refactor(planner): type tag mapping callback as TagItem in server load

Replaces (t: any) with (t: TagItem) so the API response shape is
validated against the shared TagItem interface.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/(app)/planner/+page.server.ts

@@ -2,6 +2,7 @@ import type { PageServerLoad, Actions } from './$types';
 import { apiClient } from '$lib/server/api';
 import { getWeekStart } from '$lib/planner/week';
 import { addSlotAction, updateSlotAction, deleteSlotAction } from '$lib/server/slotActions';
+import type { TagItem } from '$lib/planner/types';
 
 export const load: PageServerLoad = async ({ fetch, url }) => {
 	const weekParam = url.searchParams.get('week');
@@ -22,7 +23,7 @@ export const load: PageServerLoad = async ({ fetch, url }) => {
 					cookTimeMin: r.cookTimeMin,
 					effort: r.effort,
 					heroImageUrl: r.heroImageUrl,
-					tags: (r.tags ?? []).map((t: any) => ({ id: t.id, name: t.name, tagType: t.tagType }))
+					tags: (r.tags ?? []).map((t: TagItem) => ({ id: t.id, name: t.name, tagType: t.tagType }))
 				}));
 
 	if (weekPlanResult.error || !weekPlanResult.data?.id) {