feat(planner): add MealActionSheet component for mobile swap trigger

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

frontend/src/lib/planner/MealActionSheet.svelte

@@ -0,0 +1,111 @@
+<script lang="ts">
+  interface SlotRecipe {
+    id: string;
+    name: string;
+    effort?: string;
+    cookTimeMin?: number;
+  }
+
+  interface Slot {
+    id?: string;
+    slotDate?: string;
+    recipe: SlotRecipe | null;
+  }
+
+  interface Props {
+    open: boolean;
+    slot: Slot;
+    onswap: () => void;
+    oncancel: () => void;
+  }
+
+  let { open, slot, onswap, oncancel }: Props = $props();
+
+  const meta = $derived.by(() => {
+    const parts: string[] = [];
+    if (slot.recipe?.cookTimeMin != null) parts.push(`${slot.recipe.cookTimeMin} min`);
+    if (slot.recipe?.effort) parts.push(slot.recipe.effort);
+    return parts.join(' · ');
+  });
+
+  $effect(() => {
+    if (!open) return;
+
+    function handleKeydown(e: KeyboardEvent) {
+      if (e.key === 'Escape') oncancel();
+    }
+
+    window.addEventListener('keydown', handleKeydown);
+    return () => window.removeEventListener('keydown', handleKeydown);
+  });
+</script>
+
+{#if open}
+  <!-- svelte-ignore a11y_click_events_have_key_events -->
+  <div
+    role="presentation"
+    data-testid="sheet-backdrop"
+    style="position:fixed;inset:0;z-index:50;background:rgba(28,28,24,0.4)"
+    onclick={oncancel}
+  >
+    <div
+      role="dialog"
+      aria-modal="true"
+      tabindex="-1"
+      style="position:absolute;bottom:0;left:0;right:0;background:var(--color-page);border-radius:var(--radius-xl) var(--radius-xl) 0 0;box-shadow:var(--shadow-overlay)"
+      onclick={(e) => e.stopPropagation()}
+    >
+      <!-- Drag handle -->
+      <div style="display:flex;justify-content:center;margin-top:12px">
+        <div style="width:32px;height:4px;background:var(--color-border);border-radius:9999px"></div>
+      </div>
+
+      <!-- Meal title -->
+      <p style="font-family:var(--font-display);font-size:15px;font-weight:500;color:var(--color-text);padding:0 16px;margin:12px 0 4px">
+        {slot.recipe?.name ?? ''}
+      </p>
+
+      <!-- Metadata -->
+      {#if meta}
+        <p style="font-family:var(--font-sans);font-size:11px;color:var(--color-text-muted);padding:0 16px 12px;margin:0">
+          {meta}
+        </p>
+      {/if}
+
+      <!-- Actions -->
+      <div style="padding:0 16px 16px;display:flex;flex-direction:column;gap:6px">
+        <button
+          type="button"
+          style="width:100%;background:var(--orange-tint);border:1px solid #FBCDA4;color:var(--orange-dark);font-family:var(--font-sans);font-size:13px;font-weight:500;border-radius:var(--radius-lg);padding:12px;text-align:center;cursor:pointer"
+          onclick={onswap}
+        >
+          ↻ Swap this meal
+        </button>
+
+        {#if slot.recipe}
+          <a
+            href="/recipes/{slot.recipe.id}/cook"
+            style="display:block;width:100%;background:var(--green-tint);border:1px solid var(--green-light);color:var(--green-dark);font-family:var(--font-sans);font-size:13px;font-weight:500;border-radius:var(--radius-lg);padding:12px;text-align:center;box-sizing:border-box;text-decoration:none"
+          >
+            🍳 Cook now
+          </a>
+
+          <a
+            href="/recipes/{slot.recipe.id}"
+            style="display:block;width:100%;background:var(--color-subtle);border:1px solid var(--color-border);color:var(--color-text-muted);font-family:var(--font-sans);font-size:13px;font-weight:500;border-radius:var(--radius-lg);padding:12px;text-align:center;box-sizing:border-box;text-decoration:none"
+          >
+            👁 View recipe
+          </a>
+        {/if}
+
+        <button
+          type="button"
+          style="width:100%;background:none;border:none;color:var(--color-text-muted);font-family:var(--font-sans);font-size:13px;text-align:center;cursor:pointer;padding:12px"
+          onclick={oncancel}
+        >
+          Cancel
+        </button>
+      </div>
+    </div>
+  </div>
+{/if}