feat(db): recordView/listViews fuer recipe_view

INSERT OR REPLACE fuer idempotenten Bump des last_viewed_at Timestamps.
listViews-Helper nur fuer Tests; Sort-Query laeuft direkt in
listAllRecipesPaginated via LEFT JOIN.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/server/recipes/views.ts

@@ -0,0 +1,35 @@
+import type Database from 'better-sqlite3';
+
+export function recordView(
+  db: Database.Database,
+  profileId: number,
+  recipeId: number
+): void {
+  // INSERT OR REPLACE re-fires the DEFAULT (CURRENT_TIMESTAMP) on conflict,
+  // so subsequent views of the same recipe by the same profile bump the
+  // timestamp without breaking the composite PK.
+  db.prepare(
+    `INSERT OR REPLACE INTO recipe_view (profile_id, recipe_id)
+     VALUES (?, ?)`
+  ).run(profileId, recipeId);
+}
+
+export type ViewRow = {
+  profile_id: number;
+  recipe_id: number;
+  last_viewed_at: string;
+};
+
+export function listViews(
+  db: Database.Database,
+  profileId: number
+): ViewRow[] {
+  return db
+    .prepare(
+      `SELECT profile_id, recipe_id, last_viewed_at
+         FROM recipe_view
+        WHERE profile_id = ?
+        ORDER BY last_viewed_at DESC`
+    )
+    .all(profileId) as ViewRow[];
+}