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/knowledge/index.ts

@@ -7,3 +7,4 @@ export { EntryEditor } from "./EntryEditor";
 export { EntryMetadata } from "./EntryMetadata";
 export { VersionHistory } from "./VersionHistory";
 export { ImportExportActions } from "./ImportExportActions";
+export { StatsDashboard } from "./StatsDashboard";