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/components/Lightbox.tsx

@@ -19,12 +19,24 @@ export function Lightbox({ src, alt, onClose }: LightboxProps) {
 	}
 
 	return (
-		<div className="lightbox-overlay" onClick={handleOverlayClick}>
+		<div
+			className="lightbox-overlay"
+			onClick={handleOverlayClick}
+			onKeyDown={(e) => {
+				if (e.key === "Escape") onClose();
+			}}
+		>
 			<div className="lightbox-container">
 				<button className="lightbox-close" onClick={onClose}>
 					×
 				</button>
-				<img src={src} alt={alt} className="lightbox-image" onClick={(e) => e.stopPropagation()} />
+				<img
+					src={src}
+					alt={alt}
+					className="lightbox-image"
+					onClick={(e) => e.stopPropagation()}
+					onKeyDown={(e) => e.stopPropagation()}
+				/>
 			</div>
 		</div>
 	);