refactor(planner): extract Suggestion type to $lib/planner/types.ts

Removes the inline interface from RecipePicker.svelte and replaces
any[] in +page.svelte with Suggestion[] — compile-time safety.

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

frontend/src/lib/planner/RecipePicker.svelte

@@ -1,16 +1,5 @@
 <script lang="ts">
-	interface Recipe {
-		id: string;
-		name: string;
-		effort?: string;
-		cookTimeMin?: number;
-	}
-
-	interface Suggestion {
-		recipe: Recipe;
-		scoreDelta: number;
-		hasConflict: boolean;
-	}
+	import type { Recipe, Suggestion } from '$lib/planner/types';
 
 	let {
 		planId,

frontend/src/lib/planner/types.ts

@@ -0,0 +1,12 @@
+export interface Recipe {
+	id: string;
+	name: string;
+	effort?: string;
+	cookTimeMin?: number;
+}
+
+export interface Suggestion {
+	recipe: Recipe;
+	scoreDelta: number;
+	hasConflict: boolean;
+}