release: ship v1.8.0 with knowledge, recording and settings sync

Knowledge documents move between desktop, phone and web as source text and
are indexed on each device; desktop recordings upload to the shared storage
and any recording plays from the history card; language, theme, auto-polish
and the active command follow the phone. Document text survives a missing
embedding model so it can be indexed later.

Bumps the product version to 1.8.0 (Android/iOS build 1080000).

CHANGELOG.md

@@ -12,6 +12,25 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Additional Whisper model management UI
 - Plugin system for custom pipelines
 
+## [1.8.0] - 2026-09-27
+
+> Published from an annotated tag. Installer and update metadata are served by the
+> canonical Forgejo feed; no binaries are committed to this repository.
+
+### Added
+- **Knowledge base syncs with your phone.** Documents added on the desktop can be
+  searched on the phone and web, and documents added there appear on the desktop and
+  are indexed with the local model. Deleting one removes it everywhere.
+- **Recordings sync and play anywhere.** Desktop recordings are uploaded (up to 50 MB
+  each, can be turned off in Settings > Cloud) so the phone can play them, and each
+  history card has a play button that also plays recordings made on the phone.
+- **Shared settings.** Language (Korean/English), light/dark/system theme,
+  auto-polish on or off and the active command follow the phone.
+
+### Fixed
+- A document's text is kept even when the local embedding model is unavailable, so
+  it can be indexed later without the original file.
+
 ## [1.7.0] - 2026-09-27
 
 > Published from an annotated tag. Installer and update metadata are served by the