feat: journal dashboard widgets, agent polish, and edit-mode live previews

Journal dashboard widgets and quick-add; rich-text quick-add dialogs.

Dashboard draft sync for live edit previews; assistant bubble + API tools.

Journal UX: stress slider, mood grid, query cap fix.

src/modules/_core/schema.ts

@@ -35,6 +35,7 @@ export const users = pgTable("users", {
   notifPush: boolean("notif_push").notNull().default(true),
   notifInApp: boolean("notif_inapp").notNull().default(true),
   notifNtfy: boolean("notif_ntfy").notNull().default(false),
+  assistantEnabled: boolean("assistant_enabled").notNull().default(false),
   createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
 });