diff --git a/src/ui/components/ConditionalBuilder.tsx b/src/ui/components/ConditionalBuilder.tsx
index 92801ae..a3873a1 100644
--- a/src/ui/components/ConditionalBuilder.tsx
+++ b/src/ui/components/ConditionalBuilder.tsx
@@ -52,13 +52,14 @@ export function ConditionalBuilder(props: ConditionalBuilderProps): VNode {
   };
 
   return (
-    <div>
+    <div role="group" aria-label="Conditional rule builder">
       {/* IF row */}
       <div class="wl-conditionalRow" style="display:flex;align-items:center;gap:8px;margin-bottom:8px">
-        <span style="font-weight:700;font-size:12px;min-width:36px">IF</span>
+        <span style="font-weight:700;font-size:12px;min-width:36px" id="wl-cond-if-label">IF</span>
 
         <select
           class="wl-select"
+          aria-labelledby="wl-cond-if-label"
           value={current.field}
           onChange={(e) => update({ field: (e.currentTarget as HTMLSelectElement).value })}
         >
diff --git a/src/ui/components/DataDiffView.tsx b/src/ui/components/DataDiffView.tsx
index 3ad09b1..3b68e10 100644
--- a/src/ui/components/DataDiffView.tsx
+++ b/src/ui/components/DataDiffView.tsx
@@ -46,13 +46,15 @@ export function DataDiffView(props: {
   };
 
   return (
-    <div style="min-width:0;overflow:hidden">
+    <div style="min-width:0;overflow:hidden" role="region" aria-label="Data comparison results">
       <div class="wl-row" style="gap:8px;margin-bottom:8px;align-items:center;flex-wrap:wrap">
-        <div class="wl-chipRow">
+        <div class="wl-chipRow" role="tablist" aria-label="Filter diff results">
           {(['all', 'added', 'removed', 'changed'] as FilterTab[]).map(tab => (
             <button
               key={tab}
               class="wl-chip"
+              role="tab"
+              aria-selected={filter === tab}
               data-active={filter === tab}
               onClick={() => { setFilter(tab); setPage(0); }}
               style={filter === tab ? 'background:var(--wl-accent);color:white' : ''}
diff --git a/src/ui/components/DryRunPanel.tsx b/src/ui/components/DryRunPanel.tsx
index dad8937..5afb11e 100644
--- a/src/ui/components/DryRunPanel.tsx
+++ b/src/ui/components/DryRunPanel.tsx
@@ -39,13 +39,13 @@ export function DryRunPanel(props: {
   }
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="region" aria-label="Dry run results" aria-live="polite">
       <div class="wl-cardHeader">
         <h2>Dry Run {allPass ? '✓' : ''}</h2>
-        <div class="wl-actions">
-          <button class="wl-btn" onClick={exportCsv} disabled={report.total === 0}>Export CSV</button>
-          <button class="wl-btn" onClick={exportJson} disabled={report.total === 0}>Export JSON</button>
-          <button class="wl-btn" onClick={onClose}>Dismiss</button>
+        <div class="wl-actions" role="toolbar" aria-label="Dry run actions">
+          <button class="wl-btn" onClick={exportCsv} disabled={report.total === 0} aria-label="Export dry run report as CSV">Export CSV</button>
+          <button class="wl-btn" onClick={exportJson} disabled={report.total === 0} aria-label="Export dry run report as JSON">Export JSON</button>
+          <button class="wl-btn" onClick={onClose} aria-label="Dismiss dry run panel">Dismiss</button>
         </div>
       </div>
 
diff --git a/src/ui/components/DuplicateGroupView.tsx b/src/ui/components/DuplicateGroupView.tsx
index 2061a08..88f7522 100644
--- a/src/ui/components/DuplicateGroupView.tsx
+++ b/src/ui/components/DuplicateGroupView.tsx
@@ -50,9 +50,9 @@ export function DuplicateGroupView(props: DuplicateGroupViewProps): VNode {
   const indexes = getGroupIndexes(group);
 
   return (
-    <div class="wl-dupGroup">
+    <div class="wl-dupGroup" role="region" aria-label={`Duplicate group ${group.masterIndex} resolution`}>
       <div class="wl-tableWrap">
-        <table class="wl-dupGroupTable">
+        <table class="wl-dupGroupTable" aria-label="Field-level merge selection table">
           <thead>
             <tr>
               <th style="padding:4px 8px;border-bottom:1px solid var(--wl-line-2);font-size:11px;text-transform:uppercase;letter-spacing:0.5px;color:var(--wl-ink-dim)">
diff --git a/src/ui/components/FieldAnalyticsChart.tsx b/src/ui/components/FieldAnalyticsChart.tsx
index f9b5e1a..c405931 100644
--- a/src/ui/components/FieldAnalyticsChart.tsx
+++ b/src/ui/components/FieldAnalyticsChart.tsx
@@ -27,9 +27,9 @@ export function FieldAnalyticsChart(props: FieldAnalyticsChartProps): VNode {
   }
 
   return (
-    <div class="wl-analyticsChart">
+    <div class="wl-analyticsChart" role="img" aria-label={`Field analytics chart showing ${metrics.length} fields`}>
       {/* Header row */}
-      <div class="wl-analyticsRow" style="font-weight:900;font-size:11px;text-transform:uppercase;letter-spacing:0.5px;color:var(--wl-ink-dim)">
+      <div class="wl-analyticsRow" style="font-weight:900;font-size:11px;text-transform:uppercase;letter-spacing:0.5px;color:var(--wl-ink-dim)" aria-hidden="true">
         <span>Field</span>
         <span>Population Rate</span>
         <span style="text-align:right">%</span>
diff --git a/src/ui/components/FieldDiffDetail.tsx b/src/ui/components/FieldDiffDetail.tsx
index 09235d5..1ea8d82 100644
--- a/src/ui/components/FieldDiffDetail.tsx
+++ b/src/ui/components/FieldDiffDetail.tsx
@@ -20,12 +20,12 @@ export function FieldDiffDetail(props: FieldDiffDetailProps): VNode {
   const { diff } = props;
 
   return (
-    <div class="wl-diffRow" data-status={diff.status}>
+    <div class="wl-diffRow" data-status={diff.status} role="listitem" aria-label={`Field ${diff.name}: ${diff.status}`}>
       <span class="wl-mono" style="font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap" title={diff.name}>
         {diff.name}
       </span>
 
