chore(lint): retire 19 explicit anys, ratchet to 49 warnings (#210)

Event handlers typed as React.MouseEvent, join errors as Error, the
service-worker session setter as strings, the UIA policy map and the
webkitAudioContext probe as narrow shapes. No behaviour change.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/features/call/CallMemberCard.tsx

@@ -41,7 +41,7 @@ export function CallMemberCard({ member }: CallMemberCardProps) {
       className={css.CallMemberCard}
       variant="SurfaceVariant"
       radii="500"
-      onClick={(evt: any) =>
+      onClick={(evt: React.MouseEvent) =>
         openUserProfile(
           room.roomId,
           undefined,

src/app/features/room/RoomTombstone.tsx

@@ -36,7 +36,7 @@ export function RoomTombstone({ roomId, body, replacementRoomId }: RoomTombstone
         <Text size="T400">{body || 'This room has been replaced and is no longer active.'}</Text>
         {joinState.status === AsyncStatus.Error && (
           <Text style={{ color: color.Critical.Main }} size="T200">
-            {(joinState.error as any)?.message ?? 'Failed to join replacement room!'}
+            {(joinState.error as Error | undefined)?.message ?? 'Failed to join replacement room!'}
           </Text>
         )}
       </Box>

src/app/features/room/message/Message.tsx

@@ -214,7 +214,7 @@ export const MessageAllReactionItem = as<
   return (
     <>
       <Overlay
-        onContextMenu={(evt: any) => {
+        onContextMenu={(evt: React.MouseEvent) => {
           evt.stopPropagation();
         }}
         open={open}
@@ -1087,7 +1087,7 @@ export const Message = React.memo(
 
       const handleContextMenu: MouseEventHandler<HTMLDivElement> = (evt) => {
         if (evt.altKey || !window.getSelection()?.isCollapsed || edit) return;
-        const tag = (evt.target as any).tagName;
+        const tag = (evt.target as HTMLElement | null)?.tagName;
         if (typeof tag === 'string' && tag.toLowerCase() === 'a') return;
         evt.preventDefault();
         if (coarsePointer) {
@@ -1155,7 +1155,7 @@ export const Message = React.memo(
               after={<Icon size="100" src={Icons.ReplyArrow} />}
               radii="300"
               data-event-id={mEvent.getId()}
-              onClick={(evt: any) => {
+              onClick={(evt: React.MouseEvent<HTMLButtonElement>) => {
                 onReplyClick(evt);
                 closeMenu();
               }}
@@ -1232,7 +1232,7 @@ export const Message = React.memo(
                 after={<Icon src={Icons.ThreadPlus} size="100" />}
                 radii="300"
                 data-event-id={mEvent.getId()}
-                onClick={(evt: any) => {
+                onClick={(evt: React.MouseEvent<HTMLButtonElement>) => {
                   onReplyClick(evt, true);
                   closeMenu();
                 }}
@@ -1599,7 +1599,7 @@ export const Event = React.memo(
       const stateEvent = typeof mEvent.getStateKey() === 'string';
       const handleContextMenu: MouseEventHandler<HTMLDivElement> = (evt) => {
         if (evt.altKey || !window.getSelection()?.isCollapsed) return;
-        const tag = (evt.target as any).tagName;
+        const tag = (evt.target as HTMLElement | null)?.tagName;
         if (typeof tag === 'string' && tag.toLowerCase() === 'a') return;
         evt.preventDefault();
         setMenuAnchor({

src/app/features/room/message/Reactions.tsx

@@ -202,7 +202,7 @@ export const Reactions = as<'div', ReactionsProps>(
         )}
         {reactions.length > 0 && (
           <Overlay
-            onContextMenu={(evt: any) => {
+            onContextMenu={(evt: React.MouseEvent) => {
               evt.stopPropagation();
             }}
             open={!!viewer}