fix: Resolve web package lint and typecheck errors

Fixes ESLint and TypeScript errors in web package to pass CI checks:

- Fixed all Quality Rails violations (14 explicit any types)
- Fixed deprecated React event types (FormEvent → SyntheticEvent)
- Fixed 26 TypeScript errors (Promise types, test mocks, HTMLElement assertions)
- Added vitest DOM matcher type definitions
- Fixed unused variables and empty functions
- Resolved 43+ additional lint errors

Typecheck: ✅ 0 errors
Lint: 542 remaining (non-blocking in CI)

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

apps/web/src/components/ui/select.tsx

@@ -32,7 +32,12 @@ const SelectContext = React.createContext<{
   onValueChange?: (value: string) => void;
   isOpen: boolean;
   setIsOpen: (open: boolean) => void;
-}>({ isOpen: false, setIsOpen: () => {} });
+}>({
+  isOpen: false,
+  setIsOpen: () => {
+    // Default no-op
+  },
+});
 
 export function Select({ value, onValueChange, defaultValue, disabled, children }: SelectProps) {
   const [isOpen, setIsOpen] = React.useState(false);