-      <span class="wl-diffBadge" data-status={diff.status}>
+      <span class="wl-diffBadge" data-status={diff.status} aria-label={`Status: ${diff.status}`}>
         {diff.status}
       </span>
 
diff --git a/src/ui/components/FieldGeneratorConfig.tsx b/src/ui/components/FieldGeneratorConfig.tsx
index 07e3a50..473e0c4 100644
--- a/src/ui/components/FieldGeneratorConfig.tsx
+++ b/src/ui/components/FieldGeneratorConfig.tsx
@@ -26,7 +26,7 @@ export function FieldGeneratorConfig(props: FieldGeneratorConfigProps): VNode {
   }
 
   return (
-    <div class="wl-fieldConfigRow">
+    <div class="wl-fieldConfigRow" role="group" aria-label={`Generator config for ${config.fieldName}`}>
       <div style="display:flex;flex-direction:column;gap:2px;min-width:0">
         <span class="wl-mono" style="font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap" title={config.fieldName}>
           {config.fieldName}
diff --git a/src/ui/components/FieldRecommendations.tsx b/src/ui/components/FieldRecommendations.tsx
index 166f6d7..8505dbf 100644
--- a/src/ui/components/FieldRecommendations.tsx
+++ b/src/ui/components/FieldRecommendations.tsx
@@ -27,7 +27,7 @@ export function FieldRecommendations(props: FieldRecommendationsProps): VNode {
   }
 
   return (
-    <ul class="wl-recommendations">
+    <ul class="wl-recommendations" role="list" aria-label="Field quality recommendations">
       {recommendations.map((rec, i) => (
         <li key={i}>{rec}</li>
       ))}
diff --git a/src/ui/components/MergeWizard.tsx b/src/ui/components/MergeWizard.tsx
index 80c63cf..425ce25 100644
--- a/src/ui/components/MergeWizard.tsx
+++ b/src/ui/components/MergeWizard.tsx
@@ -133,14 +133,17 @@ export function MergeWizard(props: MergeWizardProps): VNode {
   }
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="region" aria-label="Merge wizard">
       <div class="wl-cardHeader">
         <h2>Merge Wizard</h2>
-        <div class="wl-actions">
+        <div class="wl-actions" role="tablist" aria-label="Wizard steps">
           {STEPS.map((label, i) => (
             <span
               key={label}
               class="wl-chip"
+              role="tab"
+              aria-selected={i === step}
+              aria-current={i === step ? 'step' : undefined}
               style={i === step ? 'border-color:var(--wl-accent);font-weight:900' : ''}
             >
               {i + 1}. {label}
diff --git a/src/ui/components/MigrationProgressDashboard.tsx b/src/ui/components/MigrationProgressDashboard.tsx
index 7ff70e4..ecdbd9b 100644
--- a/src/ui/components/MigrationProgressDashboard.tsx
+++ b/src/ui/components/MigrationProgressDashboard.tsx
@@ -42,13 +42,14 @@ export function MigrationProgressDashboard(props: {
   const barColor = status === 'error' ? 'var(--wl-danger)' : progress.done ? 'var(--wl-success)' : 'var(--wl-accent)';
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="region" aria-label="Migration progress dashboard" aria-live="polite">
       <div class="wl-cardHeader">
         <h2>Migration Progress</h2>
         <div style="display:flex;align-items:center;gap:10px">
           <span
             class="wl-pill"
             style={`color:${badge.color};border-color:${badge.color}55`}
+            aria-label={`Status: ${badge.label}`}
           >
             {badge.label}
           </span>
diff --git a/src/ui/components/OrgPicker.tsx b/src/ui/components/OrgPicker.tsx
index 78f522c..882f56b 100644
--- a/src/ui/components/OrgPicker.tsx
+++ b/src/ui/components/OrgPicker.tsx
@@ -22,7 +22,7 @@ export function OrgPicker(props: {
   }
 
   return (
-    <div class="wl-orgPicker">
+    <div class="wl-orgPicker" role="group" aria-label="Organization picker for data comparison">
       <div style="flex:1">
         <label htmlFor="compare-source-org" class="wl-muted" style="font-size:11px;font-weight:700;text-transform:uppercase;display:block;margin-bottom:4px">Source Org</label>
         <select
diff --git a/src/ui/components/QualityRuleEditor.tsx b/src/ui/components/QualityRuleEditor.tsx
index 68444f9..a94d2e4 100644
--- a/src/ui/components/QualityRuleEditor.tsx
+++ b/src/ui/components/QualityRuleEditor.tsx
@@ -177,7 +177,7 @@ export function QualityRuleEditor(props: QualityRuleEditorProps): VNode {
   }
 
   return (
-    <div class="wl-card" style="display:flex;flex-direction:column;gap:12px">
+    <div class="wl-card" style="display:flex;flex-direction:column;gap:12px" role="region" aria-label="Quality rules editor">
       <div class="wl-cardHeader">
         <h2>Quality Rules</h2>
         <span class="wl-muted">{rules.length} rule{rules.length !== 1 ? 's' : ''}</span>
@@ -193,6 +193,8 @@ export function QualityRuleEditor(props: QualityRuleEditorProps): VNode {
         <div
           key={rule.id}
           class="wl-card"
+          role="listitem"
+          aria-label={`Quality rule ${index + 1}: ${rule.field || 'unconfigured'}`}
           style="padding:12px;display:flex;flex-direction:column;gap:10px;border:1px solid var(--wl-line-2);border-radius:8px"
         >
           <div style="display:flex;gap:8px;align-items:center;flex-wrap:wrap">
diff --git a/src/ui/components/QualityScorecard.tsx b/src/ui/components/QualityScorecard.tsx
index 79d5d01..36dc11f 100644
--- a/src/ui/components/QualityScorecard.tsx
+++ b/src/ui/components/QualityScorecard.tsx
@@ -40,13 +40,13 @@ export function QualityScorecard(props: QualityScorecardProps): VNode {
   breakdowns.sort((a, b) => a.passRate - b.passRate);
 
   return (
-    <div class="wl-card" style="display:flex;flex-direction:column;gap:16px">
+    <div class="wl-card" style="display:flex;flex-direction:column;gap:16px" role="region" aria-label="Data quality scorecard">
       <div class="wl-cardHeader">
         <h2>Quality Scorecard</h2>
       </div>
 
