               title="Delete rule"
             >✕</button>
@@ -160,6 +174,8 @@
 
       <p
         v-if="saveStatus"
+        role="status"
+        aria-live="polite"
         class="text-xs"
         :class="saveStatus.ok ? 'text-green-400' : 'text-sev-error'"
       >
@@ -192,6 +208,7 @@ interface Prefs {
 const prefs      = ref<Prefs>({ entry_point_style: 'topbar', llm_url: '', llm_model: '', llm_api_key: '', severity_overrides: [] })
 const saveStatus = ref<{ ok: boolean; msg: string } | null>(null)
 const showAddOverride = ref(false)
+const showApiKey = ref(false)
 const newRule = ref<SeverityOverride>({ name: '', pattern: '', override_severity: 'WARN', enabled: true })
 
 const entryPointOptions = [