Improve freeflow immersion: Jump To seeks playback and keep scroll position

[L-M-Sherlock]

My current workflow of Free-Flow Immersion:

1. I hide the subtitle during watching.
2. When I don't understand the current dialogue, I use "Mine current subtitle" to add the current line to the mining history. I learn this method from Add timestamps bookmark function when doing freeflow listening #374 (comment)
3. When I finish the entire episode, I open the mining history and mine the unknown cards.

The problems of the current workflow:

1. The "jump to" doesn't affect the video. To use it, I have to show the subtitle list and locate the video via clicking the subtitle located by "jump to".
2. After I mine the unknown word via yomitan, the web-socket-server help me add the picture and sentence audio. But this action refresh the mining history with a new log, which let me have to locate the next line I want to jump to again. When I have 30+ logs in the mining history, it's annoying because I have to spend 50% time to re-locate the next line.

This PR:

1. The "jump to" will locate the subtitle in the list and the video in the same time, which save me an extra click.
2. New mining history log will not refresh the side panel if my current position is not the bottom.
3. I add /scripts/web-socket-server/asbplayer-ws to the .gitignore because I made the server as a background service which is based on the binary file.

Now I can skip the step 2 shown in the following screenshot:

Update:

1. 35395fa scripts/web-socket-server/build builds main.go into asbplayer-ws in the same directory

[killergerbah]

Thanks! This feels like an improvement to the jump-to behavior which was pretty bare bones. Also wondering if we can improve how we update the mining history in general, since it can get filled with a lot of similar cards.

[L-M-Sherlock]

OK, now it works well in my test.

[L-M-Sherlock]

I fixed a small bug to avoid jumping when loading new subtitle file.

[killergerbah]

Great, thanks for doing this