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,