release: ship v1.9.0 with transcript segments and preset prompts on the phone

Desktop transcript edits, auto-polish and speaker labels now reach the phone,
which draws meetings from transcript segments, and prompt edits of the four
shared preset commands are used by the phone's commands.

Bumps the product version to 1.9.0 (Android/iOS build 1090000).

CHANGELOG.md

@@ -12,6 +12,22 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Additional Whisper model management UI
 - Plugin system for custom pipelines
 
+## [1.9.0] - 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
+- **Preset commands you edit on the desktop are used on the phone.** Changing the
+  prompt of Translate, Summarize, Professional rewrite or Explain code updates the same
+  command on your phone; restoring the default restores it there too.
+
+### Fixed
+- **Meeting transcripts edited on the desktop now show on the phone.** Edits,
+  auto-polish and speaker labels were kept on the desktop only because the phone
+  shows a meeting from its transcript segments; those are now updated with every
+  change.
+
 ## [1.8.0] - 2026-09-27
 
 > Published from an annotated tag. Installer and update metadata are served by the