Extract avatar lookup logic from KnownAvatar into three methods: SyncAvatarsHashMap (sync local avatar map), KnownAvatarUUID (check by UUID via UUIDNameReply), and KnownAvatarName (check by display name via AvatarPickerReply). Reworked KnownAvatar to call SyncAvatarsHashMap and then validate using the new helpers, returning false for UUID.Zero and avoiding the previous always-true outcome. Preserves event subscription/teardown and timeout waits while clarifying visibility (protected helpers, public KnownAvatar) and cleaning up callback logic.
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