fix[click download: Access denied by the platform]

[mazezen]

Issue: Fix Downloading YouTube videos: Access denied by the platform #51

Add the following:

1. Obtain the cookie, and include it when downloading. Set it to an empty string to disable
2. Increase the number of retry attempts for failures

code:
`

Path to yt-dlp (use Homebrew version which has YouTube fixes)

YT_DLP_PATH = os.environ.get("YT_DLP_PATH", "/opt/homebrew/bin/yt-dlp")

Browser for yt-dlp cookie extraction (set to empty string to disable)

COOKIES_BROWSER = os.environ.get("COOKIES_BROWSER", "brave")

Build --cookies-from-browser args if configured

COOKIE_ARGS = ["--cookies-from-browser", COOKIES_BROWSER] if COOKIES_BROWSER else []

cmd = [YT_DLP_PATH, "--no-playlist", "-o", out_template]
cmd += COOKIE_ARGS
cmd += ["--extractor-retries", "3", "--retries", "5"]
`