[Feature]: Less iframe nesting for embed mode in YT

[ChrRubin]

Checklist

• This is a suggestion for LiveTL, not Hyperchat. I will go to the Hyperchat repo to suggest a feature for Hyperchat.
• This is a suggestion for the LiveTL web extension, not LiveTL iOS or LiveTL Android. I will go to the iOS or Android repo to suggest features for those platforms.
• I have checked for a duplicate or similar feature request/issue. I made sure to check closed issues as well.
• I am not reporting a bug. If I am, I will use the bug report issue template.
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Is your feature request related to a problem? Please describe.

Currently Embed Mode on YT nests the entire watch page into the YTC iframe. This causes problems such as resizing the window kills LTL, since YTC just refreshes itself for some reason, and just overall jank.

Describe the solution you'd like

Inject the resize bar and popup page at the bottom of the YTC frame. We already have it working on Twitch, just have to move it to YTC.

After we implement this we can probably simplify the logic of the watch page too, since it no longer needs a "only chat and filter output" mode.

Describe alternatives you've considered

No response

Anything else?

No response

[ChrRubin]

Nvm YT is dumb and reloads the entire frame so even if we don't nest the entire watch page LTL on Embed Mode will still get killed on window resize.

Only way to solve that would be to inject LTL outside of the YTC frame.