Add ROADMAP.md with prioritized next steps from codebase analysis

ROADMAP.md

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+# Wrystr — Next Steps Roadmap
+
+_Generated 2026-03-09 based on codebase analysis._
+
+---
+
+## Quick wins (high impact, low effort)
+
+### 1. Settings View
+- Currently 100% stubbed with placeholder text
+- Add relay management: add/remove relay URLs
+- Appearance toggles (theme, etc.)
+- Key export/management UI
+
+### 2. Follow/Unfollow from UI (NIP-02 — P1)
+- Follow list is already fetched in the user store and used for the following feed
+- Just needs a Follow/Unfollow button on ProfileView
+- Data layer is already there — this is mostly UI work
+
+### 3. Reaction counts from network
+- Likes are currently tracked in localStorage only
+- Reaction counts from the network are never fetched or displayed
+- Would make notes feel much more alive socially
+
+---
+
+## Medium effort, high value
+
+### 4. Zaps (NIP-57 + NIP-47 — P2)
+- lud16 (Lightning address) is already shown on profile pages
+- Needs: zap modal, amount picker, NWC wallet connection (NIP-47)
+- Big UX differentiator vs other clients
+
+### 5. Search (NIP-50 — P1)
+- Not started at all
+- Easiest entry point: hashtag search (hashtags are already highlighted in NoteContent)
+- Then: full-text note search, user search
+
+### 6. OS Keychain via Rust (Tauri backend)
+- Security-critical: private keys currently only live in memory
+- Rust backend (`src-tauri/src/lib.rs`) only has a placeholder `greet()` command
+- Tauri has keychain plugins ready to use
+
+---
+
+## Longer term
+
+### 7. SQLite note caching
+- Notes disappear on every refresh — no persistence
+- Would make the app feel dramatically more solid and fast
+- Rust backend is the right place for this
+
+### 8. Direct Messages (NIP-44 — P3)
+- Significant complexity (encryption, key handling)
+- Major feature gap but non-trivial to implement well
+
+---
+
+## What's already done (for reference)
+
+- Global + following feed
+- Note rendering (images, video, mentions, hashtags)
+- Compose + reply
+- Reactions (like button, localStorage-persisted)
+- Profile view + edit
+- Thread view
+- Article editor (NIP-23, with draft auto-save)
+- Login (nsec + read-only pubkey)
+- Relay connection status view (read-only)
+- NDK wrapper for all Nostr interactions