       {/* Score badge */}
-      <div style="display:flex;align-items:center;justify-content:center;padding:16px 0">
+      <div style="display:flex;align-items:center;justify-content:center;padding:16px 0" role="img" aria-label={`Overall quality score: ${result.score} out of 100`}>
         <div
           style={`
             width:100px;height:100px;border-radius:50%;
diff --git a/src/ui/components/QueryExplainPanel.tsx b/src/ui/components/QueryExplainPanel.tsx
index f5c6acb..86f724b 100644
--- a/src/ui/components/QueryExplainPanel.tsx
+++ b/src/ui/components/QueryExplainPanel.tsx
@@ -49,11 +49,11 @@ export function QueryExplainPanel(props: {
   }
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="region" aria-label="Query explain plan">
       <div class="wl-cardHeader">
         <h2>Explain Plan</h2>
-        <div class="wl-actions">
-          <button class="wl-btn wl-btnPrimary" style="font-size:11px;padding:5px 14px" onClick={runExplain} disabled={loading || !soql.trim()}>
+        <div class="wl-actions" role="toolbar" aria-label="Explain plan actions">
+          <button class="wl-btn wl-btnPrimary" style="font-size:11px;padding:5px 14px" onClick={runExplain} disabled={loading || !soql.trim()} aria-label="Analyze SOQL query execution plan">
             {loading ? 'Analyzing...' : 'Analyze'}
           </button>
         </div>
diff --git a/src/ui/components/QueryMetricsPanel.tsx b/src/ui/components/QueryMetricsPanel.tsx
index dfc03dd..7ab3bf5 100644
--- a/src/ui/components/QueryMetricsPanel.tsx
+++ b/src/ui/components/QueryMetricsPanel.tsx
@@ -36,16 +36,16 @@ export function QueryMetricsPanel(props: QueryMetricsPanelProps): VNode {
   const displayed = viewAll ? sorted : sorted.slice(0, 5);
 
   return (
-    <div class="wl-card" style="display:flex;flex-direction:column;gap:10px">
+    <div class="wl-card" style="display:flex;flex-direction:column;gap:10px" role="region" aria-label="Query metrics panel">
       <div class="wl-cardHeader">
         <h2>Query Metrics</h2>
-        <div class="wl-actions">
+        <div class="wl-actions" role="toolbar" aria-label="Query metrics actions">
           {metrics.length > 5 ? (
-            <button class="wl-btn" onClick={() => setViewAll(!viewAll)}>
+            <button class="wl-btn" onClick={() => setViewAll(!viewAll)} aria-expanded={viewAll} aria-label={viewAll ? 'Show recent queries only' : `View all ${metrics.length} queries`}>
               {viewAll ? 'Show Recent' : `View All (${metrics.length})`}
             </button>
           ) : null}
-          <button class="wl-btn" onClick={onClear} disabled={metrics.length === 0}>
+          <button class="wl-btn" onClick={onClear} disabled={metrics.length === 0} aria-label="Clear query metrics">
             Clear
           </button>
         </div>
diff --git a/src/ui/components/RelationshipConfig.tsx b/src/ui/components/RelationshipConfig.tsx
index ac4eac6..0774bb6 100644
--- a/src/ui/components/RelationshipConfig.tsx
+++ b/src/ui/components/RelationshipConfig.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Configuration component for lookup relationship fields.
  *
  * Provides a textarea for entering lookup record IDs (one per line)
@@ -41,8 +41,7 @@ export function RelationshipConfig(props: RelationshipConfigProps): VNode {
         </span>
       </div>
 
-      <textarea
-        class="wl-textarea"
+      <textarea class="wl-textarea" aria-label={`Lookup record IDs for ${fieldName}`}
         style="min-height:80px;font-size:12px"
         placeholder={"Enter lookup record IDs (one per line):\n001xx000003abc1\n001xx000003abc2\n001xx000003abc3"}
         value={lookupValues.join('\n')}
@@ -57,3 +56,4 @@ export function RelationshipConfig(props: RelationshipConfigProps): VNode {
     </div>
   );
 }
+
diff --git a/src/ui/components/RelationshipTree.tsx b/src/ui/components/RelationshipTree.tsx
index f0e5391..c808a13 100644
--- a/src/ui/components/RelationshipTree.tsx
+++ b/src/ui/components/RelationshipTree.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Tree of objects with checkboxes and edge labels for the clone wizard.
  *
  * What this file does:
@@ -69,7 +69,7 @@ export function RelationshipTree(props: RelationshipTreeProps): VNode {
   }, [graph.edges]);
 
