docs: add comprehensive product roadmap (5 phases, Option D strategy)

- Phase 1: Web MVP (Next.js 16 PWA) — timer engine, cascade, visual timeline - Phase 2: Intelligence — routines, NL input, focus mode, neurodivergent mode - Phase 3: Apple Native — iOS + Apple Watch + macOS (SwiftUI, not KMP) - Phase 4: Context & Growth — calendar sync, location, sleep, viral mechanics - Phase 5: Android + Scale — Jetpack Compose, Wear OS, shared timers, monetization - Includes: viral playbook, success metrics, risk register, tech stack summary - Checklists for every phase with exit criteria
2026-02-27 17:27:05 -08:00 · 2026-02-27 17:27:05 -08:00 · c02d8cf08c
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+# ChronoMind — Product Roadmap
+
+> **Product:** ChronoMind — AI-Powered Time Awareness Layer
+> **Strategy:** Option D — Web PWA (MVP) → SwiftUI (iOS/Watch/Mac) → Android (v2)
+> **Created:** February 2026
+> **See also:** [PRD.md](PRD.md) | [INDUSTRY_RESEARCH.md](INDUSTRY_RESEARCH.md)
+
+---
+
+## Executive Summary
+
+ChronoMind ships in **5 phases over ~6 months**, from web MVP to full cross-platform product:
+
+| Phase | Timeline | Platform | Goal |
+|-------|----------|----------|------|
+| **Phase 1** | Week 1-2 | Web PWA | Ship MVP — validate core concept |
+| **Phase 2** | Week 3-5 | Web PWA | Intelligence layer — make it smart |
+| **Phase 3** | Week 6-9 | iOS + Apple Watch + macOS | Go native — own the wrist |
+| **Phase 4** | Week 10-14 | All Apple + Web | Context, sync, growth — make it sticky |
+| **Phase 5** | Week 15-22 | + Android + Wear OS | Full platform — scale to everyone |
+
+**North star metric:** Daily Active Users who set a timer with pre-warnings enabled.
+
+---
+
+## Architecture Overview
+
+```
+┌──────────────────────────────────────────────────────────────────────────┐
+│                        ChronoMind Architecture                          │
+├──────────────────────────────────────────────────────────────────────────┤
+│                                                                          │
+│  Track 1: Web (Next.js 16)              Track 2: Apple (SwiftUI)        │
+│  ─────────────────────────              ────────────────────────         │
+│  src/lib/timer-engine.ts   ──port──→    Shared/TimerEngine/*.swift      │
+│  src/lib/cascade.ts        ──port──→    Shared/TimerEngine/Cascade.swift│
+│  src/lib/recurrence.ts     ──port──→    Shared/TimerEngine/Recurrence.  │
+│  src/lib/store.ts (Zustand+IDB)        Shared/Store/ (SwiftData)       │
+│  src/components/ (React)                ChronoMind/ (iOS SwiftUI)       │
+│                                         ChronoMindWatch/ (watchOS)      │
+│                                         ChronoMindMac/ (macOS menu bar) │
+│                                                                          │
+│  Track 3: Android (v2)                                                   │
+│  ──────────────────────                                                  │
+│  TimerEngine/*.kt (Kotlin port)                                         │
+│  UI: Jetpack Compose                                                     │
+│  Watch: Wear OS + Glance widgets                                        │
+│                                                                          │
+│  Shared: Cloud Sync API (optional, E2E encrypted)                       │
+│  Analytics: Plausible / PostHog (privacy-first)                         │
+└──────────────────────────────────────────────────────────────────────────┘
+```
+
+---
+
+## Phase 1: Web MVP — "Make It Work" (Week 1-2)
+
+> **Goal:** Ship a functional PWA that validates the core concept — pre-warning cascades make timers actually useful.
+> **Success criteria:** 10 people use it daily for a week and say "I can't go back to a normal timer."
+
+### Week 1: Foundation + Timer Engine
+
+- [ ] **Project scaffold**
+  - [ ] `npx create-next-app@latest` with Next.js 16, App Router, TypeScript
+  - [ ] TailwindCSS v4 setup + shadcn/ui init + Lucide React icons
+  - [ ] Zustand store with IndexedDB persistence (via `idb`)
+  - [ ] ESLint + Prettier + Vitest config
+  - [ ] Basic folder structure: `app/`, `components/`, `lib/`, `styles/`
+
+- [ ] **Timer engine (`lib/timer-engine.ts`)**
+  - [ ] `Timer` interface with all fields (id, type, label, urgency, targetTime, duration, cascade, etc.)
+  - [ ] Create timer (alarm, countdown, pomodoro)
+  - [ ] Start / pause / resume / cancel countdown
+  - [ ] Timer state machine: `idle → active → warning → firing → snoozed → dismissed`
+  - [ ] `requestAnimationFrame` + `setInterval` dual-loop for accurate countdown
+  - [ ] Unit tests for timer state transitions
+
+- [ ] **Pre-warning cascade (`lib/cascade.ts`)**
+  - [ ] Cascade presets: Relaxed (2h, 1h, 30m), Standard (1h, 30m, 15m, 5m), Tight (30m, 15m, 5m, 1m), Critical (2h, 1h, 30m, 15m, 5m, 1m)
+  - [ ] Custom cascade builder (user picks intervals)
+  - [ ] Cascade scheduler: calculate all warning timestamps from target time
+  - [ ] Cascade state tracking: which warnings have fired
+  - [ ] Unit tests for cascade calculation edge cases (past warnings, overlapping, etc.)
