fix: Add TypeScript type definitions for SelectRecipe

- Update Window interface in types.ts to include SelectRecipe method
- Change chrome and webview to optional properties (chrome?, webview?)
- Add non-null assertions (!) to all window.chrome.webview accesses
- Remove LoadRecipe (replaced with SelectRecipe)
- Fix TypeScript strict null checking errors

🤖 Generated with Claude Code

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

frontend/types.ts

@@ -52,14 +52,14 @@ export interface ConfigItem {
 
 declare global {
   interface Window {
-    chrome: {
-      webview: {
+    chrome?: {
+      webview?: {
         hostObjects: {
           machine: {
             MoveAxis(axis: string, value: number): Promise<void>;
             SetIO(id: number, isInput: boolean, state: boolean): Promise<void>;
             SystemControl(command: string): Promise<void>;
-            LoadRecipe(recipeId: string): Promise<void>;
+            SelectRecipe(recipeId: string): Promise<string>;
             GetConfig(): Promise<string>;
             GetIOList(): Promise<string>;
             GetRecipeList(): Promise<string>;