chore: enable strict mypy checks and fix pre-commit mypy hook

Add type annotations to all previously untyped functions and remove 9
suppressed error codes (call-arg, assignment, return-value, operator,
has-type, dict-item, misc, list-item, annotation-unchecked) by fixing
the underlying type issues.

Add [[tool.mypy.overrides]] with ignore_missing_imports for KiCAD-specific
modules (pcbnew, sexpdata, skip, cairosvg, kipy, PIL) so the pre-commit
mypy hook passes in its isolated venv. Add types-requests and pytest to
additional_dependencies in .pre-commit-config.yaml.

Also fixes several real bugs uncovered by stricter checks: incorrect static
calls to instance methods in swig_backend, wrong return type on get_size,
missing value param in BoardAPI.place_component, variable shadowing in
kicad_process.py, unqualified LibraryManager reference in kicad_interface,
and missing top-level Path import.

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

python/resources/resource_definitions.py

@@ -72,7 +72,7 @@ RESOURCE_DEFINITIONS = [
 # =============================================================================
 
 
-def handle_resource_read(uri: str, interface) -> Dict[str, Any]:
+def handle_resource_read(uri: str, interface: Any) -> Dict[str, Any]:
     """
     Handle reading a resource by URI
 
@@ -116,7 +116,7 @@ def handle_resource_read(uri: str, interface) -> Dict[str, Any]:
 # =============================================================================
 
 
-def _get_project_info(interface) -> Dict[str, Any]:
+def _get_project_info(interface: Any) -> Dict[str, Any]:
     """Get current project information"""
     result = interface.project_commands.get_project_info({})
 
@@ -142,7 +142,7 @@ def _get_project_info(interface) -> Dict[str, Any]:
         }
 
 
-def _get_board_info(interface) -> Dict[str, Any]:
+def _get_board_info(interface: Any) -> Dict[str, Any]:
     """Get board properties and metadata"""
     result = interface.board_commands.get_board_info({})
 
@@ -168,7 +168,7 @@ def _get_board_info(interface) -> Dict[str, Any]:
         }
 
 
-def _get_components(interface) -> Dict[str, Any]:
+def _get_components(interface: Any) -> Dict[str, Any]:
     """Get list of all components"""
     result = interface.component_commands.get_component_list({})
 
@@ -197,7 +197,7 @@ def _get_components(interface) -> Dict[str, Any]:
         }
 
 
-def _get_nets(interface) -> Dict[str, Any]:
+def _get_nets(interface: Any) -> Dict[str, Any]:
     """Get list of electrical nets"""
     result = interface.routing_commands.get_nets_list({})
 
@@ -224,7 +224,7 @@ def _get_nets(interface) -> Dict[str, Any]:
         }
 
 
-def _get_layers(interface) -> Dict[str, Any]:
+def _get_layers(interface: Any) -> Dict[str, Any]:
     """Get layer stack information"""
     result = interface.board_commands.get_layer_list({})
 
@@ -251,7 +251,7 @@ def _get_layers(interface) -> Dict[str, Any]:
         }
 
 
-def _get_design_rules(interface) -> Dict[str, Any]:
+def _get_design_rules(interface: Any) -> Dict[str, Any]:
     """Get design rule settings"""
     result = interface.design_rule_commands.get_design_rules({})
 
@@ -277,7 +277,7 @@ def _get_design_rules(interface) -> Dict[str, Any]:
         }
 
 
-def _get_drc_report(interface) -> Dict[str, Any]:
+def _get_drc_report(interface: Any) -> Dict[str, Any]:
     """Get DRC violations"""
     result = interface.design_rule_commands.get_drc_violations({})
 
@@ -313,7 +313,7 @@ def _get_drc_report(interface) -> Dict[str, Any]:
         }
 
 
-def _get_board_preview(interface) -> Dict[str, Any]:
+def _get_board_preview(interface: Any) -> Dict[str, Any]:
     """Get board preview as PNG image"""
     result = interface.board_commands.get_board_2d_view({"width": 800, "height": 600})