+
+- [ ] **Urgency system (`lib/urgency.ts`)**
+  - [ ] 5 levels: Critical, Important, Standard, Gentle, Passive
+  - [ ] Each level maps to: notification style, sound, vibration, visual intensity, snooze behavior
+  - [ ] Critical: persistent sound, full-screen overlay, no auto-dismiss
+  - [ ] Passive: badge only, no sound
+
+- [ ] **Visual timeline dashboard (`components/Timeline.tsx`)**
+  - [ ] Vertical timeline showing all timers for today/upcoming
+  - [ ] Color-coded by urgency level
+  - [ ] Current time marker with smooth animation
+  - [ ] Pre-warning markers on timeline (small dots before each timer)
+  - [ ] Tap timer → expand to show details
+  - [ ] Empty state: "Your day is clear — set your first timer"
+
+- [ ] **Create timer flow (`app/(app)/create/`)**
+  - [ ] Quick timer: one-tap presets (5m, 15m, 25m Pomodoro, 1h)
+  - [ ] Alarm: date + time picker, label, urgency dropdown, cascade preset
+  - [ ] Countdown: duration picker (hours, minutes, seconds), label, urgency
+  - [ ] Form validation with Zod
+  - [ ] Save to Zustand store → IndexedDB
+
+- [ ] **Large digital clock (`components/Clock.tsx`)**
+  - [ ] Current time with seconds, subtle glow effect
+  - [ ] Date display below
+  - [ ] Next timer countdown shown prominently
+  - [ ] Responsive: hero on landing, compact in app header
+
+### Week 2: Notifications + Polish
+
+- [ ] **Notifications (`lib/notifications.ts`)**
+  - [ ] Request notification permission on first timer creation
+  - [ ] Service Worker registration via Serwist (`@serwist/next`)
+  - [ ] Schedule pre-warning notifications at cascade timestamps
+  - [ ] Different notification styles per urgency (title, body, icon, sound tag)
+  - [ ] Notification click → open app to timer detail
+  - [ ] Fallback: in-app toast if notifications denied
+
+- [ ] **Sound system (`lib/sounds.ts`)**
+  - [ ] Web Audio API setup with AudioContext
+  - [ ] 5 built-in alarm sounds (gentle chime, standard beep, urgent siren, critical alarm, soft bell)
+  - [ ] Volume mapping per urgency level
+  - [ ] Sound preview in settings
+  - [ ] Graceful fallback if audio blocked by browser
+
+- [ ] **Tab title countdown (`lib/tab-title.ts`)**
+  - [ ] Show "⏱ 14:32 — Standup" in browser tab title
+  - [ ] Update every second for active timer
+  - [ ] Flash title when timer fires (alternating "🔔 TIME!" and timer label)
+  - [ ] Restore original title when no active timers
+
+- [ ] **Alarm overlay (`components/AlarmOverlay.tsx`)**
+  - [ ] Full-screen overlay for CRITICAL urgency
+  - [ ] Pulsing animation, sound playing
+  - [ ] Large "Dismiss" button (with confirmation for Critical)
+  - [ ] "Snooze 5m / 10m / 15m / custom" buttons
+  - [ ] Cannot be accidentally dismissed (swipe-to-dismiss disabled for Critical)
+
+- [ ] **Pomodoro timer (`components/PomodoroView.tsx`)**
+  - [ ] Work/break cycle configuration (default: 25m work, 5m break, 4 rounds, 15m long break)
+  - [ ] Visual progress ring showing time remaining
+  - [ ] Round counter (e.g., "Round 2 of 4")
+  - [ ] Auto-transition between work and break
+  - [ ] Session complete celebration
+
+- [ ] **Dark + light theme**
+  - [ ] System preference detection (`prefers-color-scheme`)
+  - [ ] Manual toggle in header
+  - [ ] Theme persisted to localStorage
+  - [ ] All components themed via CSS custom properties + Tailwind dark mode
+
+- [ ] **PWA setup**
+  - [ ] Serwist service worker configuration
+  - [ ] Web app manifest (name, icons, theme color, display: standalone)
+  - [ ] Offline support: app shell cached, timers work offline
+  - [ ] Install prompt UI ("Add to home screen" banner)
+  - [ ] `manifest.ts` dynamic route for PWA manifest
+
+- [ ] **Keyboard shortcuts**
+  - [ ] `N` — new timer
+  - [ ] `Q` — quick timer modal
+  - [ ] `Space` — start/pause active timer
+  - [ ] `Esc` — dismiss alarm / close modal
+  - [ ] `?` — show shortcuts overlay
+
+- [ ] **Landing page (`app/page.tsx`)**
+  - [ ] Hero: animated clock + tagline "Never be caught off-guard again"
+  - [ ] 3 key features with icons (Pre-warnings, Visual Timeline, Smart Urgency)
+  - [ ] "Try it now" button → app dashboard (no signup needed)
+  - [ ] Social proof section (placeholder for future testimonials)
+  - [ ] Footer: links, GitHub, privacy
+
+### Phase 1 Exit Criteria
+
+- [ ] PWA installs and works offline on Chrome, Safari, Firefox
+- [ ] Timer fires with cascade pre-warnings at correct times
+- [ ] Notifications work on desktop Chrome, Android Chrome
+- [ ] iOS Safari: tab title countdown works (notification best-effort)
+- [ ] Pomodoro completes full 4-round session correctly
+- [ ] Lighthouse PWA score > 90
+- [ ] Page load < 2 seconds
+- [ ] All Vitest unit tests pass
+- [ ] Deployed to Vercel/Netlify with custom domain
+- [ ] 5 beta testers using it daily
+
+---
+
+## Phase 2: Intelligence — "Make It Smart" (Week 3-5)
+
+> **Goal:** Add the features that make ChronoMind irreplaceable — routines, NL input, focus mode, gamification.
+> **Success criteria:** Users create routines and say "This replaced 3 apps for me."
