feat(a11y): form input labels (H-6), remaining button labels (C-1)

H-6: aria-label on all form inputs missing accessible names:
  - Login: username, password (already done)
  - Register: username, password, confirm, token, email
  - Password reset: email, new password, confirm password
  - Settings: display name, user ID to ignore, keyword, page zoom,
    date format, device name, backup passwords (new/confirm/restore)
  - Auth: server URL picker input
C-1: additional icon buttons:
  - RoomInput: toolbar toggle (aria-pressed + label)
  - Lobby/Members: scroll to top, toggle member list
  - UIAFlowOverlay: cancel authentication
  - BackupRestore: backup options menu
  - UrlPreview: previous/next preview buttons
  - RoomPacks: undo remove/remove pack buttons
  - RoomViewHeader: start call, member list toggle
  - ServerPicker: change server button

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/settings/account/IgnoredUserList.tsx

@@ -57,6 +57,7 @@ function IgnoreUserInput({ userList }: { userList: string[] }) {
         <Input
           required
           name="userIdInput"
+          aria-label="User ID to ignore"
           value={userId}
           onChange={handleChange}
           variant="Secondary"

src/app/features/settings/account/Profile.tsx

@@ -263,6 +263,7 @@ function ProfileDisplayName({ profile, userId }: ProfileProps) {
             <Input
               required
               name="displayNameInput"
+              aria-label="Display name"
               value={displayName}
               onChange={handleChange}
               variant="Secondary"

src/app/features/settings/devices/DeviceTile.tsx

@@ -150,6 +150,7 @@ function DeviceRename({ device, onCancel, onRename, refreshDeviceList }: DeviceR
         <Box grow="Yes" direction="Column">
           <Input
             name="nameInput"
+            aria-label="Device display name"
             size="300"
             variant="Secondary"
             radii="300"

src/app/features/settings/devices/LocalBackup.tsx

@@ -70,6 +70,7 @@ function ExportKeys() {
                   <PasswordInput
                     ref={passRef}
                     name="passwordInput"
+                    aria-label="New backup password"
                     size="400"
                     variant="Secondary"
                     radii="300"
@@ -85,6 +86,7 @@ function ExportKeys() {
                     ref={confPassRef}
                     style={{ color: match ? undefined : color.Critical.Main }}
                     name="confirmPasswordInput"
+                    aria-label="Confirm backup password"
                     size="400"
                     variant="Secondary"
                     radii="300"
@@ -212,6 +214,7 @@ function ImportKeys({ file, onDone }: ImportKeysProps) {
             <Text size="L400">Password</Text>
             <PasswordInput
               name="passwordInput"
+              aria-label="Backup password"
               size="400"
               variant="Secondary"
               radii="300"

src/app/features/settings/general/General.tsx

@@ -293,6 +293,7 @@ function PageZoomInput() {
   return (
     <Input
       style={{ width: toRem(100) }}
+      aria-label="Page zoom percentage"
       variant={pageZoom === parseInt(currentZoom, 10) ? 'Secondary' : 'Success'}
       size="300"
       radii="300"
@@ -617,6 +618,7 @@ function CustomDateFormat({ value, onChange }: CustomDateFormatProps) {
           <Input
             required
             name="customDateFormatInput"
+            aria-label="Custom date format"
             value={dateFormatCustom}
             onChange={handleChange}
             maxLength={16}

src/app/features/settings/notifications/KeywordMessages.tsx

@@ -65,6 +65,7 @@ function KeywordInput() {
         <Input
           required
           name="keywordInput"
+          aria-label="Notification keyword"
           value={keyword}
           onChange={handleChange}
           variant="Secondary"

src/app/pages/auth/ServerPicker.tsx

@@ -80,6 +80,7 @@ export function ServerPicker({
   return (
     <Input
       ref={serverInputRef}
+      aria-label="Matrix server URL"
       style={{ paddingRight: config.space.S200 }}
       variant={allowCustomServer ? 'Background' : 'Surface'}
       outlined

src/app/pages/auth/register/PasswordRegisterForm.tsx

@@ -265,6 +265,7 @@ export function PasswordRegisterForm({
             variant="Background"
             defaultValue={defaultUsername}
             name="usernameInput"
+            aria-label="Username"
             size="500"
             outlined
             required
@@ -290,6 +291,7 @@ export function PasswordRegisterForm({
                   ref={passRef}
                   onChange={doMatch}
                   name="passwordInput"
+                  aria-label="Password"
                   variant="Background"
                   size="500"
                   outlined
@@ -320,6 +322,7 @@ export function PasswordRegisterForm({
                   ref={confPassRef}
                   onChange={doMatch}
                   name="confirmPasswordInput"
+                  aria-label="Confirm password"
                   variant="Background"
                   size="500"
                   style={{ color: match ? undefined : color.Critical.Main }}
@@ -341,6 +344,7 @@ export function PasswordRegisterForm({
               variant="Background"
               defaultValue={defaultRegisterToken}
               name="tokenInput"
+              aria-label="Registration token"
               size="500"
               required={requiredStageInFlows(uiaFlows, AuthType.RegistrationToken)}
               outlined
@@ -356,6 +360,7 @@ export function PasswordRegisterForm({
               variant="Background"
               defaultValue={defaultEmail}
               name="emailInput"
+              aria-label="Email address"
               type="email"
               size="500"
               required={requiredStageInFlows(uiaFlows, AuthType.Email)}

src/app/pages/auth/reset-password/PasswordResetForm.tsx

@@ -177,6 +177,7 @@ export function PasswordResetForm({ defaultEmail }: PasswordResetFormProps) {
           defaultValue={defaultEmail}
           type="email"
           name="emailInput"
+          aria-label="Email address"
           variant="Background"
           size="500"
           required
@@ -199,6 +200,7 @@ export function PasswordResetForm({ defaultEmail }: PasswordResetFormProps) {
                 ref={passRef}
                 onChange={doMatch}
                 name="passwordInput"
+                aria-label="New password"
                 variant="Background"
                 size="500"
                 outlined
@@ -213,6 +215,7 @@ export function PasswordResetForm({ defaultEmail }: PasswordResetFormProps) {
                 ref={confPassRef}
                 onChange={doMatch}
                 name="confirmPasswordInput"
+                aria-label="Confirm new password"
                 variant="Background"
                 size="500"
                 style={{ color: match ? undefined : color.Critical.Main }}