feat: Phase 5 - Calendar + Dashboard + Search

Calendar:
- GET /api/domains/[domainId]/calendar/events?from=&to= — returns tasks, habits, projects, milestones
- PATCH /api/domains/[domainId]/tasks/[id]/schedule — drag-to-reschedule with activity feed
- Calendar UI with month/week/day views via react-big-calendar
- Drag-to-reschedule with SSE updates
- Filter by entity type and domain
- Keyboard shortcuts: t=today, m/w/d=view, ←/→=navigate
- Mobile: auto-switches to day view on small screens

Dashboard:
- GET/PUT /api/domains/[domainId]/dashboard — layout stored in domain custom_fields
- 8 per-widget data endpoints (today-tasks, habit-checklist, weekly-stats, project-progress, upcoming-calendar, recent-notes, activity-feed, quick-capture)
- react-grid-layout with responsive breakpoints (12/8/4 cols)
- Drag-to-reorder, resize, add/remove widgets
- Edit mode toggle, per-workspace layout persistence
- Widget error boundary

Search:
- tsvector columns + GIN indexes on tasks, notes, projects, habits, domains
- GET /api/search?q=&types=&domain= — ranked results with ts_headline snippets
- Dedicated search page with grouped results, filters, recent searches (localStorage)
- Empty state with hints

Schema:
- Added custom_fields jsonb column to domains table (migration 0002)
- Removed stale root app/ directory

Build: passes, typecheck: passes, tests: 18/18 wikilink-parser tests pass

packages/db/src/schema.ts

@@ -1,5 +1,6 @@
 import {
   boolean,
+  customType,
   index,
   integer,
   jsonb,
@@ -13,6 +14,13 @@ import {
   uuid,
 } from 'drizzle-orm/pg-core';
 
+// ── Custom tsvector type for full-text search ─────────────────────────────────
+export const tsvector = customType<{ data: string }>({
+  dataType() {
+    return 'tsvector';
+  },
+});
+
 // ── Enums ──────────────────────────────────────────────────────────────────────
 
 export const taskStatusEnum = pgEnum('task_status', ['todo', 'in_progress', 'done', 'cancelled']);
@@ -51,12 +59,15 @@ export const domains = pgTable(
     icon: text('icon'),
     parentId: uuid('parent_id').references((): any => domains.id, { onDelete: 'set null' }),
     sortOrder: integer('sort_order').default(0),
+    customFields: jsonb('custom_fields').$type<Record<string, unknown>>().default({}),
+    searchVector: tsvector('search_vector'),
     createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
     updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
   },
   (table) => [
     index('domains_parent_id_idx').on(table.parentId),
     index('domains_slug_idx').on(table.slug),
+    index('domains_search_idx').using('gin', table.searchVector),
   ]
 );
 
@@ -94,6 +105,7 @@ export const projects = pgTable(
     color: text('color'),
     icon: text('icon'),
     targetDate: timestamp('target_date', { withTimezone: true }),
+    searchVector: tsvector('search_vector'),
     createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
     updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
     deletedAt: timestamp('deleted_at', { withTimezone: true }),
@@ -102,6 +114,7 @@ export const projects = pgTable(
     index('projects_domain_id_idx').on(table.domainId),
     index('projects_status_idx').on(table.status),
     index('projects_deleted_at_idx').on(table.deletedAt),
+    index('projects_search_idx').using('gin', table.searchVector),
   ]
 );
 
@@ -152,6 +165,7 @@ export const tasks = pgTable(
     recurrenceRule: text('recurrence_rule'),
     order: integer('order').default(0),
     customFields: jsonb('custom_fields').$type<Record<string, unknown>>().default({}),
+    searchVector: tsvector('search_vector'),
     createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
     updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
     deletedAt: timestamp('deleted_at', { withTimezone: true }),
@@ -166,6 +180,7 @@ export const tasks = pgTable(
     index('tasks_due_date_idx').on(table.dueDate),
     index('tasks_order_idx').on(table.order),
     index('tasks_deleted_at_idx').on(table.deletedAt),
+    index('tasks_search_idx').using('gin', table.searchVector),
   ]
 );
 
@@ -226,6 +241,7 @@ export const habits = pgTable(
     bestStreak: integer('best_streak').default(0),
     moodTracking: boolean('mood_tracking').default(false),
     active: boolean('active').default(true),
+    searchVector: tsvector('search_vector'),
     createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
     updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
     deletedAt: timestamp('deleted_at', { withTimezone: true }),
@@ -234,6 +250,7 @@ export const habits = pgTable(
     index('habits_domain_id_idx').on(table.domainId),
     index('habits_active_idx').on(table.active),
     index('habits_deleted_at_idx').on(table.deletedAt),
+    index('habits_search_idx').using('gin', table.searchVector),
   ]
 );
 
@@ -289,6 +306,7 @@ export const notes = pgTable(
       .references((): any => domains.id, { onDelete: 'cascade' }),
     isPinned: boolean('is_pinned').default(false),
     isArchived: boolean('is_archived').default(false),
+    searchVector: tsvector('search_vector'),
     createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
     updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
     deletedAt: timestamp('deleted_at', { withTimezone: true }),
@@ -298,6 +316,7 @@ export const notes = pgTable(
     index('notes_is_pinned_idx').on(table.isPinned),
     index('notes_is_archived_idx').on(table.isArchived),
     index('notes_deleted_at_idx').on(table.deletedAt),
+    index('notes_search_idx').using('gin', table.searchVector),
   ]
 );