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.go

@@ -2,10 +2,13 @@ package executils
 
 import (
 	"bufio"
+	"context"
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
+	"strings"
 	"sync"
 	"time"
 
@@ -107,6 +110,78 @@ type CommandResult struct {
 	ExitCode int
 }
 
+// RunCommandWithTimeout is like RunCommand but kills the process after timeout.
+// A zero timeout means no timeout.
+func RunCommandWithTimeout(
+	timeout time.Duration,
+	cmdPath string,
+	args []string,
+	dir string,
+	env []string,
+	taskID int64,
+	tracker *ProcessTracker,
+) (*CommandResult, error) {
+	if timeout <= 0 {
+		return RunCommand(cmdPath, args, dir, env, taskID, tracker)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	cmd := exec.CommandContext(ctx, cmdPath, args...)
+	cmd.Dir = dir
+	if env != nil {
+		cmd.Env = env
+	}
+	stdoutPipe, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, fmt.Errorf("failed to create stdout pipe: %w", err)
+	}
+	stderrPipe, err := cmd.StderrPipe()
+	if err != nil {
+		return nil, fmt.Errorf("failed to create stderr pipe: %w", err)
+	}
+	if err := cmd.Start(); err != nil {
+		return nil, fmt.Errorf("failed to start command: %w", err)
+	}
+	if tracker != nil {
+		tracker.Track(taskID, cmd)
+		defer tracker.Untrack(taskID)
+	}
+	var stdoutBuf, stderrBuf []byte
+	var stdoutErr, stderrErr error
+	var wg sync.WaitGroup
+	wg.Add(2)
+	go func() {
+		defer wg.Done()
+		stdoutBuf, stdoutErr = readAll(stdoutPipe)
+	}()
+	go func() {
+		defer wg.Done()
+		stderrBuf, stderrErr = readAll(stderrPipe)
+	}()
+	waitErr := cmd.Wait()
+	wg.Wait()
+	if stdoutErr != nil && !isBenignPipeReadError(stdoutErr) {
+		return nil, fmt.Errorf("failed to read stdout: %w", stdoutErr)
+	}
+	if stderrErr != nil && !isBenignPipeReadError(stderrErr) {
+		return nil, fmt.Errorf("failed to read stderr: %w", stderrErr)
+	}
+	result := &CommandResult{Stdout: string(stdoutBuf), Stderr: string(stderrBuf)}
+	if waitErr != nil {
+		if exitErr, ok := waitErr.(*exec.ExitError); ok {
+			result.ExitCode = exitErr.ExitCode()
+		} else {
+			result.ExitCode = -1
+		}
+		if ctx.Err() == context.DeadlineExceeded {
+			return result, fmt.Errorf("command timed out after %v: %w", timeout, waitErr)
+		}
+		return result, waitErr
+	}
+	result.ExitCode = 0
+	return result, nil
+}
+
 // RunCommand executes a command and returns the output
 // If tracker is provided, the process will be registered for tracking
 // This is useful for commands where you need to capture output (like metadata extraction)
@@ -164,10 +239,10 @@ func RunCommand(
 	wg.Wait()
 
 	// Check for read errors
-	if stdoutErr != nil {
+	if stdoutErr != nil && !isBenignPipeReadError(stdoutErr) {
 		return nil, fmt.Errorf("failed to read stdout: %w", stdoutErr)
 	}
-	if stderrErr != nil {
+	if stderrErr != nil && !isBenignPipeReadError(stderrErr) {
 		return nil, fmt.Errorf("failed to read stderr: %w", stderrErr)
 	}
 
@@ -208,6 +283,18 @@ func readAll(r interface{ Read([]byte) (int, error) }) ([]byte, error) {
 	return buf, nil
 }
 
+// isBenignPipeReadError treats EOF-like pipe close races as non-fatal.
+func isBenignPipeReadError(err error) bool {
+	if err == nil {
+		return false
+	}
+	if errors.Is(err, io.EOF) || errors.Is(err, os.ErrClosed) || errors.Is(err, io.ErrClosedPipe) {
+		return true
+	}
+	// Some platforms return wrapped messages that don't map cleanly to sentinel errors.
+	return strings.Contains(strings.ToLower(err.Error()), "file already closed")
+}
+
 // LogSender is a function type for sending logs
 type LogSender func(taskID int, level types.LogLevel, message string, stepName string)