+
+### Week 3: Routines + Linked Timers
+
+- [ ] **Routine engine (`lib/routines.ts`)**
+  - [ ] Routine data model: ordered array of steps (label, duration, transition type)
+  - [ ] Transition types: immediate, 1m break, 5m break, custom
+  - [ ] Routine state machine: `ready → step_1_active → step_1_transition → step_2_active → ... → complete`
+  - [ ] Auto-advance between steps with transition notification
+  - [ ] Pause/resume entire routine (pauses current step timer)
+  - [ ] Skip step button
+  - [ ] Unit tests for multi-step routines with transitions
+
+- [ ] **Routine editor (`components/RoutineEditor.tsx`)**
+  - [ ] Add/remove/reorder steps (drag-and-drop)
+  - [ ] Per-step: label, duration, urgency, notes
+  - [ ] Routine templates: Morning (5 steps), Evening Wind-down (4 steps), Cooking Prep (3 steps)
+  - [ ] Save routine as template for reuse
+  - [ ] Total duration display (auto-calculated)
+  - [ ] Preview timeline of routine
+
+- [ ] **Routine runner (`components/RoutineRunner.tsx`)**
+  - [ ] Full-screen routine execution view
+  - [ ] Current step highlighted with countdown ring
+  - [ ] Next step preview
+  - [ ] Progress bar showing overall routine progress
+  - [ ] Step transition animation (gentle slide)
+  - [ ] "Done early" button to advance
+
+- [ ] **Linked timers (`lib/linked-timers.ts`)**
+  - [ ] "When timer A ends, start timer B" relationship
+  - [ ] Chain visualization in timeline
+  - [ ] Linked timer presets: Pasta (boil water → add pasta → start sauce)
+  - [ ] Cancel chain option (cancel one, option to cancel all linked)
+  - [ ] Unit tests for chain execution
+
+- [ ] **Natural language input (`components/NLInput.tsx` + `lib/nl-parser.ts`)**
+  - [ ] Integration with `chrono-node` for date/time parsing
+  - [ ] Examples: "Standup in 30 minutes", "Wake up at 6:30am tomorrow", "Remind me at 3pm to call Mom"
+  - [ ] Extract: time, duration, label, urgency hints ("important meeting" → Important)
+  - [ ] Sticky input bar at top of dashboard
+  - [ ] Parse preview: show parsed timer before confirming
+  - [ ] Fallback: if parse fails, open manual create form with whatever was understood
+  - [ ] Unit tests for 20+ natural language patterns
+
+### Week 4: Focus Mode + Stats
+
+- [ ] **Focus mode (`app/(app)/focus/`)**
+  - [ ] Activate focus: choose duration or "until next timer"
+  - [ ] Block all notifications except CRITICAL urgency
+  - [ ] Full-screen focus view with minimal distraction
+  - [ ] Ambient background sound options (rain, white noise, coffee shop) — Web Audio API
+  - [ ] Integration with Pomodoro (focus mode auto-activates during work intervals)
+  - [ ] Focus session summary on completion (time focused, distractions blocked)
+
+- [ ] **Contextual pre-warning messages (`lib/context-messages.ts`)**
+  - [ ] Based on timer label, generate helpful prep messages
+  - [ ] Rules engine: "meeting" → "Review your agenda", "flight" → "Check in online", "dentist" → "Leave in X minutes"
+  - [ ] Keyword → message mapping (expandable, no LLM needed)
+  - [ ] Custom messages per timer (user override)
+  - [ ] Show in notification body and on timeline
+
+- [ ] **Statistics + streaks (`app/(app)/history/`)**
+  - [ ] Timers created / completed / snoozed / dismissed — daily, weekly, monthly
+  - [ ] On-time rate: % of timers acted on within 2 minutes of firing
+  - [ ] Focus time: total hours in focus/Pomodoro mode
+  - [ ] Current streak: consecutive days with at least 1 completed timer
+  - [ ] Streak freeze: miss a day but keep streak (1 free freeze per week)
+  - [ ] Weekly summary card (shareable — great for social/viral)
+  - [ ] Charts: Recharts (line chart for trends, bar for daily breakdown)
+
+- [ ] **Categories / tags**
+  - [ ] Built-in categories: Work, Personal, Health, Cooking, Exercise, Study
+  - [ ] Custom tags
+  - [ ] Filter timeline by category
+  - [ ] Category-specific default urgency and cascade presets
+  - [ ] Color-coded category indicators on timeline
+
+- [ ] **Recurring timers (`lib/recurrence.ts`)**
+  - [ ] Recurrence rules: daily, weekday, weekend, weekly, biweekly, monthly, custom (select days)
+  - [ ] Next occurrence calculation
+  - [ ] "Skip next" and "Pause recurring" options
+  - [ ] Recurring timer badge on timeline
+  - [ ] Bulk edit: change all future occurrences
+  - [ ] Unit tests for recurrence edge cases (month boundaries, DST, etc.)
+
+### Week 5: Calendar + Neurodivergent Mode + Polish
+
+- [ ] **Calendar .ics import (`lib/calendar-import.ts`)**
+  - [ ] Parse `.ics` file (iCalendar format)
+  - [ ] Import events as alarms with auto-generated cascade
+  - [ ] Subscribe to calendar URL (re-fetch periodically)
+  - [ ] Import preview: show events before confirming
+  - [ ] Conflict detection: warn if imported event overlaps existing timer
+  - [ ] Map calendar event priority to urgency level
+
+- [ ] **Neurodivergent mode**
+  - [ ] Visual countdown ring (`components/CountdownRing.tsx`)
+    - [ ] Large, animated circular countdown (inspired by Time Timer)
+    - [ ] Color transitions: green → yellow → orange → red as time decreases
+    - [ ] Optional: fill vs drain animation style
+  - [ ] Gentle transition alerts (soft chime + visual pulse, not jarring alarm)
+  - [ ] Reduced cognitive load: hide advanced options by default, progressive disclosure
+  - [ ] Time blindness aids: "This is about as long as [familiar reference]" (e.g., "25 min — one TV episode")
+  - [ ] Body doubling placeholder: "Focus with others" room (v2 feature, show coming soon)
+  - [ ] Toggle in settings: "Gentle mode" (affects sounds, animations, notification style)
+
+- [ ] **Prep time intelligence**
+  - [ ] Per-timer: "I need X minutes to prepare"
+  - [ ] Auto-generates a prep warning: "Start preparing now — your meeting is in 20 minutes"
+  - [ ] Prep time shown on timeline as a colored block before the timer
+  - [ ] Smart defaults based on category (meeting → 10m, flight → 2h, cooking → 15m)
+
+- [ ] **Adaptive snooze learning (`lib/adaptive-snooze.ts`)**
+  - [ ] Track snooze patterns per timer/category
+  - [ ] After 5+ data points: "You always snooze your morning alarm 3 times. Set it 15 minutes later?"
