Add startup logging and Discord ready timeout

Adds log lines at each startup step so the log file is never empty on
failure. Adds a 30s timeout on the Discord ready event so a bad token or
blocked network produces a clear log message instead of a silent hang.
Falls back to %TEMP% for the log file if the exe directory isn't writable.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

main.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"fyne.io/systray"
 	"github.com/bwmarrin/discordgo"
@@ -120,19 +121,34 @@ func toggleMute(dg *discordgo.Session, cfg *Config, muted bool) {
 	}
 }
 
-func run() {
-	// Log to file next to the executable so errors are visible even without a console.
+func setupLogging() {
+	// Try exe directory first, fall back to temp dir (e.g. if installed in Program Files).
+	var dirs []string
 	if exe, err := os.Executable(); err == nil {
-		logPath := filepath.Join(filepath.Dir(exe), "discord-lobby-mute.log")
-		if f, err := os.OpenFile(logPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644); err == nil {
+		dirs = append(dirs, filepath.Dir(exe))
+	}
+	dirs = append(dirs, os.TempDir())
+
+	for _, dir := range dirs {
+		logPath := filepath.Join(dir, "discord-lobby-mute.log")
+		f, err := os.OpenFile(logPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
+		if err != nil {
+			continue
+		}
 		log.SetOutput(io.MultiWriter(os.Stderr, f))
+		return
 	}
-	}
+}
+
+func run() {
+	setupLogging()
+	log.Println("starting")
 
 	cfg, err := loadConfig()
 	if err != nil {
 		log.Fatal(err)
 	}
+	log.Println("config loaded")
 
 	dg, err := discordgo.New("Bot " + cfg.Token)
 	if err != nil {
@@ -145,13 +161,18 @@ func run() {
 		close(ready)
 	})
 
+	log.Println("connecting to Discord...")
 	if err := dg.Open(); err != nil {
 		log.Fatalf("connect to Discord: %v", err)
 	}
 	defer dg.Close()
 
-	<-ready
-	log.Println("Connected to Discord.")
+	select {
+	case <-ready:
+	case <-time.After(30 * time.Second):
+		log.Fatal("timed out waiting for Discord ready — check token and network connection")
+	}
+	log.Println("connected to Discord")
 
 	keydownCh, err := startHotkey(cfg.Keybind)
 	if err != nil {