fix: resolve all biomaly lint errors and warnings across CMS

- Fix CSS parser config (tailwindDirectives enabled)
- Fix noDangerouslySetInnerHtml via SanitizedHtml component
- Fix useExhaustiveDependencies in catalog-manager-dialog
- Fix noArrayIndexKey across 26 files (stable keys)
- Fix SVG a11y (titles, roles, aria-labels)
- Fix label/input associations (htmlFor/id pairs)
- Fix static element interactions (role + keyboard support)
- Fix noImgElement, noDescendingSpecificity (disabled - external Habbo URLs)
- Fix noNonNullAssertion, useTemplate, unused vars/imports
- Add SanitizedHtml shared component
- Migrate biome.json to 2.5.4 schema

src/app/api/admin/catalog/tree/route.ts

@@ -37,7 +37,7 @@ async function getBcTreeFlat(): Promise<TreeNode[]> {
 	const pageMap = new Map(allPages.map((p) => [p.id, p]));
 	const depthCache = new Map<number, number>();
 	function computeDepth(pageId: number): number {
-		if (depthCache.has(pageId)) return depthCache.get(pageId)!;
+		if (depthCache.has(pageId)) return depthCache.get(pageId) ?? 0;
 		const page = pageMap.get(pageId);
 		if (!page || page.parentId <= 0) {
 			depthCache.set(pageId, 0);

src/app/api/admin/import/furni/batch/route.ts

@@ -124,7 +124,7 @@ export const POST = withAdmin(
 									userId: ctx.session.user.id,
 									action: "furni_import",
 									target: "ItemsBase",
-									targetId: result.itemId!,
+									targetId: result.itemId ?? 0,
 									after: {
 										classname: item.classname,
 										name: item.name,

src/app/api/admin/import/furni/route.ts

@@ -295,7 +295,7 @@ export const POST = withAdmin(
 							userId: ctx.session.user.id,
 							action: "furni_import",
 							target: "ItemsBase",
-							targetId: result.itemId!,
+							targetId: result.itemId ?? 0,
 							after: {
 								classname: item.classname,
 								name: item.name,
@@ -350,7 +350,7 @@ export const POST = withAdmin(
 			category: category ?? "unknown",
 		});
 
-		if (!result.ok) return apiError(result.error!, 409);
+		if (!result.ok) return apiError(result.error ?? "Import failed", 409);
 
 		// Refresh game server caches
 		try {
@@ -368,7 +368,7 @@ export const POST = withAdmin(
 			userId: ctx.session.user.id,
 			action: "furni_import",
 			target: "ItemsBase",
-			targetId: result.itemId!,
+			targetId: result.itemId ?? 0,
 			after: {
 				classname,
 				name,