+  - [ ] Suggestion shown as dismissable card on dashboard
+  - [ ] Accept → auto-adjusts recurring timer
+
+- [ ] **Timer history (`app/(app)/history/`)**
+  - [ ] Searchable log of all past timers
+  - [ ] Filter by category, urgency, date range
+  - [ ] "Repeat" button to recreate a past timer
+  - [ ] Export as CSV
+
+- [ ] **Playwright E2E tests**
+  - [ ] Create alarm → verify it appears on timeline
+  - [ ] Create countdown → verify it counts down → fires notification
+  - [ ] Create routine → run through all steps
+  - [ ] Pomodoro → complete 4 rounds
+  - [ ] NL input → verify parsing
+  - [ ] PWA install flow
+
+### Phase 2 Exit Criteria
+
+- [ ] Routines work end-to-end (create, run, complete, save as template)
+- [ ] NL input successfully parses 80%+ of natural time expressions
+- [ ] Focus mode blocks notifications during session
+- [ ] Streak tracking persists across sessions
+- [ ] Calendar .ics import works with Google Calendar exports
+- [ ] Neurodivergent mode noticeably gentler than default
+- [ ] All E2E tests pass in CI
+- [ ] 25+ beta testers, 3+ using routines daily
+- [ ] App Store / ProductHunt submission prepared
+
+---
+
+## Phase 3: Apple Native — "Own the Wrist" (Week 6-9)
+
+> **Goal:** Ship native iOS + Apple Watch + macOS apps that make ChronoMind the best timer experience on Apple devices.
+> **Success criteria:** Apple Watch complications are the #1 reason users love ChronoMind.
+> **Framework decision:** Fully native SwiftUI (NOT KMP) — see [platform analysis in PRD](PRD.md).
+
+### Week 6: iOS App Foundation
+
+- [ ] **Xcode project setup**
+  - [ ] Multi-target Xcode project: ChronoMind (iOS), ChronoMindWatch (watchOS), ChronoMindMac (macOS)
+  - [ ] Shared Swift package: `Shared/` folder included in all targets
+  - [ ] SwiftData for persistence (or Core Data if SwiftData has issues)
+  - [ ] Dependency: none beyond Apple frameworks (zero third-party for v1)
+  - [ ] Minimum deployment: iOS 17, watchOS 10, macOS 14
+
+- [ ] **Timer engine Swift port (`Shared/TimerEngine/`)**
+  - [ ] `Cascade.swift` — port from `cascade.ts`
+  - [ ] `Urgency.swift` — port from `urgency.ts`
+  - [ ] `Recurrence.swift` — port from `recurrence.ts`
+  - [ ] `Scheduler.swift` — port from `timer-engine.ts`
+  - [ ] `NLParser.swift` — port from `nl-parser.ts` (use NSDataDetector + custom patterns)
+  - [ ] `ContextMessages.swift` — port from `context-messages.ts`
+  - [ ] XCTest unit tests mirroring all Vitest tests from web
+  - [ ] **Estimated effort: 2-3 days** (~500-800 lines, logic is pure computation)
+
+- [ ] **Data models (`Shared/Models/`)**
+  - [ ] `CMTimer` — SwiftData model matching web Timer interface
+  - [ ] `CMRoutine` + `CMRoutineStep`
+  - [ ] `CMCategory`
+  - [ ] `CMTimerHistory`
+  - [ ] `CMUserPreferences`
+  - [ ] All models tagged with `@Model` for SwiftData
+
+- [ ] **iOS screens**
+  - [ ] `TimelineView` — vertical timeline (main screen, tab 1)
+  - [ ] `CreateTimerView` — alarm, countdown, pomodoro creation
+  - [ ] `QuickTimerSheet` — bottom sheet with one-tap presets
+  - [ ] `RoutineListView` + `RoutineRunnerView`
+  - [ ] `FocusView` — focus/Pomodoro session
+  - [ ] `HistoryView` — past timers, stats, streaks
+  - [ ] `SettingsView` — preferences, categories, sounds, neurodivergent mode
+  - [ ] Tab navigation: Timeline | Focus | History | Settings
+
+- [ ] **Notification scheduling (`Shared/Notifications/`)**
+  - [ ] `UNUserNotificationCenter` for all pre-warnings
+  - [ ] Schedule cascade notifications when timer is created
+  - [ ] Critical alerts: request `.criticalAlert` authorization for CRITICAL urgency
+  - [ ] Time Sensitive notifications for Important urgency
+  - [ ] Custom notification sounds per urgency
+  - [ ] Notification actions: Snooze 5m, Snooze 15m, Dismiss
+  - [ ] Reschedule all notifications when timer is modified
+
+- [ ] **Haptic engine**
+  - [ ] `UIImpactFeedbackGenerator` for pre-warning taps
+  - [ ] Escalating haptic pattern matching urgency (gentle → standard → heavy)
+  - [ ] Continuous haptic for Critical alarm (repeating pattern until dismissed)
+
+### Week 7: Apple Watch + Widgets
+
+- [ ] **Apple Watch app (`ChronoMindWatch/`)**
+  - [ ] `WatchTimelineView` — compact timeline for wrist
+  - [ ] `WatchTimerDetailView` — current timer with countdown ring
+  - [ ] `WatchQuickTimerView` — one-tap presets on Watch
+  - [ ] Digital Crown: scroll through upcoming timers
+  - [ ] Haptic pre-warnings on wrist (gentle tap for early warnings, prominent for final)
+  - [ ] Dismiss/snooze directly from Watch
+
+- [ ] **Watch complications**
+  - [ ] `WidgetKit` complications for Watch faces
+  - [ ] Circular: countdown to next timer
+  - [ ] Rectangular: next timer label + time remaining
+  - [ ] Inline: "Standup in 14m"
+  - [ ] Corner: countdown ring
+  - [ ] Update complications via `WidgetCenter.shared.reloadAllTimelines()`
+
+- [ ] **Live Activities + Dynamic Island**
+  - [ ] `ActivityKit` Live Activity for active countdown/Pomodoro
+  - [ ] Dynamic Island compact: timer name + countdown
+  - [ ] Dynamic Island expanded: countdown ring + snooze/dismiss buttons
+  - [ ] Lock Screen Live Activity: full countdown with cascade progress
+  - [ ] Auto-start Live Activity when timer enters final 30 minutes
+  - [ ] End Live Activity when timer is dismissed
+
+- [ ] **iOS widgets (`WidgetKit`)**
+  - [ ] Small widget: next timer countdown
+  - [ ] Medium widget: next 3 timers list
+  - [ ] Large widget: mini timeline
+  - [ ] Lock Screen widget: next timer inline
+  - [ ] Widget tap → deep link to timer in app
+  - [ ] Timeline provider: update every 5 minutes + on timer change
+
+- [ ] **Siri Shortcuts**
+  - [ ] "Set a timer for 25 minutes" → creates countdown
+  - [ ] "Start my morning routine" → starts saved routine
+  - [ ] "What's my next timer?" → speaks next timer info
+  - [ ] App Intents framework for iOS 17+
+  - [ ] Shortcuts app integration
+
+### Week 8: macOS + AI Reschedule
+
+- [ ] **macOS menu bar app (`ChronoMindMac/`)**
+  - [ ] Menu bar icon: shows countdown of next timer
+  - [ ] Click → popover with mini timeline
+  - [ ] Quick timer creation from popover
+  - [ ] Notification center integration (native macOS notifications)
+  - [ ] Keyboard shortcut: `Cmd+Shift+T` → quick timer
+  - [ ] Share 90%+ code with iOS via Shared/ folder
+
+- [ ] **AI reschedule**
+  - [ ] "I slept in 30 minutes" → shift all morning timers by 30m
+  - [ ] "Skip my next timer" → remove + adjust linked/dependent timers
+  - [ ] "Push everything back 1 hour" → bulk shift
+  - [ ] Smart suggestions: detect when user dismisses alarm late → "Shift your morning by X minutes?"
