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Andrew Zambazos 51ebbee40f Add hello-nebula and YouTube-dislike extensions

Add two Nebula extension packages:

- hello-nebula: a minimal demo extension that shows a small badge on pages (manifest, content.js, content.css, README).
- return-youtube-dislike: a content-script port that shows estimated YouTube dislike counts using the public Return YouTube Dislike API (manifest, content.js, content.css, README). Includes GPL-3.0 LICENSE and required attribution. READMEs contain install instructions and notes.

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content.css

Add hello-nebula and YouTube-dislike extensions

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content.js

Add hello-nebula and YouTube-dislike extensions

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LICENSE.txt

Add hello-nebula and YouTube-dislike extensions

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manifest.json

Add hello-nebula and YouTube-dislike extensions

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README.txt

Add hello-nebula and YouTube-dislike extensions

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README.txt

Return YouTube Dislike (Nebula)
===============================

Shows estimated YouTube dislike counts using the public
Return YouTube Dislike API.

Based on / inspired by:
  https://github.com/Anarios/return-youtube-dislike
  https://returnyoutubedislike.com

API attribution (required by RYD):
  https://returnyoutubedislike.com

License:
  This Nebula package is a simplified derivative intended for use with
  Nebula's native extension runtime. Upstream project is GPL-3.0.
  See LICENSE.txt.

Install
-------
Copy this folder to:

  %LOCALAPPDATA%\Nebula\User Data\extensions\return-youtube-dislike\

Open Settings > Plugins > Reload Plugins, then open a YouTube video.

Notes
-----
- Content-script only (no Chrome extension APIs)
- No dislike vote submission to RYD
- No premium analytics UI
- Respect RYD rate limits (100/min, 10k/day)