feat: introduce theme management and performance improvements (#7)

internal/resolver/resolver.go

@@ -2,12 +2,16 @@ package resolver
 
 import (
 	"context"
+	"fmt"
 	"net"
+	"os"
 	"strconv"
 	"sync"
 	"time"
 )
 
+var debugTiming = os.Getenv("SNITCH_DEBUG_TIMING") != ""
+
 // Resolver handles DNS and service name resolution with caching and timeouts
 type Resolver struct {
 	timeout time.Duration
@@ -41,6 +45,7 @@ func (r *Resolver) ResolveAddr(addr string) string {
 	}
 
 	// Perform resolution with timeout
+	start := time.Now()
 	ctx, cancel := context.WithTimeout(context.Background(), r.timeout)
 	defer cancel()
 
@@ -55,6 +60,11 @@ func (r *Resolver) ResolveAddr(addr string) string {
 		}
 	}
 
+	elapsed := time.Since(start)
+	if debugTiming && elapsed > 50*time.Millisecond {
+		fmt.Fprintf(os.Stderr, "[timing] slow DNS lookup: %s -> %s (%v)\n", addr, resolved, elapsed)
+	}
+
 	// Cache the result
 	r.mutex.Lock()
 	r.cache[addr] = resolved