feat(recipes): add local search (FTS5 bm25) and action handlers

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

src/lib/server/recipes/search-local.ts

@@ -0,0 +1,74 @@
+import type Database from 'better-sqlite3';
+
+export type SearchHit = {
+  id: number;
+  title: string;
+  description: string | null;
+  image_path: string | null;
+  source_domain: string | null;
+  avg_stars: number | null;
+  last_cooked_at: string | null;
+};
+
+function escapeFtsTerm(term: string): string {
+  // FTS5 requires double-quoting to treat as a literal phrase; escape inner quotes by doubling
+  return `"${term.replace(/"/g, '""')}"`;
+}
+
+function buildFtsQuery(q: string): string | null {
+  const tokens = q
+    .trim()
+    .split(/\s+/)
+    .filter(Boolean)
+    .map(escapeFtsTerm);
+  if (tokens.length === 0) return null;
+  // prefix-match each token
+  return tokens.map((t) => `${t}*`).join(' ');
+}
+
+export function searchLocal(
+  db: Database.Database,
+  query: string,
+  limit = 30
+): SearchHit[] {
+  const fts = buildFtsQuery(query);
+  if (!fts) return [];
+
+  // bm25: lower is better. Use weights: title > tags > ingredients > description
+  return db
+    .prepare(
+      `SELECT r.id,
+              r.title,
+              r.description,
+              r.image_path,
+              r.source_domain,
+              (SELECT AVG(stars) FROM rating WHERE recipe_id = r.id) AS avg_stars,
+              (SELECT MAX(cooked_at) FROM cooking_log WHERE recipe_id = r.id) AS last_cooked_at
+         FROM recipe r
+         JOIN recipe_fts f ON f.rowid = r.id
+        WHERE recipe_fts MATCH ?
+        ORDER BY bm25(recipe_fts, 10.0, 0.5, 2.0, 5.0)
+        LIMIT ?`
+    )
+    .all(fts, limit) as SearchHit[];
+}
+
+export function listRecentRecipes(
+  db: Database.Database,
+  limit = 12
+): SearchHit[] {
+  return db
+    .prepare(
+      `SELECT r.id,
+              r.title,
+              r.description,
+              r.image_path,
+              r.source_domain,
+              (SELECT AVG(stars) FROM rating WHERE recipe_id = r.id) AS avg_stars,
+              (SELECT MAX(cooked_at) FROM cooking_log WHERE recipe_id = r.id) AS last_cooked_at
+         FROM recipe r
+        ORDER BY r.created_at DESC
+        LIMIT ?`
+    )
+    .all(limit) as SearchHit[];
+}