small bug and feature request

*I'm submitting a ...*
- [x ] bug report
- [x ] feature request
- [ ] support request

## General infomration

### Prerequisites

* [x ] Are you running the latest version?

### Installation

* [ ] I installed the plugin via zip from the Releases page
* [x ] I´m using the Netflix Repo
* [ ] I´m using a different source (Please tell which)

### Operating System

* [ ] Raspberry Pi B

1. when i have already seen an episode it is marked as "checked". and when i restart my pi and go to the series i also see the check sign but when i play a episode (and stop it or what it to the end) the check sign is missing and all episodes have got an [] after restarting my PI they are checked again

2.it would be nice if an season is watched to also have an checked sign

3.if its not already possible and i didnt find it, it would be nice if the next episode will be played after the last is finished. i already got that when im playing from my kodi library (Nextup service notification)

The issue names no files, tests, or entry points. Start by reproducing the watched-state behavior on Kodi with the Netflix repository, then trace the episode and playback handling to separate the persistence bug from season marking and automatic next-episode playback. Done means the requested behavior is reproduced, specified, and verified for each of the three requests.

Written by the indexing model from the issue text.