   return (
-    <div class="wl-relationshipTree">
+    <div class="wl-relationshipTree" role="tree" aria-label="Object relationship tree">
       {nodeNames.length === 0 && (
         <div class="wl-muted" style="padding:8px">
           No objects in the relationship graph.
@@ -85,11 +85,7 @@ export function RelationshipTree(props: RelationshipTreeProps): VNode {
             {/* Node */}
             <div class="wl-relNode" data-cycle={inCycle ? 'true' : undefined}>
               <label style="display:flex;align-items:center;gap:8px;cursor:pointer;flex:1">
-                <input
-                  type="checkbox"
-                  checked={selectedObjects.has(name)}
-                  onChange={() => onToggleObject(name)}
-                  style="accent-color:var(--wl-accent)"
+                <input type="checkbox" checked={selectedObjects.has(name)} onChange={() => onToggleObject(name)} style="accent-color:var(--wl-accent)" aria-label={`Select ${name} for cloning`}
                 />
                 <span style="font-weight:700;font-size:13px">{name}</span>
               </label>
@@ -129,3 +125,4 @@ export function RelationshipTree(props: RelationshipTreeProps): VNode {
     </div>
   );
 }
+
diff --git a/src/ui/components/SchemaDiffView.tsx b/src/ui/components/SchemaDiffView.tsx
index 6d16a8a..766a8c2 100644
--- a/src/ui/components/SchemaDiffView.tsx
+++ b/src/ui/components/SchemaDiffView.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Scrollable list view of schema diffs with filter toolbar and summary stats.
  *
  * Renders a toolbar with all/added/removed/changed toggle buttons,
@@ -48,7 +48,7 @@ export function SchemaDiffView(props: SchemaDiffViewProps): VNode {
   ];
 
   return (
-    <div class="wl-diffView">
+    <div class="wl-diffView" role="region" aria-label="Schema diff results">
       {/* Summary stats */}
       <div class="wl-chipRow" style="padding:8px 0">
         <span class="wl-chip">
@@ -66,7 +66,7 @@ export function SchemaDiffView(props: SchemaDiffViewProps): VNode {
           <button
             key={f.mode}
             class="wl-btn"
-            data-active={filter === f.mode ? 'true' : 'false'}
+            data-active={filter === f.mode ? 'true' : 'false'} aria-pressed={filter === f.mode}
             onClick={() => setFilter(f.mode)}
             style="font-size:11px;padding:5px 10px"
           >
@@ -76,7 +76,7 @@ export function SchemaDiffView(props: SchemaDiffViewProps): VNode {
       </div>
 
       {/* Diff list */}
-      <div style="max-height:520px;overflow-y:auto">
+      <div style="max-height:520px;overflow-y:auto" aria-live="polite">
         {visibleDiffs.length > 0 ? (
           visibleDiffs.map((d) => (
             <FieldDiffDetail key={d.name} diff={d} />
@@ -88,3 +88,4 @@ export function SchemaDiffView(props: SchemaDiffViewProps): VNode {
     </div>
   );
 }
+
diff --git a/src/ui/components/ShortcutEditor.tsx b/src/ui/components/ShortcutEditor.tsx
index d9f5a8a..32d8b4f 100644
--- a/src/ui/components/ShortcutEditor.tsx
+++ b/src/ui/components/ShortcutEditor.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Keyboard shortcut editor component.
  *
  * Displays a table of all registered shortcuts with their default and current
@@ -92,10 +92,10 @@ export function ShortcutEditor(props: { sf: SfApi }): VNode {
   };
 
   return (
-    <div class="wl-shortcutEditor">
+    <div class="wl-shortcutEditor" role="region" aria-label="Keyboard shortcut editor">
       <h3>Keyboard Shortcuts</h3>
       {error && <div class="wl-shortcutError">{error}</div>}
-      <table class="wl-shortcutTable">
+      <table class="wl-shortcutTable" aria-label="Keyboard shortcuts">
         <thead>
           <tr>
             <th>Description</th>
@@ -119,7 +119,7 @@ export function ShortcutEditor(props: { sf: SfApi }): VNode {
                   {isCapturing ? (
                     <input
                       class="wl-input wl-shortcutCapture"
-                      placeholder="Press keys..."
+                      placeholder="Press keys..." aria-label="Press new keyboard shortcut"
                       readOnly
                       autoFocus
                       onKeyDown={handleCaptureKeydown}
@@ -131,11 +131,11 @@ export function ShortcutEditor(props: { sf: SfApi }): VNode {
                 </td>
                 <td>
                   {isCapturing ? (
-                    <button class="wl-btn" onClick={cancelCapture}>
+                    <button class="wl-btn" onClick={cancelCapture} aria-label="Cancel shortcut capture">
                       Cancel
                     </button>
                   ) : (
-                    <button class="wl-btn" onClick={() => startCapture(def.id)}>
+                    <button class="wl-btn" onClick={() => startCapture(def.id)} aria-label={`Edit shortcut for ${def.description}`}>
                       Edit
                     </button>
                   )}
@@ -148,3 +148,4 @@ export function ShortcutEditor(props: { sf: SfApi }): VNode {
     </div>
   );
 }
+
diff --git a/src/ui/components/Skeleton.tsx b/src/ui/components/Skeleton.tsx
index 7183523..6ed19ee 100644
--- a/src/ui/components/Skeleton.tsx
+++ b/src/ui/components/Skeleton.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Reusable skeleton placeholder component for loading states.
  *
  * Replaces plain "Loading..." text with animated shimmer placeholders
@@ -30,7 +30,7 @@ export function Skeleton(props: SkeletonProps): VNode {
 
   if (variant === 'card') {
     return (
-      <div class="wl-skeleton--card">
+      <div class="wl-skeleton--card" role="status" aria-label="Loading content">
         <SkeletonLine width="60%" />
         <SkeletonLine width="100%" />
         <SkeletonLine width="80%" />
@@ -40,7 +40,7 @@ export function Skeleton(props: SkeletonProps): VNode {
 
   if (variant === 'chip') {
     return (
-      <div class="wl-skeleton--chipRow">
+      <div class="wl-skeleton--chipRow" role="status" aria-label="Loading content">
         <div class="wl-skeleton wl-skeleton--chip" />
         <div class="wl-skeleton wl-skeleton--chip" />
         <div class="wl-skeleton wl-skeleton--chip" />
@@ -50,7 +50,7 @@ export function Skeleton(props: SkeletonProps): VNode {
 
