fix: resolve CI/CD issues and linting errors

regex_humanizer/parser.py

@@ -1,6 +1,4 @@
-"""Regex parser for converting regex patterns to AST nodes."""
-
-from typing import Optional, Union, Any
+from typing import Optional, Any
 from dataclasses import dataclass, field
 from enum import Enum
 
@@ -355,7 +353,7 @@ class RegexParser:
                     self.pos = end + 1
                     return RegexNode(
                         node_type=NodeType.UNICODE_PROPERTY,
-                        raw=f'\\p{{{prop}}}')
+                        raw=f'\\p{{{prop}}}',
                         position=self.pos - len(f'\\p{{{prop}}}')
                     )
 
@@ -558,7 +556,6 @@ class RegexParser:
                                 is_non_capturing=False
                             )
                 elif next_char in 'iDsx':
-                    flag = next_char
                     self.pos += 1
                     children = self._parse_sequence()
                     return RegexNode(
@@ -592,7 +589,6 @@ class RegexParser:
 
         if char in '*+?':
             self.pos += 1
-            quant_type = char
             if char == '*':
                 min_count = 0
                 max_count = float('inf')
@@ -634,7 +630,6 @@ class RegexParser:
                     is_possessive = True
                 self.pos += 1
 
-            quant_type = '{' + quant_content + '}'
 
         else:
             return None