Fix all ESLint errors: remove unused imports, replace any types

- Remove ~60 unused imports and variables across 88 files
- Replace ~80 `any` type annotations with proper types (unknown,
  Record<string, unknown>, or specific types)
- Prefix unused callback args with underscore
- Fix unescaped JSX entities
- Lint now passes cleanly (0 errors, 2 intentional img warnings)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/hooks/use-entity-options.ts

@@ -48,7 +48,7 @@ export function useEntityOptions({
 
   const options: EntityOption[] = useMemo(() => {
     if (!data) return [];
-    return data.map((item: any) => ({
+    return data.map((item: Record<string, unknown>) => ({
       value: String(item[valueKey]),
       label: String(item[labelKey]),
       ...item,