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/commands/component_schematic.py

@@ -2,7 +2,7 @@ import logging
 import os
 import uuid
 from pathlib import Path
-from typing import Optional
+from typing import Any, Dict, List, Optional, Tuple
 
 from skip import Schematic
 
@@ -25,7 +25,7 @@ class ComponentManager:
     _dynamic_loader = None
 
     @classmethod
-    def get_dynamic_loader(cls):
+    def get_dynamic_loader(cls) -> Any:
         """Get or create dynamic symbol loader instance"""
         if cls._dynamic_loader is None and DYNAMIC_LOADING_AVAILABLE:
             cls._dynamic_loader = DynamicSymbolLoader()
@@ -86,7 +86,7 @@ class ComponentManager:
         """
 
         # Helper function to check if template exists in schematic
-        def template_exists(schematic, template_ref):
+        def template_exists(schematic: Any, template_ref: str) -> bool:
             """Check if template exists by iterating symbols (handles special characters)"""
             for symbol in schematic.symbol:
                 if (
@@ -165,7 +165,7 @@ class ComponentManager:
     @staticmethod
     def add_component(
         schematic: Schematic, component_def: dict, schematic_path: Optional[Path] = None
-    ):
+    ) -> Any:
         """
         Add a component to the schematic by cloning from template
 
@@ -265,7 +265,7 @@ class ComponentManager:
             raise
 
     @staticmethod
-    def remove_component(schematic: Schematic, component_ref: str):
+    def remove_component(schematic: Schematic, component_ref: str) -> bool:
         """Remove a component from the schematic by reference designator"""
         try:
             # kicad-skip doesn't have a direct remove_symbol method by reference.
@@ -288,7 +288,7 @@ class ComponentManager:
             return False
 
     @staticmethod
-    def update_component(schematic: Schematic, component_ref: str, new_properties: dict):
+    def update_component(schematic: Schematic, component_ref: str, new_properties: dict) -> bool:
         """Update component properties by reference designator"""
         try:
             symbol_to_update = None
@@ -313,7 +313,7 @@ class ComponentManager:
             return False
 
     @staticmethod
-    def get_component(schematic: Schematic, component_ref: str):
+    def get_component(schematic: Schematic, component_ref: str) -> Any:
         """Get a component by reference designator"""
         for symbol in schematic.symbol:
             if symbol.reference == component_ref:
@@ -323,7 +323,7 @@ class ComponentManager:
         return None
 
     @staticmethod
-    def search_components(schematic: Schematic, query: str):
+    def search_components(schematic: Schematic, query: str) -> List[Any]:
         """Search for components matching criteria (basic implementation)"""
         # This is a basic search, could be expanded to use regex or more complex logic
         matching_components = []
@@ -342,7 +342,7 @@ class ComponentManager:
         return matching_components
 
     @staticmethod
-    def get_all_components(schematic: Schematic):
+    def get_all_components(schematic: Schematic) -> List[Any]:
         """Get all components in schematic"""
         logger.debug(f"Retrieving all {len(schematic.symbol)} components.")
         return list(schematic.symbol)