+  - [ ] Undo reschedule (keep old state for 1 hour)
+
+- [ ] **Gamification polish**
+  - [ ] Streak badges: 7-day, 30-day, 100-day
+  - [ ] Focus score: weekly score based on on-time rate + focus hours
+  - [ ] Weekly summary card (shareable image — key for viral growth)
+  - [ ] Gentle celebration animations (confetti for streak milestones, not obnoxious)
+
+### Week 9: Polish + TestFlight
+
+- [ ] **Cross-device continuity**
+  - [ ] Handoff: start timer on Mac, see it on iPhone and Watch
+  - [ ] iCloud sync for timer data (CloudKit)
+  - [ ] Shared UserDefaults via App Groups (iPhone ↔ Watch ↔ Widget)
+
+- [ ] **Accessibility**
+  - [ ] VoiceOver: all screens navigable, timer states announced
+  - [ ] Dynamic Type: all text scales
+  - [ ] Reduce Motion: disable animations when system setting is on
+  - [ ] High Contrast mode support
+
+- [ ] **XCTest + XCUITest**
+  - [ ] Unit tests for timer engine (mirroring web Vitest tests)
+  - [ ] Unit tests for cascade, recurrence, NL parser
+  - [ ] UI tests: create timer → verify timeline → fire → dismiss
+  - [ ] Widget snapshot tests
+
+- [ ] **TestFlight**
+  - [ ] Internal build: team testing
+  - [ ] External beta: 100 testers via TestFlight link
+  - [ ] Crash reporting: built-in MetricKit
+  - [ ] Feedback form in Settings
+
+### Phase 3 Exit Criteria
+
+- [ ] iOS app installs and all features work on iPhone 14+ (iOS 17)
+- [ ] Apple Watch complications update correctly on Watch Series 8+ (watchOS 10)
+- [ ] Live Activities show on Dynamic Island and Lock Screen
+- [ ] Widgets update on home screen and lock screen
+- [ ] macOS menu bar app works on macOS 14+
+- [ ] Siri Shortcuts work for top 3 use cases
+- [ ] AI reschedule correctly shifts timers
+- [ ] All XCTests and XCUITests pass
+- [ ] TestFlight beta: 100 external testers, crash-free rate > 99%
+- [ ] App Store submission prepared (screenshots, description, keywords)
+
+---
+
+## Phase 4: Context & Growth — "Make It Sticky" (Week 10-14)
+
+> **Goal:** Calendar sync, location awareness, sleep integration, and viral growth mechanics.
+> **Success criteria:** Users say "ChronoMind knows my schedule better than I do."
+
+### Week 10-11: Calendar + Location
+
+- [ ] **Full calendar sync**
+  - [ ] Google Calendar OAuth 2.0 integration
+  - [ ] Apple Calendar (EventKit) read access
+  - [ ] Outlook Calendar (Microsoft Graph API) integration
+  - [ ] Two-way sync: imported events become timers with auto-cascade
+  - [ ] Conflict resolution: calendar events take priority, manual timers preserved
+  - [ ] Sync frequency: every 15 minutes + on-demand refresh
+  - [ ] Visual distinction: synced events vs manual timers on timeline
+  - [ ] Web: OAuth flow in Next.js API routes
+  - [ ] iOS: EventKit for Apple Calendar, OAuth for Google/Outlook
+
+- [ ] **Location-based triggers**
+  - [ ] iOS: CoreLocation geofencing (enter/exit region)
+  - [ ] "Remind me when I leave home" → geofence exit trigger
+  - [ ] "Remind me when I arrive at office" → geofence enter trigger
+  - [ ] Saved locations: Home, Work, Gym (user-configured)
+  - [ ] Privacy-first: all location processing on-device, no server tracking
+  - [ ] Web: use Geolocation API (less reliable, best-effort)
+
+- [ ] **Travel time intelligence**
+  - [ ] Apple Maps API (MapKit) for travel time estimates
+  - [ ] "Your dentist appointment is in 45 minutes. Leave now — 28 min drive with current traffic."
