chore: auto-fix Biome formatting and configure lint rules

Run biome check --write --unsafe to fix tabs, import ordering, and
non-null assertions across entire codebase. Disable a11y rules not
applicable to this single-user app. Exclude auto-generated routeTree.

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

src/client/components/ItemCard.tsx

@@ -107,7 +107,11 @@ export function ItemCard({
 					/>
 				) : (
 					<div className="w-full h-full flex flex-col items-center justify-center">
-						<LucideIcon name={categoryIcon} size={36} className="text-gray-400" />
+						<LucideIcon
+							name={categoryIcon}
+							size={36}
+							className="text-gray-400"
+						/>
 					</div>
 				)}
 			</div>
@@ -127,7 +131,12 @@ export function ItemCard({
 						</span>
 					)}
 					<span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-gray-50 text-gray-600">
-						<LucideIcon name={categoryIcon} size={14} className="inline-block mr-1 text-gray-500" /> {categoryName}
+						<LucideIcon
+							name={categoryIcon}
+							size={14}
+							className="inline-block mr-1 text-gray-500"
+						/>{" "}
+						{categoryName}
 					</span>
 				</div>
 			</div>