feat: perf optimisation

project-intelligence/business-domain.md

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+<!-- Context: project-intelligence/business | Priority: high | Version: 1.0 | Updated: 2026-02-27 -->
+
+# Business Domain
+
+**Purpose**: Business context, problems solved, and value created for the comic/manga reader app.
+**Last Updated**: 2026-02-27
+
+## Quick Reference
+- **Update When**: Business direction changes, new features shipped
+- **Audience**: Developers needing context, stakeholders
+
+## Project Identity
+```
+Project Name: Stripstream
+Tagline: Modern web reader for digital comics and manga
+Problem: Need a responsive, feature-rich web interface for reading comics from Komga servers
+Solution: Next.js PWA that syncs with Komga API, supports offline reading, multiple reading modes
+```
+
+## Target Users
+| Segment | Who | Needs | Pain Points |
+|---------|-----|-------|--------------|
+| Comic/Manga Readers | Users with Komga servers | Read comics in browser | Komga web UI is limited |
+| Mobile Readers | iPad/Android users | Offline reading, touch gestures | No native mobile app |
+| Library Organizers | Users with large collections | Search, filter, track progress | Hard to manage |
+
+## Value Proposition
+**For Users**:
+- Read comics anywhere via responsive PWA
+- Offline reading with local storage
+- Multiple viewing modes (single/double page, RTL, scroll)
+- Progress sync with Komga server
+- Light/Dark mode, language support (EN/FR)
+
+**For Business**:
+- Open source showcase
+- Demonstrates Next.js + Komga integration patterns
+
+## Key Features
+- **Sync**: Read progress, series/books lists with Komga
+- **Reader**: RTL, double/single page, zoom, thumbnails, fullscreen
+- **Offline**: PWA with local book downloads
+- **UI**: Dark/light, responsive, loading/error states
+- **Lists**: Pagination, search, mark read/unread, favorites
+- **Settings**: Cache TTL, Komga config, display preferences
+
+## Tech Stack Context
+- Integrates with **Komga** (comic server API)
+- Uses **MongoDB** for local caching/preferences
+- **NextAuth** for authentication (session-based)
+
+## Success Metrics
+| Metric | Target |
+|--------|--------|
+| Page load | <2s |
+| Reader responsiveness | 60fps |
+| PWA install rate | Track via analytics |
+
+## Constraints
+- Requires Komga server (not standalone)
+- Mobile storage limits for offline books
+
+## Related Files
+- `technical-domain.md` - Tech stack and code patterns
+- `business-tech-bridge.md` - Business-technical mapping