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/ThreadCard.tsx

@@ -67,7 +67,12 @@ export function ThreadCard({
 			</div>
 			<div className="flex flex-wrap gap-1.5">
 				<span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-blue-50 text-blue-700">
-					<LucideIcon name={categoryIcon} size={16} className="inline-block mr-1 text-gray-500" /> {categoryName}
+					<LucideIcon
+						name={categoryIcon}
+						size={16}
+						className="inline-block mr-1 text-gray-500"
+					/>{" "}
+					{categoryName}
 				</span>
 				<span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-purple-50 text-purple-700">
 					{candidateCount} {candidateCount === 1 ? "candidate" : "candidates"}