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+# Remanso React Native Migration — Design Spec
+
+**Date:** 2026-04-20
+**Status:** Approved
+
+## Overview
+
+Migrate Remanso from a Vue 3 web app to a fully native iOS + Android app built with Expo (React Native). The primary motivation is native feel: fluid stack animations, swipe-back gestures, and native navigation chrome. The scope is a full replacement of the web app.
+
+## Tech Stack
+
+| Concern | Current (Vue) | React Native |
+|---|---|---|
+| Framework | Vue 3 + Vite | Expo SDK (managed workflow) |
+| Routing | Vue Router | Expo Router (file-system routing over React Navigation v7) |
+| State | Pinia | Zustand |
+| Server state | TanStack Vue Query | TanStack Query (same library) |
+| Styling | DaisyUI + Tailwind CSS | NativeWind v4 |
+| Local DB | PouchDB (IndexedDB) | Expo SQLite |
+| Simple KV store | localStorage | MMKV |
+| Auth | OAuth redirects | expo-auth-session |
+| GitHub API | @octokit/rest | @octokit/rest (unchanged) |
+| i18n | vue-i18n | react-i18next |
+| Date utils | date-fns | date-fns (unchanged) |
+| Markdown content | markdown-it (DOM) | react-native-webview |
+| Fonts | CSS custom properties | expo-font |
+
+## Navigation Structure
+
+Expo Router generates a React Navigation v7 tree from the file system. The stacked note pattern — the core native feel win — maps to a nested Stack navigator where each backlink push adds a note with a native slide animation and swipe-left pops it.
+
+```
+Root Stack
+├── Auth screens (unauthenticated, no tab bar)
+│   ├── Home / Welcome
+│   ├── GitHub OAuth callback
+│   └── ATProto OAuth callback
+│
+└── Authenticated App — Bottom Tabs
+    ├── Tab: Feed (Stack)
+    │   ├── Repo picker
+    │   └── Note Stack (nested Stack)
+    │       ├── Note (root)
+    │       ├── Note (pushed via backlink)  ← swipe-back to pop
+    │       └── Note (pushed via backlink)  ← swipe-back to pop
+    │
+    ├── Tab: Inbox / Drafts / Todos (Stack)
+    │   └── Note list → Note detail
+    │
+    ├── Tab: Public Notes (Stack)
+    │   ├── Public note list
+    │   └── Public note detail
+    │
+    └── Tab: Settings (Stack)
+        ├── Settings root
+        └── Font picker (presented as modal)
+```
+
+History and Spaced Repetition are accessible as sections within the Feed tab or as additional tabs — to be decided during implementation.
+
+## Data Layer
+
+PouchDB is replaced by **Expo SQLite** for structured data and **MMKV** for simple key-value preferences.
+
+### Expo SQLite schema
+
+```sql
+CREATE TABLE IF NOT EXISTS github_tokens (
+  id TEXT PRIMARY KEY,
+  access_token TEXT NOT NULL,
+  refresh_token TEXT,
+  expires_at INTEGER
+);
+
+CREATE TABLE IF NOT EXISTS atproto_sessions (
+  id TEXT PRIMARY KEY,
+  did TEXT NOT NULL,
+  session_json TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS saved_repos (
+  id TEXT PRIMARY KEY,
+  user TEXT NOT NULL,
+  repo TEXT NOT NULL,
+  files_json TEXT NOT NULL,
+  cached_at INTEGER NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS history (
+  id TEXT PRIMARY KEY,
+  user TEXT NOT NULL,
+  repo TEXT NOT NULL,
+  note_path TEXT NOT NULL,
+  content TEXT NOT NULL,
+  created_at INTEGER NOT NULL
+);
+```
+
+The existing `DataApi` interface (`add`, `update`, `remove`, `get`, `getAll`) is re-implemented as a thin wrapper over Expo SQLite. No ORM — plain async SQL with `CREATE TABLE IF NOT EXISTS` on first open handles schema initialization at this scale.
+
+Sensitive data (access tokens, refresh tokens, ATProto sessions) is stored in **Expo SecureStore** rather than plain SQLite. SQLite holds only metadata and content cache.
+
+### MMKV
+
+Replaces localStorage for user settings: font family, font size, theme preference. Synchronous reads, no async overhead.
+
+### No Web Worker
+
+Database calls move to the main thread via Expo SQLite's async API. The performance concern that justified the Web Worker on web does not apply on mobile.
+
+## Auth Flows
+
+### GitHub OAuth
+
+The existing auth server (`api.remanso.space/auth/github`) handles code exchange — the client flow is unchanged:
+
+1. `expo-auth-session` opens an in-app browser tab with the GitHub authorize URL
+2. OAuth redirect captured by Expo's deep link handler
+3. Code sent to `api.remanso.space/auth/github?code=...` for token exchange
+4. Access token + refresh token stored in Expo SecureStore
+5. Token refresh logic (15-minute pre-expiry check) stays the same; HTTP calls use `fetch`
+
+### ATProto / Bluesky OAuth
+
+`@atproto/oauth-client-browser` is browser-only (IndexedDB, `window.crypto`, browser redirects). There is no official React Native client. A custom client (~200–300 lines) is implemented using:
+
+- `expo-auth-session` for the OAuth redirect flow (PKCE)
+- `expo-crypto` for PKCE code verifier/challenge generation
+- Expo SecureStore for session persistence
+- The same Bluesky API endpoints as the browser client
+
+This keeps ATProto auth fully client-side, consistent with the app's current architecture.
