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>

README.md

@@ -18,6 +18,8 @@ Grab the latest release from the [Releases page](https://github.com/hoornet/wrys
 | macOS (Apple Silicon) | `aarch64.dmg` | open and drag to Applications |
 | macOS (Intel) | `x86_64.dmg` | open and drag to Applications |
 
+**Windows note:** The installer is not yet code-signed. Windows SmartScreen will show an "Unknown publisher" warning — click "More info → Run anyway" to install.
+
 ## Features
 
 **Identity & accounts**