style: sort Python imports with isort

Add isort configuration (profile=black, line_length=100) to pyproject.toml,
add isort pre-commit hook, and auto-sort imports across all Python source files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

python/tests/test_freerouting.py

@@ -15,12 +15,11 @@ from pathlib import Path
 from unittest.mock import MagicMock, patch
 
 import pytest
-
 from commands.freerouting import (
     FreeroutingCommands,
-    _find_java,
-    _find_docker,
     _docker_available,
+    _find_docker,
+    _find_java,
     _java_version_ok,
 )
 

python/tests/test_schematic_analysis.py

@@ -6,11 +6,11 @@ Integration tests parse real .kicad_sch files via sexpdata.
 """
 
 import os
-import sys
 import shutil
+import sys
 import tempfile
 from pathlib import Path
-from unittest.mock import patch, MagicMock
+from unittest.mock import MagicMock, patch
 
 import pytest
 import sexpdata
@@ -20,23 +20,23 @@ from sexpdata import Symbol
 sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
 
 from commands.schematic_analysis import (
-    _parse_wires,
-    _parse_labels,
-    _parse_symbols,
-    _load_sexp,
-    _extract_lib_symbols,
-    _parse_lib_symbol_graphics,
-    _transform_local_point,
-    _line_segment_intersects_aabb,
-    _point_in_rect,
-    _distance,
     _aabb_overlap,
     _check_wire_overlap,
     _compute_symbol_bbox_direct,
+    _distance,
+    _extract_lib_symbols,
+    _line_segment_intersects_aabb,
+    _load_sexp,
+    _parse_labels,
+    _parse_lib_symbol_graphics,
+    _parse_symbols,
+    _parse_wires,
+    _point_in_rect,
+    _transform_local_point,
     compute_symbol_bbox,
     find_overlapping_elements,
-    get_elements_in_region,
     find_wires_crossing_symbols,
+    get_elements_in_region,
 )
 
 # ---------------------------------------------------------------------------

python/tests/test_schematic_component_fields.py

@@ -3,8 +3,8 @@ Tests for get_schematic_component and edit_schematic_component fieldPositions su
 """
 
 import re
-import sys
 import shutil
+import sys
 import tempfile
 from pathlib import Path
 

python/tests/test_schematic_tools.py

@@ -268,7 +268,8 @@ def _make_handler_under_test(handler_name: str):
     This works because every _handle_* method starts with a params dict check
     before doing any file I/O or heavy imports.
     """
-    import importlib.util, types
+    import importlib.util
+    import types
 
     # We monkey-patch sys.modules to avoid pcbnew/skip side effects
     stubs = {}
@@ -301,8 +302,8 @@ class TestHandlerParamValidation:
 
     def _make_iface_stub(self):
         """Return a stub that exposes only the handler methods under test."""
-        import types
         import importlib
+        import types
 
         # Build a minimal namespace that satisfies the imports inside each handler
         stub_mod = types.ModuleType("_handler_stubs")

python/tests/test_wire_junction_changes.py

@@ -119,7 +119,8 @@ class TestHandlerDispatch:
     @pytest.fixture(autouse=True)
     def load_handler_map(self):
         # Import only the dispatch table without initialising KiCAD connections
-        import importlib, types
+        import importlib
+        import types
 
         # Patch heavy imports before loading kicad_interface
         for mod in ["pcbnew", "skip"]:
@@ -334,6 +335,7 @@ class TestPinSnapping:
 
         # Re-import so the patched skip.Schematic is used
         import importlib
+
         import kicad_interface
 
         importlib.reload(kicad_interface)