chore(release): bump version to 1.3.4

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VAyr8d7HuAdUGB6aA5xmDD

CHANGELOG.md

@@ -4,6 +4,11 @@
 
 Format based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); versions follow SemVer.
 
+## [1.3.4] - 2026-10-31
+
+### Fixed
+- **Desktop app: only one window on startup.** The main window used to be visible from launch, so the unprivileged instance's normal window would show, flash while the system asked for the administrator password, and only then get replaced by the elevated relaunch's window a moment later. The window now stays hidden until elevation is resolved — either already elevated, elevation failed (the window then shows the warning), or this is the already-elevated relaunched instance — so only one window ever appears, matching Sabiá.
+
 ## [1.3.3] - 2026-10-30
 
 Unified updater architecture with Sabiá: migrated from the signed `tauri-plugin-updater` to direct Gitea Releases API checking and self-updating with SHA-256 verification.