fix(build): resolve TypeScript errors and add missing dependencies

- Add missing zustand dependency to package.json
- Fix unused variable errors in ToolWidgets.tsx
- Remove invalid 'white' theme comparison in claudeSyntaxTheme.ts
- Add proper TypeScript types to stores using StateCreator pattern
- Add null checks and type casting in Settings.tsx filter operations
- Add onChange handler to Switch component to suppress React warning
- Add 'check' script for TypeScript validation

These changes ensure the TypeScript build passes without errors.

src/components/Settings.tsx

@@ -170,12 +170,12 @@ export const Settings: React.FC<SettingsProps> = ({
       const updatedSettings: ClaudeSettings = {
         ...settings,
         permissions: {
-          allow: allowRules.map(rule => rule.value).filter(v => v.trim()),
-          deny: denyRules.map(rule => rule.value).filter(v => v.trim()),
+          allow: allowRules.map(rule => rule.value).filter(v => v && String(v).trim()),
+          deny: denyRules.map(rule => rule.value).filter(v => v && String(v).trim()),
         },
         env: envVars.reduce((acc, { key, value }) => {
-          if (key.trim() && value.trim()) {
-            acc[key] = value;
+          if (key && String(key).trim() && value && String(value).trim()) {
+            acc[key] = String(value);
           }
           return acc;
         }, {} as Record<string, string>),