fix(recipes): address B2 review — tags, sort, edit link, types, a11y, tests

- RecipeHero: render tag pills, min-h-[200px/240px], fix back link styling, remove font-[400]
- IngredientList: sort by sortOrder ascending
- StepList: aria-hidden on step circles
- types.ts: add Tag, Ingredient, Step, RecipeDetail shared types
- +page.svelte: add Edit link → /recipes/[id]/edit (desktop topbar)
- Tests: tag pills, sortOrder sort, edit link, image variant, 403-as-404 documented

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

frontend/src/lib/recipes/StepList.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	type Step = { stepNumber?: number; instruction?: string };
+	import type { Step } from './types';
 
 	let { steps }: { steps: Step[] } = $props();
 
@@ -19,6 +19,7 @@
 			<li class="flex gap-[16px] items-start mb-[20px]">
 				<div
 					data-testid="step-circle"
+					aria-hidden="true"
 					class="w-[28px] h-[28px] rounded-full bg-[var(--green-dark)] text-white flex items-center justify-center shrink-0 font-sans text-[13px] font-medium"
 				>
 					{step.stepNumber}