diff --git a/src/ui/components/main/AgentControls.tsx b/src/ui/components/main/AgentControls.tsx
index 4e37ace..8bb1906 100644
--- a/src/ui/components/main/AgentControls.tsx
+++ b/src/ui/components/main/AgentControls.tsx
@@ -36,6 +36,7 @@ export function AgentControls({
                 onClick={toggleAgent}
                 disabled={updateConfig.isPending}
                 title={isEnabled ? "Pause agent" : "Resume agent"}
+                aria-label={isEnabled ? "Pause agent" : "Resume agent"}
             >
                 {isEnabled ? (
                     <Pause className="h-3.5 w-3.5" />
diff --git a/src/ui/components/settings/sections/BudgetSection.tsx b/src/ui/components/settings/sections/BudgetSection.tsx
index 7b329f1..f788b1f 100644
--- a/src/ui/components/settings/sections/BudgetSection.tsx
+++ b/src/ui/components/settings/sections/BudgetSection.tsx
@@ -53,6 +53,7 @@ export function BudgetSection() {
                                 max={100}
                                 step={5}
                                 className="w-full"
+                                aria-label={`Budget ceiling: ${ceiling}% of weekly budget`}
                             />
                             <div className="flex items-center justify-between">
                                 <p className="text-sm font-medium text-foreground">
diff --git a/src/ui/components/settings/sections/SchedulingSection.tsx b/src/ui/components/settings/sections/SchedulingSection.tsx
index ea3f12a..edbf8ca 100644
--- a/src/ui/components/settings/sections/SchedulingSection.tsx
+++ b/src/ui/components/settings/sections/SchedulingSection.tsx
@@ -194,31 +194,44 @@ export function SchedulingSection() {
                                 sublabel={`The agent will work between ${settings.scheduleStart} and ${settings.scheduleEnd}. Times are in ${settings.scheduleTimezone || detectedTimezone}.`}
                             >
                                 <div className="flex items-center gap-2">
-                                    <input
-                                        type="time"
-                                        value={settings.scheduleStart}
-                                        onChange={(e) =>
-                                            updateSetting({
-                                                key: "scheduleStart",
-                                                value: e.target.value,
-                                            })
-                                        }
-                                        className="rounded-md border border-input bg-transparent px-2 py-1.5 text-xs outline-none focus:ring-1 focus:ring-ring"
-                                    />
-                                    <span className="text-xs text-muted-foreground">
+                                    <label className="flex items-center gap-1.5">
+                                        <span className="sr-only">
+                                            Start time
+                                        </span>
+                                        <input
+                                            type="time"
+                                            value={settings.scheduleStart}
+                                            onChange={(e) =>
+                                                updateSetting({
+                                                    key: "scheduleStart",
+                                                    value: e.target.value,
+                                                })
+                                            }
+                                            className="rounded-md border border-input bg-transparent px-2 py-1.5 text-xs outline-none focus:ring-1 focus:ring-ring"
+                                        />
+                                    </label>
+                                    <span
+                                        className="text-xs text-muted-foreground"
+                                        aria-hidden="true"
+                                    >
                                         to
                                     </span>
-                                    <input
-                                        type="time"
-                                        value={settings.scheduleEnd}
-                                        onChange={(e) =>
-                                            updateSetting({
-                                                key: "scheduleEnd",
-                                                value: e.target.value,
-                                            })
-                                        }
-                                        className="rounded-md border border-input bg-transparent px-2 py-1.5 text-xs outline-none focus:ring-1 focus:ring-ring"
-                                    />