+
+## State Management
+
+Zustand replaces Pinia. The store shape is identical to `userRepo.store.ts`:
+
+```ts
+const useRepoStore = create<RepoState>((set, get) => ({
+  user: '',
+  repo: '',
+  files: [],
+  userSettings: null,
+  needToLogin: false,
+  setRepo: (user, repo) => set({ user, repo }),
+  loadFiles: async () => { /* Octokit call */ },
+  loadSettings: async () => { /* MMKV read */ },
+}))
+```
+
+TanStack Query handles all GitHub API server state (file fetching, README, repo listing) — same library, same patterns as today.
+
+## Styling
+
+NativeWind v4 provides Tailwind utility classes in React Native. DaisyUI is web-only and has no React Native equivalent — all component styling (buttons, cards, modals) is hand-written using NativeWind utilities.
+
+The two DaisyUI themes (`retro` light, `coffee` dark) are translated into a custom NativeWind theme in `tailwind.config.ts` with the same color tokens. System appearance (`useColorScheme`) drives theme selection.
+
+Font customization uses `expo-font` for loading custom fonts and React Native's `fontFamily` style prop, replacing the CSS custom property approach.
+
+## Markdown Rendering
+
+The markdown-it pipeline (KaTeX, Mermaid, shiki, tabler icons, html5-media, GitHub alerts, checkboxes) runs in the React Native JS context unchanged — same code, same output. The resulting HTML string is passed to a `NoteWebView` component built on `react-native-webview`.
+
+`NoteWebView` is a native UIView/View wrapper around a WebView engine. It is a React Native component — not a web app. The surrounding app (navigation chrome, tab bar, headers, settings, auth screens) is 100% native. Only the note content pane renders HTML. This is the standard pattern for rich content in React Native (used by GitHub Mobile, Linear, and others).
+
+The WebView communicates back to the native layer via `postMessage` for:
+- Internal note link taps (trigger React Navigation push)
+- External URL taps (open in system browser)
+- Backlink detection events
+
+## Project Structure
+
+```
+src/
+├── app/                        # Expo Router — file-system screens
+│   ├── _layout.tsx             # Root Stack navigator
+│   ├── index.tsx               # Home / Welcome
+│   └── (tabs)/                 # Authenticated tab navigator
+│       ├── _layout.tsx
+│       ├── feed/               # Feed + Note Stack screens
+│       ├── inbox/
+│       ├── public/
+│       └── settings/
+│
+├── modules/                    # Feature domains (mirrors current structure)
+│   ├── note/                   # Note models, hooks, caching
+│   ├── repo/                   # Zustand store, Octokit service
+│   ├── user/
+│   │   ├── auth/               # GitHub + ATProto OAuth hooks
+│   │   └── fonts.ts            # Font downloading (was utils/downloadFont.ts)
+│   ├── card/                   # Spaced repetition
+│   ├── history/                # Edit history
+│   ├── atproto/                # Custom ATProto OAuth client, DID resolution
+│   └── post/                   # ts-rest API client (unchanged)
+│
+├── components/                 # Shared UI components
+│
+├── rendering/                  # Markdown pipeline — first-class module
+│   ├── pipeline.ts             # markdown-it setup + plugin registration
+│   ├── plugins/                # Custom plugins
+│   │   ├── html5-media.ts
+│   │   ├── regexp.ts
+│   │   └── tabler-icons.ts
+│   └── NoteWebView.tsx         # react-native-webview wrapper
+│
+├── lib/                        # Shared low-level, stateless helpers
+│   ├── text.ts                 # slugify, noteTitle, displayLanguage
+│   ├── links.ts                # link.ts + youtube.ts
+│   ├── encoding.ts             # decodeBase64ToUTF8
+│   └── notifications.ts        # notif.ts
+│
+├── hooks/                      # React hooks
+├── data/                       # Expo SQLite wrapper (same DataApi interface)
+├── locales/                    # i18n strings (unchanged)
+└── constants/                  # Theme tokens, note width constants
+```
+
+## Key Risks
+
+1. **ATProto custom OAuth client** — no official SDK; requires careful PKCE implementation and session lifecycle management.
+2. **DaisyUI → NativeWind component styling** — no 1:1 mapping; all themed components need to be rebuilt. Most labor-intensive non-feature work.
+3. **NoteWebView ↔ native bridge** — link tap handling and scroll coordination between the WebView and the native Stack navigator require careful implementation to feel seamless.
+4. **Mermaid in WebView** — Mermaid is JS-heavy; initial render may be slow on lower-end Android. May need lazy rendering or a timeout fallback.
+
+## Out of Scope
+
+- PWA / service worker (not applicable to native)
+- Web Worker (replaced by async SQLite)
+- Comlink (not applicable)
+- Server-side rendering