optimize codebase

main.go:
- Eliminated ~160 lines of duplicate code: Extracted 3 new helper functions at the bottom of the file:
buildVideoMenuOptions([]VideoOption) — builds the Discord select menu options for video formats
buildAudioMenuOptions([]AudioOption) — same for audio
fetchAndShowFormats(s, i, url) — fetches formats, sorts them, builds menus, stores state, and edits the interaction; previously duplicated identically in both the download and download video command handlers
- Fixed time.Sleep ordering bug: The startAsyncDownload goroutine was launched before InteractionRespond with a 100ms sleep to compensate. Now the download is launched after InteractionRespond returns — no sleep needed. Removed "time" import.
- Used helpers in video_select handler: The two inline menu-building loops in that handler now call buildAudioMenuOptions / buildVideoMenuOptions

misc.go:
- Moved regexp.MustCompile(...) to a package-level var urlPattern — previously it recompiled the regex on every call to extractURLFromString
- Simplified the function body to a single return line

app/misc.go

@@ -8,11 +8,10 @@ import (
 
 var loading_emoji = os.Getenv("LOADING_EMOJI")
 
-func extractURLFromString(in_url string) string {
-	url_pattern := regexp.MustCompile(`https?://\S+`)
-	var match = url_pattern.Find([]byte(in_url))
+var urlPattern = regexp.MustCompile(`https?://\S+`)
 
-	return string(match)
+func extractURLFromString(in_url string) string {
+	return string(urlPattern.Find([]byte(in_url)))
 }
 
 // Helper function to create string pointer