feat(history): add Tauri commands for transcript persistence and FTS5 search

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src-tauri/src/commands/mod.rs

@@ -1,6 +1,7 @@
 pub mod audio;
 pub mod clipboard;
 pub mod hardware;
+pub mod history;
 pub mod models;
 pub mod transcription;
 pub mod windows;