Fix KiCad WASM build and runtime errors

Build improvements:
- Change -O0 to -O1 to fix "local count too large" asyncify error
- Add wasm-emscripten-finalize to host (Docker OOMs on large WASM)
- Use -gseparate-dwarf for smaller main binary with debug info
- Build native protoc for code generation
- Add more functions to asyncify removelist

Runtime fixes:
- Add inject-dyncall-shims.sh to fix "dynCall_* is not defined" in Emscripten 4.x
- Update wxwidgets with browserInfo.name fix

New stubs and bindings:
- Add Embind bindings for JavaScript interop
- Add stubs for scripting, API plugin, PCB frame, navlib

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

scripts/common/apply-finalize.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+# Apply wasm-emscripten-finalize transformation on host
+# Uses the same Binaryen v121 as wasm-opt to ensure version consistency
+#
+# Usage: ./scripts/common/apply-finalize.sh <input.wasm> <output.wasm>
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/../.." && pwd)"
+
+# Get wasm-emscripten-finalize from same Binaryen install as wasm-opt
+BINARYEN_DIR="${PROJECT_ROOT}/tools/binaryen-121"
+FINALIZE="${BINARYEN_DIR}/bin/wasm-emscripten-finalize"
+
+# Ensure Binaryen is downloaded
+if [ ! -x "${FINALIZE}" ]; then
+    echo "Downloading Binaryen v121..."
+    "${SCRIPT_DIR}/get-wasm-opt.sh" > /dev/null
+fi
+
+INPUT_WASM="${1:-output/pcbnew.wasm}"
+OUTPUT_WASM="${2:-${INPUT_WASM}}"
+
+if [ ! -f "${INPUT_WASM}" ]; then
+    echo "ERROR: Input file not found: ${INPUT_WASM}"
+    exit 1
+fi
+
+echo "Applying wasm-emscripten-finalize..."
+echo "  Input:  ${INPUT_WASM}"
+echo "  Output: ${OUTPUT_WASM}"
+echo "  Tool:   ${FINALIZE}"
+
+# Run finalize with the same flags Emscripten would use
+# NOTE: --dwarf removed because debug info is in separate .debug.wasm file
+"${FINALIZE}" \
+    -g \
+    --bigint \
+    --no-legalize-javascript-ffi \
+    --detect-features \
+    "${INPUT_WASM}" \
+    -o "${OUTPUT_WASM}"
+
+echo "Finalize complete: ${OUTPUT_WASM}"
+ls -lh "${OUTPUT_WASM}"