chore: fix lint errors and reduce warnings across codebase (#234)

* chore: fix lint errors and reduce warnings across codebase

- Fix noExplicitAny catches in backend routes and plugins
- Fix noNestedTernary issues in backend services
- Add keyboard event handlers for useKeyWithClickEvents in frontend
- Disable noImportantStyles rule in biome.json
- Fix formatting errors across all changed files
- Fix test file lint issues

Closes #233

* fix: restore any types in test files for TS compatibility

* fix: revert Auth.tsx dependency array changes that caused infinite re-render

* fix: null-safe user.username access in AppContext dependency array

frontend/src/test/utils/schedule.test.ts

@@ -1892,11 +1892,8 @@ function groupEventsIntoPastDays(
 		const medMap = dayMap.get(dateKey)!;
 		if (!medMap.has(event.medName)) medMap.set(event.medName, []);
 		// Mirror AppContext normalization: string|null → string[]
-		const takenBy = Array.isArray(event.takenBy)
-			? event.takenBy
-			: typeof event.takenBy === "string"
-				? [event.takenBy]
-				: [];
+		const singleOrEmpty = typeof event.takenBy === "string" ? [event.takenBy] : [];
+		const takenBy = Array.isArray(event.takenBy) ? event.takenBy : singleOrEmpty;
 		medMap.get(event.medName)!.push({ id: event.id, takenBy });
 	}