refactor(planner): import shared types in EmptyDayTile instead of re-declaring

Removes local TagItem, SuggestionRecipe, TopSuggestion, Slot interfaces
and imports Suggestion, SlotMap from types.ts.

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

frontend/src/lib/planner/EmptyDayTile.svelte

@@ -1,32 +1,7 @@
 <script lang="ts">
 	import { computeReasoningTags } from './reasoningTags';
 	import { formatDayAbbr } from '$lib/planner/week';
-
+	import type { Suggestion, SlotMap } from '$lib/planner/types';
-	interface TagItem {
-		id?: string;
-		name?: string;
-		tagType?: string;
-	}
-
-	interface SuggestionRecipe {
-		id: string;
-		name: string;
-		cookTimeMin?: number;
-		effort?: string;
-		tags?: TagItem[];
-	}
-
-	interface TopSuggestion {
-		recipe: SuggestionRecipe;
-		scoreDelta: number;
-		hasConflict: boolean;
-	}
-
-	interface Slot {
-		id?: string;
-		slotDate?: string;
-		recipe?: any | null;
-	}
 
 	let {
 		slotDate,
@@ -39,8 +14,8 @@
 		slotDate: string;
 		slotId: string;
 		isPlanner: boolean;
-		slotMap: Record<string, Slot>;
+		slotMap: SlotMap;
-		topSuggestion?: TopSuggestion;
+		topSuggestion?: Suggestion;
 		onaddrecipe?: () => void;
 	} = $props();