feat: add Tauri state persistence and BvCli trait

- Add Tauri storage adapter for Zustand (tauri-storage.ts)
- Add read_state, write_state, clear_state Tauri commands
- Wire focus-store and nav-store to use Tauri persistence
- Add BvCli trait for bv CLI mocking with response types
- Add BvError and McError conversion for bv errors
- Add cleanup_tmp_files tests for bridge
- Fix linter-introduced tauri_specta::command issues

Closes bd-2x6, bd-gil, bd-3px

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src-tauri/src/data/bridge.rs

@@ -7,6 +7,7 @@
 //! - Single-instance locking via flock(2)
 
 use serde::{Deserialize, Serialize};
+use specta::Type;
 use std::collections::HashMap;
 use std::fs::{self, File};
 use std::io::{self, Write};
@@ -109,7 +110,7 @@ impl MappingKey {
 }
 
 /// Result of a sync operation
-#[derive(Debug, Default, Serialize)]
+#[derive(Debug, Default, Serialize, Type)]
 pub struct SyncResult {
     /// Number of new beads created
     pub created: usize,
@@ -1323,4 +1324,48 @@ mod tests {
         assert_eq!(r4.closed, 1);
         assert!(!map.mappings.contains_key("issue:g/p:42"));
     }
+
+    // -- cleanup_tmp_files tests --
+
+    #[test]
+    fn test_cleanup_tmp_files_removes_orphaned_tmp() {
+        let dir = TempDir::new().unwrap();
+        let bridge = test_bridge(MockLoreCli::new(), MockBeadsCli::new(), &dir);
+
+        // Create an orphaned .tmp file (simulating a crash during save_map)
+        let tmp_file = dir.path().join("gitlab_bead_map.json.tmp");
+        std::fs::write(&tmp_file, "orphaned data").unwrap();
+        assert!(tmp_file.exists());
+
+        // Cleanup should remove it
+        let cleaned = bridge.cleanup_tmp_files().unwrap();
+        assert_eq!(cleaned, 1);
+        assert!(!tmp_file.exists());
+    }
+
+    #[test]
+    fn test_cleanup_tmp_files_ignores_non_tmp_files() {
+        let dir = TempDir::new().unwrap();
+        let bridge = test_bridge(MockLoreCli::new(), MockBeadsCli::new(), &dir);
+
+        // Create a regular file (should not be removed)
+        let json_file = dir.path().join("gitlab_bead_map.json");
+        std::fs::write(&json_file, "{}").unwrap();
+
+        let cleaned = bridge.cleanup_tmp_files().unwrap();
+        assert_eq!(cleaned, 0);
+        assert!(json_file.exists());
+    }
+
+    #[test]
+    fn test_cleanup_tmp_files_handles_missing_dir() {
+        let dir = TempDir::new().unwrap();
+        let nonexistent = dir.path().join("nonexistent");
+        let bridge: Bridge<MockLoreCli, MockBeadsCli> =
+            Bridge::with_data_dir(MockLoreCli::new(), MockBeadsCli::new(), nonexistent);
+
+        // Should return 0, not error, when dir doesn't exist
+        let cleaned = bridge.cleanup_tmp_files().unwrap();
+        assert_eq!(cleaned, 0);
+    }
 }