feat: Add Web Push notifications and multiple UX improvements

- Add PWA manifest and service worker for push notifications
- Implement VAPID key generation and push subscription management
- Add push notification API endpoints (/api/push/*)
- Add push_subscriptions table to database schema
- Update notification settings UI with push support and iOS hints
- Fix translation issue showing "{ task } created" - add missing keys
- Fix mobile sidebar visibility for iOS home screen app
- Change default task filter from "all" to "open" (excludes done tasks)
- Add "Open" filter option to show only todo + inProgress tasks

shared/schema.ts

@@ -524,3 +524,28 @@ export const encouragementLogs = pgTable("encouragement_logs", {
 });
 
 export type EncouragementLog = typeof encouragementLogs.$inferSelect;
+
+// ============================================
+// PUSH NOTIFICATIONS
+// ============================================
+
+// Push Subscriptions - Store Web Push subscriptions for each user/device
+export const pushSubscriptions = pgTable("push_subscriptions", {
+  id: varchar("id").primaryKey().default(sql`gen_random_uuid()`),
+  userId: varchar("user_id").references(() => users.id).notNull(),
+  endpoint: text("endpoint").notNull().unique(),
+  p256dh: text("p256dh").notNull(), // Public key
+  auth: text("auth").notNull(), // Auth secret
+  userAgent: text("user_agent"), // To identify device
+  createdAt: timestamp("created_at").defaultNow(),
+  lastUsedAt: timestamp("last_used_at").defaultNow(),
+});
+
+export const insertPushSubscriptionSchema = createInsertSchema(pushSubscriptions).omit({
+  id: true,
+  createdAt: true,
+  lastUsedAt: true,
+});
+
+export type InsertPushSubscription = z.infer<typeof insertPushSubscriptionSchema>;
+export type PushSubscription = typeof pushSubscriptions.$inferSelect;