fix: Resolve all linting errors from ruff

Fix 145 linting errors across CLI refactor code:

Type annotation modernization (Python 3.9+):
- Replace typing.Dict with dict
- Replace typing.List with list
- Replace typing.Set with set
- Replace Optional[X] with X | None

Code quality improvements:
- Remove trailing whitespace (W291)
- Remove whitespace from blank lines (W293)
- Remove unused imports (F401)
- Use dictionary lookup instead of if-elif chains (SIM116)
- Combine nested if statements (SIM102)

Files fixed (45 files):
- src/skill_seekers/cli/arguments/*.py (10 files)
- src/skill_seekers/cli/parsers/*.py (24 files)
- src/skill_seekers/cli/presets/*.py (4 files)
- src/skill_seekers/cli/create_command.py
- src/skill_seekers/cli/source_detector.py
- src/skill_seekers/cli/github_scraper.py
- tests/test_*.py (5 test files)

All files now pass ruff linting checks.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/test_source_detector.py

@@ -9,13 +9,10 @@ Tests the SourceDetector class's ability to identify and parse:
 """
 
 import os
-import tempfile
 import pytest
-from pathlib import Path
 
 from skill_seekers.cli.source_detector import SourceDetector, SourceInfo
 
-
 class TestWebDetection:
     """Test web URL detection."""
 
@@ -58,7 +55,6 @@ class TestWebDetection:
         assert info.type == 'web'
         assert info.suggested_name == 'vue'
 
-
 class TestGitHubDetection:
     """Test GitHub repository detection."""
 
@@ -97,7 +93,6 @@ class TestGitHubDetection:
         assert info.parsed['repo'] == "microsoft/vscode-python"
         assert info.suggested_name == 'vscode-python'
 
-
 class TestLocalDetection:
     """Test local directory detection."""
 
@@ -136,7 +131,6 @@ class TestLocalDetection:
         assert info.type == 'local'
         assert info.parsed['directory'] == cwd
 
-
 class TestPDFDetection:
     """Test PDF file detection."""
 
@@ -160,7 +154,6 @@ class TestPDFDetection:
         assert info.type == 'pdf'
         assert info.suggested_name == 'my-awesome-guide'
 
-
 class TestConfigDetection:
     """Test config file detection."""
 
@@ -178,7 +171,6 @@ class TestConfigDetection:
         assert info.parsed['config_path'] == "configs/django.json"
         assert info.suggested_name == 'django'
 
-
 class TestValidation:
     """Test source validation."""
 
@@ -246,7 +238,6 @@ class TestValidation:
             )
             SourceDetector.validate_source(info)
 
-
 class TestAmbiguousCases:
     """Test handling of ambiguous inputs."""
 
@@ -277,7 +268,6 @@ class TestAmbiguousCases:
         # Should detect as local directory, not web
         assert info.type == 'local'
 
-
 class TestRawInputPreservation:
     """Test that raw_input is preserved correctly."""
 
@@ -302,7 +292,6 @@ class TestRawInputPreservation:
         info = SourceDetector.detect(original)
         assert info.raw_input == original
 
-
 class TestEdgeCases:
     """Test edge cases and corner cases."""