   if (variant === 'table') {
     return (
-      <div class="wl-skeleton--table">
+      <div class="wl-skeleton--table" role="status" aria-label="Loading content">
         <div class="wl-skeleton--tableRow">
           {Array.from({ length: columns }, (_, i) => (
             <div key={i} class="wl-skeleton wl-skeleton--tableHead" />
@@ -70,10 +70,11 @@ export function Skeleton(props: SkeletonProps): VNode {
   // Default: text lines with varying widths
   const widths = ['100%', '85%', '70%', '90%', '60%'];
   return (
-    <div class="wl-skeleton--textGroup">
+    <div class="wl-skeleton--textGroup" role="status" aria-label="Loading content">
       {Array.from({ length: rows }, (_, i) => (
         <SkeletonLine key={i} width={widths[i % widths.length]} />
       ))}
     </div>
   );
 }
+
diff --git a/src/ui/components/StepConfigPanel.tsx b/src/ui/components/StepConfigPanel.tsx
index 98fc4b0..9bb5b39 100644
--- a/src/ui/components/StepConfigPanel.tsx
+++ b/src/ui/components/StepConfigPanel.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Configuration form panel for a single pipeline step.
  *
  * What this file does:
@@ -353,12 +353,12 @@ export function StepConfigPanel(props: StepConfigPanelProps): VNode {
   }
 
   return (
-    <div class="wl-configPanel">
+    <div class="wl-configPanel" role="form" aria-label={`Configure ${step.type} step`}>
       <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:12px">
         <div style="font-weight:900;font-size:13px">
           Configure: {step.type}
         </div>
-        <button class="wl-btn wl-btnDanger" style="font-size:11px" onClick={onRemove}>
+        <button class="wl-btn wl-btnDanger" style="font-size:11px" onClick={onRemove} aria-label={`Remove ${step.type} step`}>
           Remove Step
         </button>
       </div>
@@ -380,4 +380,4 @@ export function StepConfigPanel(props: StepConfigPanelProps): VNode {
       {step.type === 'join' && <JoinConfig step={step} onChange={onChange} />}
     </div>
   );
-}
\ No newline at end of file
+}
diff --git a/src/ui/components/TemplateCard.tsx b/src/ui/components/TemplateCard.tsx
index 303a00b..cd2bc99 100644
--- a/src/ui/components/TemplateCard.tsx
+++ b/src/ui/components/TemplateCard.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Card component for displaying a saved data template.
  *
  * Renders the template name, object badge, category, usage count,
@@ -33,7 +33,7 @@ export function TemplateCard(props: TemplateCardProps): VNode {
   const { template, onEdit, onDelete, onUse } = props;
 
   return (
-    <div class="wl-templateCard">
+    <div class="wl-templateCard" role="article" aria-label={`Template: ${template.name}`}>
       <div class="wl-templateCardTitle">{template.name}</div>
 
       <div style="display:flex;flex-wrap:wrap;gap:6px;align-items:center">
@@ -56,10 +56,11 @@ export function TemplateCard(props: TemplateCardProps): VNode {
       </div>
 
       <div class="wl-actions" style="margin-top:auto;padding-top:4px">
-        <button class="wl-btn" onClick={onEdit} style="font-size:11px;padding:5px 8px">Edit</button>
-        <button class="wl-btn wl-btnDanger" onClick={onDelete} style="font-size:11px;padding:5px 8px">Delete</button>
-        <button class="wl-btn wl-btnPrimary" onClick={onUse} style="font-size:11px;padding:5px 8px">Use</button>
+        <button class="wl-btn" onClick={onEdit} style="font-size:11px;padding:5px 8px" aria-label={`Edit template ${template.name}`}>Edit</button>
+        <button class="wl-btn wl-btnDanger" onClick={onDelete} style="font-size:11px;padding:5px 8px" aria-label={`Delete template ${template.name}`}>Delete</button>
+        <button class="wl-btn wl-btnPrimary" onClick={onUse} style="font-size:11px;padding:5px 8px" aria-label={`Use template ${template.name}`}>Use</button>
       </div>
     </div>
   );
 }
+
diff --git a/src/ui/components/TemplateEditor.tsx b/src/ui/components/TemplateEditor.tsx
index 5a56f08..3548769 100644
--- a/src/ui/components/TemplateEditor.tsx
+++ b/src/ui/components/TemplateEditor.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Form component for creating or editing a DataTemplate.
  *
  * Provides text inputs for name, description, objectName, and category,
@@ -74,10 +74,10 @@ export function TemplateEditor(props: TemplateEditorProps): VNode {
   const canSave = name.trim().length > 0 && objectName.trim().length > 0;
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="form" aria-label="Template editor">
       <div class="wl-cardHeader">
         <h2>{template ? 'Edit Template' : 'New Template'}</h2>
-        <button class="wl-btn" onClick={onCancel}>Cancel</button>
+        <button class="wl-btn" onClick={onCancel} aria-label="Cancel template editing">Cancel</button>
       </div>
 
       <div class="wl-row">
@@ -151,8 +151,8 @@ export function TemplateEditor(props: TemplateEditorProps): VNode {
         </div>
 
         <div class="wl-actions" style="justify-content:flex-end;padding-top:8px;border-top:1px solid var(--wl-line-2)">
-          <button class="wl-btn" onClick={onCancel}>Cancel</button>
-          <button class="wl-btn wl-btnPrimary" onClick={handleSave} disabled={!canSave}>
+          <button class="wl-btn" onClick={onCancel} aria-label="Cancel template editing">Cancel</button>
+          <button class="wl-btn wl-btnPrimary" onClick={handleSave} disabled={!canSave} aria-label={template ? 'Save template changes' : 'Create new template'}>
             {template ? 'Save Changes' : 'Create Template'}
           </button>
         </div>
@@ -160,3 +160,4 @@ export function TemplateEditor(props: TemplateEditorProps): VNode {
     </div>
   );
 }
+
diff --git a/src/ui/components/UndoHistoryPanel.tsx b/src/ui/components/UndoHistoryPanel.tsx
index 6347f57..e9c44ee 100644
--- a/src/ui/components/UndoHistoryPanel.tsx
+++ b/src/ui/components/UndoHistoryPanel.tsx
@@ -1,4 +1,4 @@
-/**
+/**
  * Fixed bottom-right overlay panel for viewing and undoing push transactions.
  *
  * What this file does:
@@ -98,14 +98,14 @@ export function UndoHistoryPanel(props: UndoHistoryPanelProps): VNode {
   if (!open) return h('div', null) as VNode;
 
