fix 10.7.0 compatibility, simplify scss

Hyphens are added to user IDs from 10.7.0, so if the server is running
it, emails.json will be modified to include them. The existing file is
backed up. Also, scss files have been simplified since bs4-jf and bs5-jf share
much of the same content.

main.go

@@ -17,6 +17,7 @@ import (
 	"os/signal"
 	"path/filepath"
 	"runtime"
+	"strconv"
 	"strings"
 	"time"
 
@@ -460,6 +461,47 @@ func start(asDaemon, firstCall bool) {
 			app.err.Fatalf("Failed to authenticate with Jellyfin @ %s: Code %d", server, status)
 		}
 		app.info.Printf("Authenticated with %s", server)
+		// from 10.7.0, jellyfin hyphenates user IDs. This checks if the version is equal or higher.
+		checkVersion := func(version string) int {
+			numberStrings := strings.Split(version, ".")
+			n := 0
+			for _, s := range numberStrings {
+				num, err := strconv.Atoi(s)
+				if err == nil {
+					n += num
+				}
+			}
+			return n
+		}
+		if checkVersion(app.jf.ServerInfo.Version) >= checkVersion("10.7.0") {
+			noHyphens := true
+			for id := range app.storage.emails {
+				if strings.Contains(id, "-") {
+					noHyphens = false
+					break
+				}
+			}
+			if noHyphens {
+				app.info.Println(aurora.Yellow("From Jellyfin 10.7.0 onwards, user IDs are hyphenated.\nYour emails.json file will be modified to match this new format.\nA backup will be placed next to the file.\n"))
+				time.Sleep(time.Second * time.Duration(3))
+				newEmails, status, err := app.upgradeEmailStorage(app.storage.emails)
+				if status != 200 || err != nil {
+					app.err.Printf("Failed to get users from Jellyfin: Code %d", status)
+					app.debug.Printf("Error: %s", err)
+					app.err.Fatalf("Couldn't upgrade emails.json")
+				}
+				bakFile := app.storage.emails_path + ".bak"
+				err = storeJSON(bakFile, app.storage.emails)
+				if err != nil {
+					app.err.Fatalf("couldn't store emails.json backup: %s", err)
+				}
+				app.storage.emails = newEmails
+				err = app.storage.storeEmails()
+				if err != nil {
+					app.err.Fatalf("couldn't store emails.json: %s", err)
+				}
+			}
+		}
 		app.authJf, _ = jfapi.NewJellyfin(server, "jfa-go", app.version, "auth", "auth", common.NewTimeoutHandler("Jellyfin", server, true), cacheTimeout)
 
 		app.loadStrftime()