Bump to v0.2.1 — Batch 3 playtest fixes + auto-updater fix

- Fix: repost + quote buttons added to RootNote in ThreadView (Issue A)
- Fix: switchAccount no longer silently goes read-only when nsec keychain
  entry is missing — nsec accounts stay logged out so the login button
  handles recovery; loginType field added to SavedAccount (Issue B)
- Fix: macos-12 runner replaced with macos-13 in release.yml — macos-12
  was deprecated by GitHub, causing macOS jobs to never run, which
  prevented latest.json from being assembled and broke the auto-updater
  for every user since v0.1.5
- Bump Cargo.toml version (was stuck at 0.1.10)
- Release notes updated with v0.2.1 + v0.2.0 Phase 2 changelog
- README: Windows unsigned installer note added
- ROADMAP: NIP-05 monetization added to brainstorm backlog

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Wrystr",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "identifier": "com.hoornet.wrystr",
   "build": {
     "beforeDevCommand": "npm run dev",