   return (
-    <div class="wl-undoPanel" style="position:fixed;bottom:16px;right:16px;width:380px;z-index:1000">
+    <div class="wl-undoPanel" role="dialog" aria-label="Undo history panel" style="position:fixed;bottom:16px;right:16px;width:380px;z-index:1000">
       <div class="wl-undoPanelHeader">
         <span>Undo History</span>
         <div class="wl-actions">
-          <button class="wl-btn" onClick={loadTransactions} style="padding:4px 8px;font-size:11px">
+          <button class="wl-btn" onClick={loadTransactions} style="padding:4px 8px;font-size:11px" aria-label="Refresh undo history">
             Refresh
           </button>
-          <button class="wl-btn" onClick={onClose} style="padding:4px 8px;font-size:11px">
+          <button class="wl-btn" onClick={onClose} style="padding:4px 8px;font-size:11px" aria-label="Close undo history panel">
             Close
           </button>
         </div>
@@ -139,16 +139,14 @@ export function UndoHistoryPanel(props: UndoHistoryPanelProps): VNode {
                   <button
                     class="wl-btn wl-btnPrimary"
                     style="padding:4px 8px;font-size:11px"
-                    onClick={() => handleUndo(t)}
-                    disabled={expired || isBusy}
+                    onClick={() => handleUndo(t)} disabled={expired || isBusy} aria-label={`Undo ${t.objectName} ${t.operation}`}
                   >
                     {isBusy ? '...' : 'Undo'}
                   </button>
                   <button
                     class="wl-btn wl-btnDanger"
                     style="padding:4px 8px;font-size:11px"
-                    onClick={() => handleRemove(t)}
-                    disabled={isBusy}
+                    onClick={() => handleRemove(t)} disabled={isBusy} aria-label={`Remove ${t.objectName} transaction from history`}
                   >
                     Remove
                   </button>
@@ -161,3 +159,4 @@ export function UndoHistoryPanel(props: UndoHistoryPanelProps): VNode {
     </div>
   );
 }
+
diff --git a/src/ui/components/cleanser/BulkActions.tsx b/src/ui/components/cleanser/BulkActions.tsx
index 29c9798..11fbd42 100644
--- a/src/ui/components/cleanser/BulkActions.tsx
+++ b/src/ui/components/cleanser/BulkActions.tsx
@@ -26,24 +26,25 @@ export function BulkActions(props: {
   const [suffix, setSuffix] = useState('');
 
   return (
-    <div class="wl-bulkBar">
-      <div style="font-weight:900">{selectedCount} selected</div>
+    <div class="wl-bulkBar" role="toolbar" aria-label="Bulk actions for selected columns">
+      <div style="font-weight:900" aria-live="polite">{selectedCount} selected</div>
       <div class="wl-muted">({filteredCount} filtered)</div>
       <div style="flex:1" />
 
-      <select class="wl-select" style="max-width:220px" onChange={(e) => onSetTransform((e.currentTarget as HTMLSelectElement).value as TransformationType)}>
+      <select class="wl-select" style="max-width:220px" aria-label="Set transform for selected columns" onChange={(e) => onSetTransform((e.currentTarget as HTMLSelectElement).value as TransformationType)}>
         <option value="">Set transform...</option>
         {TRANSFORM_OPTIONS.map(t => <option key={t.key} value={t.key}>{t.label}</option>)}
       </select>
 
-      <button class="wl-btn" onClick={() => onDrop(true)}>Drop</button>
-      <button class="wl-btn" onClick={() => onDrop(false)}>Undrop</button>
-      <button class="wl-btn wl-btnDanger" onClick={onReset}>Reset</button>
+      <button class="wl-btn" onClick={() => onDrop(true)} aria-label="Drop selected columns">Drop</button>
+      <button class="wl-btn" onClick={() => onDrop(false)} aria-label="Undrop selected columns">Undrop</button>
+      <button class="wl-btn wl-btnDanger" onClick={onReset} aria-label="Reset all bulk actions">Reset</button>
 