+                                    <label className="flex items-center gap-1.5">
+                                        <span className="sr-only">
+                                            End time
+                                        </span>
+                                        <input
+                                            type="time"
+                                            value={settings.scheduleEnd}
+                                            onChange={(e) =>
+                                                updateSetting({
+                                                    key: "scheduleEnd",
+                                                    value: e.target.value,
+                                                })
+                                            }
+                                            className="rounded-md border border-input bg-transparent px-2 py-1.5 text-xs outline-none focus:ring-1 focus:ring-ring"
+                                        />
+                                    </label>
                                 </div>
                             </SettingsRow>
                         </div>
diff --git a/src/ui/components/sidebar/AiStatusCard.tsx b/src/ui/components/sidebar/AiStatusCard.tsx
index 43a963c..b757af8 100644
--- a/src/ui/components/sidebar/AiStatusCard.tsx
+++ b/src/ui/components/sidebar/AiStatusCard.tsx
@@ -33,10 +33,16 @@ export function AiStatusCard() {
             : 0;
     const remainingPercent = 100 - usedPercent;
 
-    // Bar color
+    // Bar color and budget level label
     let barColor = "bg-foreground";
-    if (remainingPercent <= 10) barColor = "bg-red-500";
-    else if (remainingPercent <= 30) barColor = "bg-amber-500";
+    let budgetLevel = "";
+    if (remainingPercent <= 10) {
+        barColor = "bg-red-500";
+        budgetLevel = "Critical";
+    } else if (remainingPercent <= 30) {
+        barColor = "bg-amber-500";
+        budgetLevel = "Low";
+    }
 
     // Status display
     let icon: React.ReactNode;
@@ -136,7 +142,14 @@ export function AiStatusCard() {
                 {/* Budget bar */}
                 {budget && (
                     <div className="mt-2.5">
-                        <div className="h-1 w-full rounded-full bg-sidebar-border/40 overflow-hidden">
+                        <div
+                            role="progressbar"
+                            aria-label="Budget remaining"
+                            aria-valuenow={Math.round(remainingPercent)}
+                            aria-valuemin={0}
+                            aria-valuemax={100}
+                            className="h-1 w-full rounded-full bg-sidebar-border/40 overflow-hidden"
+                        >
                             <div
                                 className={`h-full rounded-full transition-all ${barColor}`}
                                 style={{
@@ -145,6 +158,12 @@ export function AiStatusCard() {
                             />
                         </div>
                         <p className="mt-1 text-[10px] tabular-nums text-sidebar-foreground/50">
+                            {budgetLevel && (
+                                <span className="font-medium">
+                                    {budgetLevel}
+                                    {" \u00B7 "}
+                                </span>
+                            )}
                             {Math.round(available / 1000)}k remaining
                         </p>
                     </div>
diff --git a/src/ui/components/sidebar/ProjectItem.tsx b/src/ui/components/sidebar/ProjectItem.tsx
index 131bbd9..e02233e 100644
--- a/src/ui/components/sidebar/ProjectItem.tsx
+++ b/src/ui/components/sidebar/ProjectItem.tsx
@@ -61,7 +61,15 @@ export function ProjectItem({
                     {initial}
                 </span>
                 {hasUnseenReview && (
-                    <span className="absolute -right-0.5 -top-0.5 h-2 w-2 rounded-full bg-red-500 ring-2 ring-sidebar" />
+                    <>
+                        <span
+                            className="absolute -right-0.5 -top-0.5 h-2 w-2 rounded-full bg-red-500 ring-2 ring-sidebar"
+                            aria-hidden="true"
+                        />
+                        <span className="sr-only">
+                            Has tasks awaiting review
+                        </span>
+                    </>
                 )}
             </span>
             <span className="flex-1 truncate text-[13px] font-medium">
diff --git a/src/ui/components/sidebar/ProjectList.tsx b/src/ui/components/sidebar/ProjectList.tsx
index a1dd8b1..cb5eadb 100644
--- a/src/ui/components/sidebar/ProjectList.tsx
+++ b/src/ui/components/sidebar/ProjectList.tsx
@@ -38,16 +38,17 @@ export function ProjectList({ search }: ProjectListProps) {
 
     return (
