feat: add title-only search mode

Adds a titleOnly flag to page search: the Postgres driver matches
titles via trigram-indexed unaccented LIKE ranked by word_similarity,
and a Match filter in the search spotlight switches between everything
and title-only matching.

apps/server/src/core/search/dto/search.dto.ts

@@ -30,6 +30,10 @@ export class SearchDTO {
   @IsUUID('all', { each: true })
   labelIds?: string[];
 
+  @IsOptional()
+  @IsBoolean()
+  titleOnly?: boolean;
+
   @IsOptional()
   @IsNumber()
   limit?: number;

apps/server/src/core/search/search.service.ts

@@ -36,6 +36,21 @@ export class SearchService {
     }
     const searchQuery = tsquery(query.trim() + '*');
     const labelIds = [...new Set(searchParams.labelIds ?? [])];
+    const titleOnly = searchParams.titleOnly === true;
+    const titleQuery = query.trim();
+
+    const rankColumn = titleOnly
+      ? sql<number>`word_similarity(lower(f_unaccent(${titleQuery})), lower(f_unaccent(pages.title)))`.as(
+          'rank',
+        )
+      : sql<number>`ts_rank(tsv, to_tsquery('english', f_unaccent(${searchQuery})))`.as(
+          'rank',
+        );
+    const highlightColumn = titleOnly
+      ? sql<string>`''`.as('highlight')
+      : sql<string>`ts_headline('english', text_content, to_tsquery('english', f_unaccent(${searchQuery})),'MinWords=9, MaxWords=10, MaxFragments=3')`.as(
+          'highlight',
+        );
 
     let queryResults = this.db
       .selectFrom('pages')
@@ -48,17 +63,24 @@ export class SearchService {
         'creatorId',
         'createdAt',
         'updatedAt',
-        sql<number>`ts_rank(tsv, to_tsquery('english', f_unaccent(${searchQuery})))`.as(
-          'rank',
-        ),
-        sql<string>`ts_headline('english', text_content, to_tsquery('english', f_unaccent(${searchQuery})),'MinWords=9, MaxWords=10, MaxFragments=3')`.as(
-          'highlight',
-        ),
+        rankColumn,
+        highlightColumn,
       ])
-      .where(
-        'tsv',
-        '@@',
-        sql<string>`to_tsquery('english', f_unaccent(${searchQuery}))`,
+      .$if(!titleOnly, (qb) =>
+        qb.where(
+          'tsv',
+          '@@',
+          sql<string>`to_tsquery('english', f_unaccent(${searchQuery}))`,
+        ),
+      )
+      .$if(titleOnly, (qb) =>
+        qb.where((eb) =>
+          eb(
+            sql`lower(f_unaccent(pages.title))`,
+            'like',
+            sql`lower(f_unaccent(${`%${titleQuery}%`}))`,
+          ),
+        ),
       )
       .$if(Boolean(searchParams.creatorId), (qb) =>
         qb.where('creatorId', '=', searchParams.creatorId),

apps/server/src/database/migrations/20260824T211732-page-title-trgm-index.ts

@@ -0,0 +1,11 @@
+import { type Kysely, sql } from 'kysely';
+
+export async function up(db: Kysely<any>): Promise<void> {
+  await sql`CREATE INDEX IF NOT EXISTS pages_title_trgm_idx ON pages USING gin (lower(f_unaccent(title)) gin_trgm_ops)`.execute(
+    db,
+  );
+}
+
+export async function down(db: Kysely<any>): Promise<void> {
+  await sql`DROP INDEX IF EXISTS pages_title_trgm_idx`.execute(db);
+}