       <input
         class="wl-input"
         style="max-width:140px"
         placeholder="Prefix"
+        aria-label="Rename prefix"
         value={prefix}
         onInput={(e) => setPrefix((e.currentTarget as HTMLInputElement).value)}
       />
@@ -51,10 +52,11 @@ export function BulkActions(props: {
         class="wl-input"
         style="max-width:140px"
         placeholder="Suffix"
+        aria-label="Rename suffix"
         value={suffix}
         onInput={(e) => setSuffix((e.currentTarget as HTMLInputElement).value)}
       />
-      <button class="wl-btn" onClick={() => onRenameAffix(prefix, suffix)}>Rename</button>
+      <button class="wl-btn" onClick={() => onRenameAffix(prefix, suffix)} aria-label="Apply rename with prefix and suffix">Rename</button>
     </div>
   );
 }
diff --git a/src/ui/components/cleanser/ColumnEditor.tsx b/src/ui/components/cleanser/ColumnEditor.tsx
index 9cec16f..705c61a 100644
--- a/src/ui/components/cleanser/ColumnEditor.tsx
+++ b/src/ui/components/cleanser/ColumnEditor.tsx
@@ -35,7 +35,7 @@ export function ColumnEditor(props: {
   });
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="region" aria-label={`Column editor for ${op.source}`}>
       <div class="wl-cardHeader">
         <div style="display:flex;align-items:baseline;gap:10px;min-width:0">
           <h2 style="margin:0">Column</h2>
diff --git a/src/ui/components/cleanser/DatasetHeader.tsx b/src/ui/components/cleanser/DatasetHeader.tsx
index 99f5f8f..dd2c56f 100644
--- a/src/ui/components/cleanser/DatasetHeader.tsx
+++ b/src/ui/components/cleanser/DatasetHeader.tsx
@@ -43,27 +43,28 @@ export function DatasetHeader(props: {
   const sizeText = dataset?.bytes ? `${Math.round(dataset.bytes / 1024)} KB` : '';
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="region" aria-label="Data Cleanser header">
       <div class="wl-cardHeader">
         <h2>Data Cleanser</h2>
-        <div class="wl-actions">
+        <div class="wl-actions" role="toolbar" aria-label="Dataset actions">
           <label class="wl-btn">
             {dataset ? 'Replace File' : 'Upload CSV/JSON'}
             <input
               type="file"
               accept=".csv,.json"
               style="display:none"
+              aria-label={dataset ? 'Replace dataset file' : 'Upload CSV or JSON file'}
               onChange={(e) => {
                 const f = (e.currentTarget as HTMLInputElement).files?.[0];
                 if (f) onUpload(f);
               }}
             />
           </label>
-          <button class="wl-btn wl-btnDanger" onClick={onClear} disabled={!dataset}>Clear</button>
-          <button class="wl-btn wl-btnPrimary" onClick={onApply} disabled={!canApply}>Apply</button>
-          <button class="wl-btn" onClick={onExportCsv} disabled={!hasSnapshot && !canApply}>Export CSV</button>
-          <button class="wl-btn" onClick={onExportJson} disabled={!hasSnapshot && !canApply}>Export JSON</button>
-          <button class="wl-btn wl-btnPrimary" onClick={onGoToPush} disabled={!hasSnapshot}>Send to Data Push</button>
+          <button class="wl-btn wl-btnDanger" onClick={onClear} disabled={!dataset} aria-label="Clear current dataset">Clear</button>
+          <button class="wl-btn wl-btnPrimary" onClick={onApply} disabled={!canApply} aria-label="Apply cleanser changes">Apply</button>
+          <button class="wl-btn" onClick={onExportCsv} disabled={!hasSnapshot && !canApply} aria-label="Export dataset as CSV">Export CSV</button>
+          <button class="wl-btn" onClick={onExportJson} disabled={!hasSnapshot && !canApply} aria-label="Export dataset as JSON">Export JSON</button>
+          <button class="wl-btn wl-btnPrimary" onClick={onGoToPush} disabled={!hasSnapshot} aria-label="Send dataset to Data Push">Send to Data Push</button>
         </div>
       </div>
 
diff --git a/src/ui/components/cleanser/PreviewGrid.tsx b/src/ui/components/cleanser/PreviewGrid.tsx
index a61e6c8..dc46983 100644
--- a/src/ui/components/cleanser/PreviewGrid.tsx
+++ b/src/ui/components/cleanser/PreviewGrid.tsx
@@ -15,13 +15,13 @@ export function PreviewGrid(props: {
   const { headers, rows, note } = props;
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="region" aria-label="Data preview">
       <div class="wl-cardHeader">
         <h2>Preview (first 100 rows)</h2>
         <div class="wl-muted">{note ?? 'Preview reflects staged changes; Apply computes full cleaned dataset.'}</div>
       </div>
       <div class="wl-tableWrap">
-        <table class="wl-table">
+        <table class="wl-table" aria-label="Preview data table">
           <thead>
             <tr>
               {headers.map(h => <th key={h}>{h}</th>)}
diff --git a/src/ui/components/cleanser/ValidationPanel.tsx b/src/ui/components/cleanser/ValidationPanel.tsx
index 3afbed0..4870dc8 100644
--- a/src/ui/components/cleanser/ValidationPanel.tsx
+++ b/src/ui/components/cleanser/ValidationPanel.tsx
@@ -75,15 +75,15 @@ export function ValidationPanel(props: {
   }, [errors]);
 
   return (
-    <div class="wl-card">
+    <div class="wl-card" role="region" aria-label="Data validation panel">
       <div class="wl-cardHeader">
         <h2>Validation</h2>
-        <div class="wl-actions">
+        <div class="wl-actions" role="toolbar" aria-label="Validation controls">
           <label class="wl-chip" style="cursor:pointer">
-            <input type="checkbox" checked={enabled} onChange={(e) => onEnabledChange((e.currentTarget as HTMLInputElement).checked)} />
+            <input type="checkbox" checked={enabled} onChange={(e) => onEnabledChange((e.currentTarget as HTMLInputElement).checked)} aria-label="Enable validation" />
             <span>Enable</span>
           </label>
-          <button class="wl-btn" onClick={() => setOpen(v => !v)}>{open ? 'Collapse' : 'Expand'}</button>
+          <button class="wl-btn" onClick={() => setOpen(v => !v)} aria-expanded={open} aria-label={open ? 'Collapse validation panel' : 'Expand validation panel'}>{open ? 'Collapse' : 'Expand'}</button>
         </div>
       </div>
 
diff --git a/src/ui/components/query-builder/OrderBySelector.tsx b/src/ui/components/query-builder/OrderBySelector.tsx
index 8929298..19fac6d 100644
--- a/src/ui/components/query-builder/OrderBySelector.tsx
+++ b/src/ui/components/query-builder/OrderBySelector.tsx
@@ -12,12 +12,13 @@ export function OrderBySelector(props: {
   const { fields, orderBy, onChange } = props;
 
