Add an 'Open Logs' button to the About dialog that opens the app log folder via QDesktopServices/QUrl, ensures the log directory exists, and logs warnings/errors. Include minimal styling and a handler (open_logs_folder) that uses APP_LOG_DIR and the logger. Also update settings dialog imports to include QUrl/QDesktopServices and APP_LOG_DIR. Simplify the bug report template to instruct users to open logs from the About dialog and attach ytsage.log / ytsage_error.log.
Introduce check_ytdlp_deno_integration() in ytsage_yt_dlp.py to detect Deno integration by running `yt-dlp --verbose` and scanning debug output for JS runtimes containing "deno" (with timeout and logging/fallback).
Add SystemInfoThread (QThread) in ytsage_dialogs_base.py to collect yt-dlp, ffmpeg and deno presence, versions, paths, cache timestamps and integration status in the background, emitting the gathered info via info_ready. AboutDialog now starts the thread in update_system_info() and populates the UI asynchronously via _populate_system_info(), showing a small "+ yt-dlp" integration indicator next to the Deno status when detected. Refactors usage of version/cache lookups to use the thread-provided info dictionary.
Moved all files from src/gui/ to ytsage/gui/ and updated import statements to use relative imports within the new package structure. This improves modularity and prepares the codebase for distribution as a proper Python package.
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