         <ScrollArea className="flex-1">
-            <div className="space-y-1 px-3">
+            <ul className="space-y-1 px-3" aria-label="Projects">
                 {filtered.map((repo) => (
-                    <ProjectItem
-                        key={repo.id}
-                        repository={repo}
-                        isSelected={selectedRepositoryId === repo.id}
-                        onSelect={() => setSelectedRepository(repo.id)}
-                    />
+                    <li key={repo.id}>
+                        <ProjectItem
+                            repository={repo}
+                            isSelected={selectedRepositoryId === repo.id}
+                            onSelect={() => setSelectedRepository(repo.id)}
+                        />
+                    </li>
                 ))}
-            </div>
+            </ul>
         </ScrollArea>
     );
 }
diff --git a/src/ui/components/tasks/TaskRow.tsx b/src/ui/components/tasks/TaskRow.tsx
index b4ade6c..d0d681a 100644
--- a/src/ui/components/tasks/TaskRow.tsx
+++ b/src/ui/components/tasks/TaskRow.tsx
@@ -129,7 +129,7 @@ export function TaskRow({
     const stateIcon = (() => {
         if (isQueued) {
             return (
-                <span className="shrink-0">
+                <span className="shrink-0" aria-label="Queued">
                     <Clock className="h-4 w-4 text-violet-500" />
                 </span>
             );
@@ -141,6 +141,7 @@ export function TaskRow({
                     <button
                         type="button"
                         onClick={handleToggleDone}
+                        aria-label="Mark as done"
                         className="group/circle shrink-0"
                     >
                         <Circle className="h-4 w-4 text-muted-foreground/40 transition-colors group-hover/circle:text-green-500" />
@@ -151,6 +152,7 @@ export function TaskRow({
                     <button
                         type="button"
                         onClick={handleToggleDone}
+                        aria-label="Mark as done (currently in progress)"
                         className="group/circle shrink-0"
                     >
                         <Loader2 className="h-4 w-4 text-blue-500 animate-spin transition-colors group-hover/circle:text-green-500 group-hover/circle:animate-none" />
@@ -161,6 +163,7 @@ export function TaskRow({
                     <button
                         type="button"
                         onClick={handleToggleDone}
+                        aria-label="Mark as done (currently awaiting review)"
                         className="group/circle shrink-0"
                     >
                         <GitPullRequest className="h-4 w-4 text-amber-500 transition-colors group-hover/circle:text-green-500" />
@@ -171,6 +174,7 @@ export function TaskRow({
                     <button
                         type="button"
                         onClick={handleToggleDone}
+                        aria-label="Mark as pending (currently done)"
                         className="shrink-0"
                     >
                         <CheckCircle2 className="h-4 w-4 text-green-500" />
@@ -181,6 +185,7 @@ export function TaskRow({
                     <button
                         type="button"
                         onClick={handleToggleDone}
+                        aria-label="Mark as pending (currently dismissed)"
                         className="shrink-0"
                     >
                         <XCircle className="h-4 w-4 text-muted-foreground/50" />
@@ -203,6 +208,7 @@ export function TaskRow({
                 {showActions ? (
                     <button
                         type="button"
+                        aria-label="Drag to reorder"
                         className="mt-0.5 cursor-grab touch-none text-muted-foreground/30 hover:text-muted-foreground"
                         {...attributes}
                         {...listeners}
@@ -281,6 +287,7 @@ export function TaskRow({
                     <div className="mt-0.5 flex items-center gap-0.5">
                         <button
                             type="button"
+                            aria-label="Edit task"
                             className="rounded-md p-1 text-muted-foreground/50 hover:text-foreground hover:bg-accent transition-colors"
                             onClick={handleStartEdit}
                         >
@@ -288,6 +295,7 @@ export function TaskRow({
                         </button>
                         <button
                             type="button"
+                            aria-label="Add comment"
                             className="rounded-md p-1 text-muted-foreground/50 hover:text-foreground hover:bg-accent transition-colors"
                             onClick={handleToggleComment}
                         >