+  - [ ] Auto-adjust pre-warning cascade based on real-time travel time
+  - [ ] Transport mode: driving, transit, walking (user preference per timer)
+  - [ ] Web: fallback to static estimate (user enters travel time manually)
+
+### Week 12: Sleep + Wellness
+
+- [ ] **Sleep integration**
+  - [ ] Bedtime routine: customizable wind-down sequence
+  - [ ] Smart alarm: set a wake window (e.g., 6:30-7:00) → alarm fires at optimal time
+  - [ ] Sleep tracking via HealthKit (Apple) — read sleep data, don't track directly
+  - [ ] "You slept 6h 20m. Shift your morning by 15 minutes?" (AI reschedule tie-in)
+  - [ ] Wind-down notifications: "Bedtime in 30 minutes — start winding down"
+  - [ ] Blue light reminder: "Consider turning on Night Shift"
+
+- [ ] **Mood/energy check-in**
+  - [ ] Quick check-in after completing a timer/routine: 😴 😐 😊 🔥 (4 energy levels)
+  - [ ] Correlate mood with time of day, timer type, sleep data
+  - [ ] Weekly insight: "You're most productive between 9-11 AM"
+  - [ ] Optional: prompt at consistent times (morning, post-lunch, evening)
+  - [ ] All data local — never sent to any server
+
+- [ ] **Cloud sync (optional, privacy-first)**
+  - [ ] E2E encrypted sync via CloudKit (Apple) or custom API
+  - [ ] Sync scope: timers, routines, categories, preferences, stats
+  - [ ] Conflict resolution: last-write-wins with vector clocks
+  - [ ] Opt-in: works perfectly offline, sync is a bonus
+  - [ ] Web: sync via authenticated API (JWT + encrypted payload)
+  - [ ] Delete account: wipes all cloud data immediately
+
+### Week 13-14: Viral Growth Mechanics
+
+- [ ] **Shareable weekly summary**
+  - [ ] Auto-generated card: "This week: 47 timers completed, 12h focused, 14-day streak 🔥"
+  - [ ] Beautiful design (dark bg, accent colors, ChronoMind branding)
+  - [ ] Share to: Instagram Stories, Twitter/X, LinkedIn, iMessage
+  - [ ] Deep link back to ChronoMind (UTM tracked)
+  - [ ] **This is the #1 viral mechanic — make it irresistible to share**
+
+- [ ] **Shareable timer**
+  - [ ] Create a timer and share link: "chronom.ind/t/abc123"
+  - [ ] Recipient opens link → timer auto-added to their ChronoMind
+  - [ ] Use case: "Here's the pasta recipe timing" / "Here's our meeting prep timer"
+  - [ ] Web link works without app (PWA fallback)
+  - [ ] iOS: Universal Link → opens app directly
+
+- [ ] **Referral program**
+  - [ ] "Invite a friend → both get 1 month Pro free"
+  - [ ] Unique referral code per user
+  - [ ] Track referral chain
+  - [ ] Show referral count in profile
+
+- [ ] **ProductHunt launch prep**
+  - [ ] Maker profile + product page
+  - [ ] Launch video (30s demo: create timer → cascade fires → Watch notification)
+  - [ ] 5 key screenshots (timeline, Watch, Dynamic Island, routine, focus)
+  - [ ] First comment prepared (story of why this exists)
+  - [ ] Schedule for Tuesday 12:01 AM PT (optimal PH launch time)
+
+- [ ] **App Store Optimization (ASO)**
+  - [ ] Keywords: "smart timer", "pre-warning alarm", "visual timeline", "focus timer", "routine timer", "ADHD timer", "pomodoro"
+  - [ ] 10 screenshots: iPhone (6.7" + 6.1"), iPad, Apple Watch, Mac
+  - [ ] App preview video (15-30s)
+  - [ ] Subtitle: "Smart Pre-Warning Timer & Routines"
+  - [ ] Category: Productivity (primary), Lifestyle (secondary)
+
+- [ ] **Content marketing**
+  - [ ] Blog post: "Why I Built ChronoMind — The Timer App That Understands Urgency"
+  - [ ] Twitter/X thread: "I analyzed every timer app. Here's what they all get wrong. 🧵"
+  - [ ] Reddit posts: r/productivity, r/ADHD, r/apple, r/webdev
+  - [ ] Hacker News: "Show HN: ChronoMind — AI-powered pre-warning timer (PWA + iOS)"
+  - [ ] YouTube: 3-minute walkthrough video
+
+- [ ] **SEO landing page**
+  - [ ] Target pages: "best timer app 2026", "ADHD timer app", "pre-warning alarm app"
+  - [ ] Comparison pages: "ChronoMind vs Tiimo", "ChronoMind vs Structured"
+  - [ ] Blog with timer/productivity tips (SEO content)
+
+### Phase 4 Exit Criteria
+
+- [ ] Calendar sync works with Google, Apple, Outlook calendars
+- [ ] Location triggers fire reliably (iOS geofencing)
+- [ ] Travel time estimates adjust pre-warning cascade
+- [ ] Sleep data integration working via HealthKit
+- [ ] Weekly summary card shareable to 3+ social platforms
+- [ ] Shareable timer links work (web + iOS universal link)
+- [ ] ProductHunt page live, launch scheduled
+- [ ] App Store listing approved and live
+- [ ] 500+ users (web + iOS combined)
+- [ ] 4.5+ star rating on App Store (from beta testers)
+
+---
+
+## Phase 5: Android + Scale — "Reach Everyone" (Week 15-22)
+
+> **Goal:** Ship Android + Wear OS, shared timers, and reach product-market fit.
+> **Success criteria:** 5,000 MAU, 4.5+ stars on both App Store and Play Store.
