fix(store): properly handle sql.ErrNoRows in SQLite GetReaction

- Use direct QueryRowContext with proper sql.ErrNoRows handling
- Return nil when reaction is not found (sql.ErrNoRows)
- Return error for other database errors
- More performant than List approach (single row fetch vs list iteration)

store/db/sqlite/reaction.go

@@ -2,6 +2,8 @@ package sqlite
 
 import (
 	"context"
+	"database/sql"
+	"errors"
 	"strings"
 
 	"github.com/usememos/memos/store"
@@ -88,15 +90,43 @@ func (d *DB) ListReactions(ctx context.Context, find *store.FindReaction) ([]*st
 }
 
 func (d *DB) GetReaction(ctx context.Context, find *store.FindReaction) (*store.Reaction, error) {
-	list, err := d.ListReactions(ctx, find)
-	if err != nil {
-		return nil, err
+	where, args := []string{"1 = 1"}, []any{}
+
+	if find.ID != nil {
+		where, args = append(where, "id = ?"), append(args, *find.ID)
 	}
-	if len(list) == 0 {
-		return nil, nil
+	if find.CreatorID != nil {
+		where, args = append(where, "creator_id = ?"), append(args, *find.CreatorID)
+	}
+	if find.ContentID != nil {
+		where, args = append(where, "content_id = ?"), append(args, *find.ContentID)
+	}
+
+	reaction := &store.Reaction{}
+	if err := d.db.QueryRowContext(ctx, `
+		SELECT
+			id,
+			created_ts,
+			creator_id,
+			content_id,
+			reaction_type
+		FROM reaction
+		WHERE `+strings.Join(where, " AND ")+`
+		LIMIT 1`,
+		args...,
+	).Scan(
+		&reaction.ID,
+		&reaction.CreatedTs,
+		&reaction.CreatorID,
+		&reaction.ContentID,
+		&reaction.ReactionType,
+	); err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, nil
+		}
+		return nil, err
 	}
 
-	reaction := list[0]
 	return reaction, nil
 }