feat(forms): merge notes tab into main info for activity and deal forms; show activity hashtags

- Activity form: notes/tags card inline, live hashtag preview, focus notes when required
- Hashtags shown in activity detail (clickable search) and list rows; search accepts #tag
- Deal form: remove mobile tabs

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/activities/activities.service.ts

@@ -628,7 +628,7 @@ export class ActivitiesService {
     const search = buildSearchWhere<Prisma.ActivityWhereInput>(q, (t) => [
       { title: ci(t) },
       { description: ci(t) },
-      { tags: { has: t } },
+      { tags: { has: t.replace(/^#/, '') } },
       {
         person: {
           OR: [