+
+### Week 15-17: Android App
+
+- [ ] **Android project setup**
+  - [ ] Jetpack Compose + Material 3 + Kotlin
+  - [ ] Room database (mirroring SwiftData schema)
+  - [ ] Hilt for dependency injection
+  - [ ] Minimum SDK: API 26 (Android 8.0)
+  - [ ] Gradle version catalog for dependency management
+
+- [ ] **Timer engine Kotlin port (`TimerEngine/`)**
+  - [ ] Port from Swift (which was ported from TypeScript) — all same logic
+  - [ ] `Cascade.kt`, `Urgency.kt`, `Recurrence.kt`, `Scheduler.kt`, `NLParser.kt`
+  - [ ] JUnit5 tests mirroring XCTest and Vitest tests
+  - [ ] **Estimated effort: 2-3 days** (same as Swift port)
+
+- [ ] **Android screens (Jetpack Compose)**
+  - [ ] `TimelineScreen` — vertical timeline
+  - [ ] `CreateTimerScreen` — alarm, countdown, Pomodoro
+  - [ ] `RoutineScreen` — list + runner
+  - [ ] `FocusScreen` — focus/Pomodoro session
+  - [ ] `HistoryScreen` — stats, streaks, history
+  - [ ] `SettingsScreen` — preferences, categories, neurodivergent mode
+  - [ ] Bottom navigation matching iOS tab structure
+
+- [ ] **Android notifications**
+  - [ ] `AlarmManager` for exact alarm scheduling (pre-warnings)
+  - [ ] Notification channels per urgency level
+  - [ ] Full-screen intent for CRITICAL urgency
+  - [ ] Notification actions: Snooze, Dismiss
+  - [ ] Foreground service for active countdown display
+  - [ ] `SCHEDULE_EXACT_ALARM` permission handling (Android 12+)
+
+- [ ] **Android widgets**
+  - [ ] Glance widgets (Jetpack Glance)
+  - [ ] Small: next timer countdown
+  - [ ] Medium: next 3 timers
+  - [ ] Large: mini timeline
+  - [ ] Widget tap → deep link to timer
+
+- [ ] **Android-specific features**
+  - [ ] Quick Settings tile: one-tap to create quick timer
+  - [ ] Persistent notification during active timer
+  - [ ] DND integration: timer-aware Do Not Disturb
+  - [ ] Google Calendar integration (CalendarContract)
+
+### Week 18-19: Wear OS + Polish
+
+- [ ] **Wear OS app**
+  - [ ] Compose for Wear OS
+  - [ ] `WearTimelineScreen` — scrollable timeline
+  - [ ] `WearTimerScreen` — countdown with rotary input
+  - [ ] Tile: next timer complication
+  - [ ] Haptic pre-warnings
+  - [ ] Dismiss/snooze from wrist
+
+- [ ] **Cross-platform cloud sync**
+  - [ ] Sync API: REST endpoints for timer CRUD + sync
+  - [ ] JWT authentication (reuse from web)
+  - [ ] E2E encryption: client-side encrypt before upload
+  - [ ] Sync protocol: last-write-wins with conflict detection
+  - [ ] Works across: Web ↔ iOS ↔ macOS ↔ Android
+  - [ ] Account creation: email + password or Apple/Google Sign-In
+
+### Week 20-21: Shared Timers + Social
+
+- [ ] **Shared timers (Family/Household)**
+  - [ ] Create a "household" group (invite via link)
+  - [ ] Shared timers visible to all household members
+  - [ ] Real-time sync: one person starts timer, everyone sees it
+  - [ ] Use cases: "Dinner in 30 minutes", "Leave for school in 15 min"
+  - [ ] Per-timer: shared vs private toggle
+  - [ ] Household admin: manage members, remove shared timers
+  - [ ] Up to 6 members per household (Family tier)
+
+- [ ] **Body doubling / shared focus (experimental)**
+  - [ ] "Focus room" — join a virtual co-working session
+  - [ ] See other participants' focus timers (anonymized)
+  - [ ] Accountability: "3 people are focusing with you"
+  - [ ] Optional: audio ambiance shared in room
+  - [ ] Join public rooms or create private (link invite)
+
+- [ ] **API + webhooks**
+  - [ ] REST API: CRUD timers, routines, categories
+  - [ ] API key authentication
+  - [ ] Webhook: `timer.fired`, `timer.dismissed`, `routine.completed`
+  - [ ] Use cases: Zapier integration, smart home triggers
+  - [ ] Rate limiting: 100 requests/minute per API key
+
+- [ ] **Smart Home integration**
+  - [ ] Webhook-based triggers to HomeKit/Alexa/Google Home
+  - [ ] "When wind-down routine starts → dim lights to 30%"
+  - [ ] "When morning alarm fires → turn on coffee machine"
+  - [ ] Shortcuts integration (iOS) for HomeKit scenes
+  - [ ] IFTTT applet for cross-platform home automation
+
+### Week 22: Launch + Scale
+
+- [ ] **Google Play launch**
+  - [ ] Play Store listing (screenshots, description, video)
+  - [ ] Play Store Optimization (similar keywords as App Store)
+  - [ ] Internal testing → Open testing → Production
+  - [ ] Crash reporting: Firebase Crashlytics
+
+- [ ] **Monetization activation**
+  - [ ] Free tier: all core features, local storage, Pomodoro, routines
+  - [ ] Pro tier ($3.99/mo or $29.99/yr): cloud sync, calendar integration, custom sounds, AI reschedule, advanced stats, location triggers
+  - [ ] Family tier ($5.99/mo): shared timers (up to 6 members), household coordination
+  - [ ] Stripe integration (web), StoreKit 2 (iOS), Google Play Billing (Android)
+  - [ ] Paywall: soft — show feature, explain it's Pro, easy upgrade
+  - [ ] 7-day free trial for Pro
+
+- [ ] **Voice control (v2 feature)**
+  - [ ] In-app voice: "Push everything back 30 minutes"
+  - [ ] Siri Shortcuts (already done in Phase 3)
+  - [ ] Google Assistant Actions
+  - [ ] Alexa Skill (stretch goal)
+
+- [ ] **Performance + scale**
+  - [ ] Web: Core Web Vitals all green
+  - [ ] iOS: 60fps animations, < 50MB app size
+  - [ ] Android: 60fps, < 40MB APK
+  - [ ] Watch: complications update within 15 minutes
+  - [ ] Sync API: < 200ms p99 latency
+  - [ ] 10,000 MAU target infrastructure
+
+### Phase 5 Exit Criteria
+
+- [ ] Android app live on Google Play, 4.5+ stars
+- [ ] Wear OS app functional on Pixel Watch / Galaxy Watch
+- [ ] Cross-platform sync working (web ↔ iOS ↔ Android)
+- [ ] Shared timers working for households (up to 6 members)
+- [ ] API + webhooks functional for automation
+- [ ] Monetization: Pro + Family tiers active, > 5% conversion rate
+- [ ] 5,000+ MAU across all platforms
+- [ ] < 0.1% crash rate on all platforms
+- [ ] Customer support: < 24h response time
+
+---
+
+## Success & Viral Playbook
+
+### Metrics That Matter
+
+| Metric | MVP Target | v1 Target | v2 Target |
+|--------|-----------|-----------|-----------|
+| **MAU** | 50 | 1,000 | 5,000 |
+| **DAU/MAU ratio** | > 40% | > 50% | > 50% |
+| **Pre-warning usage** | > 60% of timers | > 70% | > 75% |
+| **Routine creation** | > 20% of users | > 30% | > 35% |
+| **7-day retention** | > 30% | > 40% | > 50% |
+| **30-day retention** | > 15% | > 25% | > 30% |
+| **App Store rating** | — | 4.5+ | 4.5+ |
+| **Pro conversion** | — | > 3% | > 5% |
+| **Streak > 7 days** | — | > 15% of users | > 25% |
+| **Shared summary** | — | > 10% weekly | > 20% |
+
+### Viral Growth Loops
+
+```
+Loop 1: Weekly Summary Share
+User completes week → Beautiful summary card generated → Shares to social → 
+Friend sees → Clicks link → Downloads ChronoMind → Repeat
+
+Loop 2: Shared Timer
+User creates timer → Shares link with friend/family → Friend opens link →
+Timer auto-added → Friend discovers app → Downloads → Repeat
+
+Loop 3: Household Invite
+User activates Family plan → Invites household → Members join → 
+Members invite THEIR friends → Organic growth
+
+Loop 4: Content / SEO
+User writes about experience → Blog/Reddit/Twitter → Organic search →
+New user finds ChronoMind → Downloads → Repeat
+```
+
+### What Makes ChronoMind Go Viral
+
+1. **The "aha" moment** — First time a pre-warning fires and user thinks "I would have been late without this." Target: within first 24 hours of use.
