Comments: Sidebar update

[D-Rekk]

Implementing idea from #1664.

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Preview

Features:

• Layout is dynamic and responsive
• Sidebars are attached and scrollable
• Added grid composition to related videos
• player width is correctly set through JS (temporary)

What's missing yet?

• Option relocation and renaming convention. This option is currently located in Appearance -> Comments solely as "Sidebar". Instead, it should be placed in Appearance -> Sidebar under the name of "Swap Sidebar with Comments"
• Many styles should be extracted in their own setting options, such as:
  • "Comments as Sidebar" (currently available only on width 1984px+. Zoom at 80% to try)
  • "Comments Sidebar - To the left"

What's not working with Comments -> Sidebar activated?

• Any Player -> Player Size other than "normal"
• Sidebar -> To The Side! which should get removed in favor of a grid option
• Other visibility settings in Appearance that affect Sidebar and Comments

[ImprovedTube]

exciting!

• the related videos grid works well & can be a good feature alone too (can then start below 1920)
  • grid doesnt seem to take effect when logged-out of youtube (?)
• ( scrollbars will also make another feature alone, without comments in sidebar) )

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• chrome & windows10 gives me the empty/not functioning scrollbars
• we could release it immediately keeping the old feature, and the new one as comments : "sidebar+" - or could rename the old feature comments > sidebar-simple and migrating the setting there (through background.js) considering setups where the new one isnt yet supported

[D-Rekk]

Should be all set!

• Script updated to fix Windows sidebars + working on first install
• I'm down for it. Could also be a way for users to preview the layout customization before these become their own setting options
• Agree, doable as a standalone feature
• Same as above
• I forgot flex-direction: row 🫠. Fixed

BTW I did a mess with the last commits never again editing on GitHub editor. Squash it all 🫥