fix(a11y): label remaining unlabeled icon buttons across 12 components\n\nCo-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/components/DeviceVerificationSetup.tsx

@@ -336,7 +336,7 @@ export const DeviceVerificationReset = forwardRef<HTMLDivElement, DeviceVerifica
           <Box grow="Yes">
             <Text size="H4">Reset Device Verification</Text>
           </Box>
-          <IconButton size="300" radii="300" onClick={onCancel}>
+          <IconButton size="300" radii="300" onClick={onCancel} aria-label="Cancel">
             <Icon src={Icons.Cross} />
           </IconButton>
         </Header>

src/app/components/editor/Toolbar.tsx

@@ -217,7 +217,9 @@ export function HeadingBlockButton() {
         style={{ width: 'unset' }}
         variant="SurfaceVariant"
         onClick={handleMenuOpen}
-        aria-pressed={isActive}
+        aria-label={level ? `Heading ${level}` : 'Heading'}
+        aria-expanded={isActive}
+        aria-haspopup="menu"
         size="400"
         radii="300"
       >
@@ -373,6 +375,7 @@ export function Toolbar() {
                   ref={triggerRef}
                   variant="SurfaceVariant"
                   onClick={() => setIsMarkdown(!isMarkdown)}
+                  aria-label={isMarkdown ? 'Disable Markdown' : 'Enable Markdown'}
                   aria-pressed={isMarkdown}
                   size="300"
                   radii="300"

src/app/components/user-profile/PowerChip.tsx

@@ -120,7 +120,7 @@ function SharedPowerAlert({ power, onCancel, onChange }: SharedPowerAlertProps)
               <Box grow="Yes">
                 <Text size="H4">Shared Power</Text>
               </Box>
-              <IconButton size="300" onClick={onCancel} radii="300">
+              <IconButton size="300" onClick={onCancel} radii="300" aria-label="Cancel">
                 <Icon src={Icons.Cross} />
               </IconButton>
             </Header>