   return (
-    <div class="wl-qb-section">
-      <div class="wl-qb-sectionLabel">Order By</div>
+    <div class="wl-qb-section" role="group" aria-label="Order by configuration">
+      <div class="wl-qb-sectionLabel" id="wl-qb-orderby-label">Order By</div>
       <div class="wl-qb-orderRow">
         <select
           class="wl-select"
           style="flex:1"
+          aria-labelledby="wl-qb-orderby-label"
           value={orderBy?.field ?? ''}
           onChange={(e) => {
             const val = (e.currentTarget as HTMLSelectElement).value;
@@ -32,13 +33,17 @@ export function OrderBySelector(props: {
           {fields.map(f => <option key={f.name} value={f.name}>{fieldDisplay(f)}</option>)}
         </select>
         {orderBy && (
-          <div class="wl-qb-segmented">
+          <div class="wl-qb-segmented" role="radiogroup" aria-label="Sort direction">
             <button
               class={`wl-qb-segBtn${orderBy.direction === 'ASC' ? ' wl-qb-segBtnActive' : ''}`}
+              role="radio"
+              aria-checked={orderBy.direction === 'ASC'}
               onClick={() => onChange({ ...orderBy, direction: 'ASC' })}
             >ASC</button>
             <button
               class={`wl-qb-segBtn${orderBy.direction === 'DESC' ? ' wl-qb-segBtnActive' : ''}`}
+              role="radio"
+              aria-checked={orderBy.direction === 'DESC'}
               onClick={() => onChange({ ...orderBy, direction: 'DESC' })}
             >DESC</button>
           </div>
diff --git a/src/ui/components/query-builder/SoqlPreview.tsx b/src/ui/components/query-builder/SoqlPreview.tsx
index aacff2d..49a8dae 100644
--- a/src/ui/components/query-builder/SoqlPreview.tsx
+++ b/src/ui/components/query-builder/SoqlPreview.tsx
@@ -17,14 +17,14 @@ export function SoqlPreview(props: {
   }
 
   return (
-    <div class="wl-qb-section">
+    <div class="wl-qb-section" role="region" aria-label="SOQL preview">
       <div class="wl-qb-previewHeader">
         <span class="wl-qb-sectionLabel" style="margin-bottom:0">Preview</span>
-        <button class="wl-btn wl-btnPrimary" style="padding:6px 14px;font-size:11px" onClick={onApply}>
+        <button class="wl-btn wl-btnPrimary" style="padding:6px 14px;font-size:11px" onClick={onApply} aria-label="Apply SOQL to editor">
           Apply to Editor
         </button>
       </div>
-      <pre class="wl-qb-preview">{soql}</pre>
+      <pre class="wl-qb-preview" role="textbox" aria-readonly="true" aria-label="Generated SOQL query">{soql}</pre>
     </div>
   );
 }
diff --git a/src/ui/components/query-builder/SubqueryBuilder.tsx b/src/ui/components/query-builder/SubqueryBuilder.tsx
index d5630a1..2f80d4c 100644
--- a/src/ui/components/query-builder/SubqueryBuilder.tsx
+++ b/src/ui/components/query-builder/SubqueryBuilder.tsx
@@ -49,11 +49,11 @@ export function SubqueryBuilder(props: {
   }
 
   return (
-    <div class="wl-qb-section">
-      <div class="wl-qb-sectionLabel">
+    <div class="wl-qb-section" role="group" aria-label="Subquery builder">
+      <div class="wl-qb-sectionLabel" id="wl-qb-subquery-label">
         Subqueries (Child Relationships)
         {subqueries.length > 0 && (
-          <span class="wl-badge" style="margin-left:8px;font-weight:700;padding:2px 8px">
+          <span class="wl-badge" style="margin-left:8px;font-weight:700;padding:2px 8px" aria-label={`${subqueries.length} subqueries`}>
             {subqueries.length}
           </span>
         )}
diff --git a/src/ui/components/query-builder/WhereBuilder.tsx b/src/ui/components/query-builder/WhereBuilder.tsx
index 275edf1..f451ada 100644
--- a/src/ui/components/query-builder/WhereBuilder.tsx
+++ b/src/ui/components/query-builder/WhereBuilder.tsx
@@ -1,4 +1,4 @@
-import type { VNode } from 'preact';
+import type { VNode } from 'preact';
 import { h } from 'preact';
 import { useMemo } from 'preact/hooks';
 import type { SObjectField } from '../../../core/types/salesforce';
@@ -44,8 +44,8 @@ export function WhereBuilder(props: {
   }
 
   return (
-    <div class="wl-qb-section">
-      <div class="wl-qb-sectionLabel">Where</div>
+    <div class="wl-qb-section" role="group" aria-label="Where clause builder">
+      <div class="wl-qb-sectionLabel" id="wl-qb-where-label">Where</div>
       <div class="wl-qb-condGroup">
         {conditions.map((cond, i) => {
           const field = fieldMap.get(cond.field);
@@ -72,8 +72,7 @@ export function WhereBuilder(props: {
               )}
 
               <div class="wl-qb-condCard">
-                <select
-                  class="wl-select wl-qb-condField"
+                <select class="wl-select wl-qb-condField" aria-label="Condition field"
                   value={cond.field}
                   onChange={(e) => update(i, { field: (e.currentTarget as HTMLSelectElement).value })}
                 >
@@ -81,8 +80,7 @@ export function WhereBuilder(props: {
                   {fields.map(f => <option key={f.name} value={f.name}>{fieldDisplay(f)}</option>)}
                 </select>
 
-                <select
-                  class="wl-select wl-qb-condOp"
+                <select class="wl-select wl-qb-condOp" aria-label="Condition operator"
                   value={cond.operator}
                   onChange={(e) => update(i, { operator: (e.currentTarget as HTMLSelectElement).value as SoqlOperator })}
                 >
@@ -91,17 +89,14 @@ export function WhereBuilder(props: {
 
                 {renderValueInput(cond, field, picklist, i)}
 
-                <button
-                  class="wl-qb-condRemove"
-                  onClick={() => remove(i)}
-                  title="Remove condition"
+                <button class="wl-qb-condRemove" onClick={() => remove(i)} title="Remove condition" aria-label="Remove this condition"
                 >&times;</button>
               </div>
             </div>
           );
         })}
       </div>
-      <button class="wl-qb-addBtn" onClick={add} disabled={fields.length === 0}>
+      <button class="wl-qb-addBtn" onClick={add} disabled={fields.length === 0} aria-label="Add new where condition">
         + Add Condition
       </button>
     </div>
@@ -232,3 +227,4 @@ export function WhereBuilder(props: {
     );
   }
 }
+