+
+2. **Shareable summaries** — Weekly stats card must be *beautiful* enough that users *want* to share it. Design it like a Spotify Wrapped card. Include streak count, focus hours, on-time rate.
+
+3. **Apple Watch as walking billboard** — When someone glances at their Watch and sees a ChronoMind complication, their friend asks "What's that?" Word of mouth.
+
+4. **Routine templates** — "I use ChronoMind's Morning Routine template and it changed my life" → shareable templates that spread.
+
+5. **Neurodivergent community** — The ADHD community is vocal and supportive online. If ChronoMind genuinely helps with time blindness, they'll evangelize it. Target: r/ADHD, ADHD TikTok, ADHD Twitter.
+
+6. **ProductHunt launch** — Target top 5 on launch day. Prepare months in advance with a supporter base.
+
+7. **"Replace 3 apps" narrative** — Position ChronoMind as replacing Clock + Pomodoro + Routine app. Users love consolidation stories.
+
+### Pricing Strategy for Growth
+
+```
+Phase 1-2 (Web MVP):     100% free — no friction, maximum adoption
+Phase 3 (iOS launch):    100% free — build App Store momentum and reviews
+Phase 4 (Growth):        Introduce Pro — soft paywall on advanced features
+Phase 5 (Scale):         Pro + Family — monetize power users and households
+
+Free forever:            Timers, alarms, countdowns, Pomodoro, routines,
+                         visual timeline, pre-warnings, neurodivergent mode,
+                         stats, streaks, categories, keyboard shortcuts
+
+Pro ($3.99/mo):          Calendar sync, location triggers, cloud sync,
+                         custom sounds, AI reschedule, advanced analytics,
+                         travel time, export, priority support
+
+Family ($5.99/mo):       Everything in Pro + shared timers (6 members),
+                         household coordination, family routines
+```
+
+---
+
+## Risk Register
+
+| # | Risk | Severity | Phase | Mitigation |
+|---|------|----------|-------|------------|
+| 1 | PWA notifications unreliable on iOS | High | 1 | Tab title countdown + native iOS app in Phase 3 |
+| 2 | Feature creep delays MVP | High | 1-2 | Strict scope: alarm + countdown + Pomodoro only for Phase 1 |
+| 3 | Apple Watch complications don't update reliably | Medium | 3 | Budget for watchOS debugging; use TimelineProvider with aggressive updates |
+| 4 | Calendar OAuth complexity | Medium | 4 | Start with .ics import (Phase 2); full OAuth only in Phase 4 |
+| 5 | Competition adds pre-warnings | Medium | All | Ship fast; cascade + urgency + linked timers is hard to replicate |
+| 6 | Low App Store visibility | Medium | 3-4 | ASO from day 1; ProductHunt launch; content marketing |
+| 7 | Sync conflicts across platforms | Medium | 4-5 | Start with iCloud (Apple-only); cross-platform sync in Phase 5 |
+| 8 | Android notification restrictions (Doze, exact alarms) | Medium | 5 | Use `AlarmManager.setExactAndAllowWhileIdle()`; request permissions |
+| 9 | User overwhelm — too many features | Medium | 2+ | Progressive disclosure; smart defaults; "simple mode" toggle |
+| 10 | Monetization too early kills growth | Low | 4 | Free for 3 phases; only monetize when PMF is proven |
+
+---
+
+## Key Milestones & Dates
+
+| Milestone | Target Date | Phase | Celebration |
+|-----------|-------------|-------|-------------|
+| **MVP shipped** (web PWA live) | Week 2 | 1 | First 10 users 🎉 |
+| **Intelligence complete** (routines, NL, focus) | Week 5 | 2 | ProductHunt scheduled |
+| **iOS + Watch on TestFlight** | Week 9 | 3 | 100 beta testers |
+| **App Store launch** | Week 10 | 3→4 | ProductHunt same week |
+| **1,000 MAU** | Week 14 | 4 | Blog post celebrating |
+| **Android launch** | Week 18 | 5 | Play Store live |
+| **5,000 MAU** | Week 22 | 5 | Series of viral pushes |
+| **Monetization live** | Week 20 | 5 | Pro + Family tiers |
+
+---
+
+## Appendix: Tech Stack Summary
+
+| Platform | Framework | Key Libraries | Storage | Notifications |
+|----------|-----------|--------------|---------|---------------|
+| **Web** | Next.js 16, React 19 | TailwindCSS v4, shadcn/ui, Zustand, Serwist, chrono-node, date-fns, Recharts | IndexedDB (idb) | Web Push + Service Worker |
+| **iOS** | SwiftUI (iOS 17+) | SwiftData, WidgetKit, ActivityKit, EventKit, CoreLocation | SwiftData | UNUserNotificationCenter |
+| **watchOS** | SwiftUI (watchOS 10+) | WidgetKit (complications), ClockKit | App Groups shared | WKExtension notifications |
+| **macOS** | SwiftUI (macOS 14+) | AppKit (menu bar) | SwiftData (shared via iCloud) | NSUserNotificationCenter |
+| **Android** | Jetpack Compose | Material 3, Room, Hilt, Glance (widgets), AlarmManager | Room (SQLite) | NotificationManager + AlarmManager |
+| **Wear OS** | Compose for Wear OS | Tiles, Complications, Rotary Input | Room (shared) | Wearable notifications |
+| **Sync API** | TBD (Fastify or Cloudflare Workers) | JWT auth, E2E encryption | Cosmos DB or D1 | — |