v0.29.0

Desktop app (macOS) — read before first launch

The cuaderno-app-*.dmg is ad-hoc signed, not notarized, and there
is no auto-updater yet. To get it running:

1. Gatekeeper (right-click -> Open no longer works on macOS 15+):
   after copying the app to /Applications, run
   xattr -dr com.apple.quarantine /Applications/cuaderno.app
   (or use System Settings -> Privacy & Security -> "Open Anyway"
   after the first blocked attempt).
2. Vault discovery: on first launch the app asks for your vault
   folder with a native picker and remembers it. CUADERNO_VAULT_PATH
   overrides it for terminals/dev (CUADERNO_VAULT_PATH=... open -a cuaderno), but it is no longer required for a Finder launch.

What's Changed

• Skip the redundant reconcile on a successful config rebuild by @agustinvalencia in #421
• Surface a schema field's settable/log_on_change toggles in the Config form by @agustinvalencia in #422
• Edit template variables from the Config form by @agustinvalencia in #424
• Calendar: a Today button; render single newlines as line breaks by @agustinvalencia in #425
• Release v0.29.0 by @agustinvalencia in #426

Full Changelog: v0.28.0...v0.29.0