Work workspace with runs, change and facts tabs; vim keys; responsive Board; theme file

tui/logdiff.go

@@ -10,6 +10,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"os"
 	"os/exec"
 	"strings"
 	"time"
@@ -77,6 +78,9 @@ func worktreeDiff(dir, base string) (string, error) {
 	if base == "" {
 		base = "main"
 	}
+	if st, err := os.Stat(dir); err != nil || !st.IsDir() {
+		return "", fmt.Errorf("the task's folder %s no longer exists, so there is nothing to compare", dir)
+	}
 	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
 	defer cancel()