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/components/search/command-search.tsx

@@ -53,7 +53,7 @@ export function CommandSearch() {
       setFocused(false);
       setQuery('');
       inputRef.current?.blur();
-      router.push(path as any);
+      router.push(path);
     },
     [router],
   );