Refactor web build process and update documentation

- Removed Node.js build artifacts from .gitignore and adjusted Makefile to reflect changes in web UI build process, now using server-rendered Go templates instead of React.
- Updated README to clarify the new web UI architecture and output formats, emphasizing the removal of the Node.js build step.
- Added a command to set the number of frames per render task in manager configuration, enhancing user control over rendering settings.
- Improved Gitea workflow by removing unnecessary npm install step, streamlining the CI process.

pkg/executils/exec_test.go

@@ -0,0 +1,32 @@
+package executils
+
+import (
+	"errors"
+	"io"
+	"os"
+	"testing"
+)
+
+func TestIsBenignPipeReadError(t *testing.T) {
+	tests := []struct {
+		name string
+		err  error
+		want bool
+	}{
+		{name: "nil", err: nil, want: false},
+		{name: "eof", err: io.EOF, want: true},
+		{name: "closed", err: os.ErrClosed, want: true},
+		{name: "closed pipe", err: io.ErrClosedPipe, want: true},
+		{name: "wrapped closed", err: errors.New("read |0: file already closed"), want: true},
+		{name: "other", err: errors.New("permission denied"), want: false},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got := isBenignPipeReadError(tc.err)
+			if got != tc.want {
+				t.Fatalf("got %v, want %v (err=%v)", got, tc.want, tc.err)
+			}
+		})
+	}
+}