fix: Improve validation errors in Crawlee CLI (#1140)

### Description

- Add checks to ensure that the selected package manager is installed
and executable.
- Suppress cookie-cutter logs when a failure occurs.

### Issues

- Closes: #1138

Author: vdusek

Diff for: src/crawlee/_cli.py

@@ -3,6 +3,7 @@
 
 import importlib.resources
 import json
+import sys
 from pathlib import Path
 from typing import Annotated, Optional, cast
 
@@ -199,19 +200,32 @@ def create(
                 TextColumn('[progress.description]{task.description}'),
                 transient=True,
             ) as progress:
-                progress.add_task(description='Bootstrapping...', total=None)
-                cookiecutter(
-                    template=str(template_directory),
-                    no_input=True,
-                    extra_context={
-                        'project_name': project_name,
-                        'package_manager': package_manager,
-                        'crawler_type': crawler_type,
-                        'http_client': http_client,
-                        'enable_apify_integration': enable_apify_integration,
-                        'start_url': start_url,
-                    },
-                )
+                bootstrap_task = progress.add_task(description='Bootstrapping...', total=None)
+
+                try:
+                    cookiecutter(
+                        template=str(template_directory),
+                        no_input=True,
+                        extra_context={
+                            'project_name': project_name,
+                            'package_manager': package_manager,
+                            'crawler_type': crawler_type,
+                            'http_client': http_client,
+                            'enable_apify_integration': enable_apify_integration,
+                            'start_url': start_url,
+                        },
+                    )
+                except Exception as exc:
+                    progress.update(bootstrap_task, visible=False)
+                    progress.refresh()
+
+                    # Print just the last line of the error message (the actual error without traceback)
+                    if 'Hook script failed' in str(exc):
+                        typer.echo('Project creation failed. Check the error message above.', err=True)
+                    else:
+                        typer.echo(f'Project creation failed: {exc!s}', err=True)
+
+                    sys.exit(1)
 
             typer.echo(f'Your project "{project_name}" was created.')
 

Diff for: src/crawlee/project_template/hooks/pre_gen_project.py

@@ -1,6 +1,8 @@
 # % if cookiecutter.package_manager in ['poetry', 'uv']
 import subprocess
+import shutil
 import re
+import sys
 
 manager = "{{cookiecutter.package_manager}}"
 manager_text = manager.title()
@@ -12,10 +14,20 @@
 r_version = '0.x'
 # % endif
 
+# Check if package manager is available in PATH
+if not shutil.which(manager):
+    sys.stderr.write(f'\nError: You selected {manager_text} as your package manager, but it is not installed. Please install it and try again.\n')
+    sys.exit(1)
+
+# Check if the package manager is executable
 try:
     version = subprocess.check_output([manager, '--version']).decode().strip()
-except OSError as exc:
-    raise RuntimeError(f'You chose to use the {manager_text} package manager, but it does not seem to be installed') from exc
+except OSError:
+    sys.stderr.write(f'\nError: Your selected package manager {manager_text} was found but failed to execute.\n')
+    sys.exit(1)
+
+# Check if the version matches the required regex
 if not re.match(version_regex, version):
-    raise RuntimeError(f'{manager_text} {r_version} is required, but "{version}" is installed')
+    sys.stderr.write(f'\nError: Your selected package manager {manager_text} requires version {r_version}, but {version} is installed.\n')
+    sys.exit(1)
 # % endif