feat: add reload_vault_entry Tauri command

Re-reads a single .md file from disk and returns a fresh VaultEntry.
Used after failed optimistic updates to restore the true filesystem state.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/src/commands.rs

@@ -139,6 +139,12 @@ pub fn get_default_vault_path() -> Result<String, String> {
     vault::default_vault_path().map(|p| p.to_string_lossy().to_string())
 }
 
+#[tauri::command]
+pub fn reload_vault_entry(path: String) -> Result<VaultEntry, String> {
+    let path = expand_tilde(&path);
+    vault::reload_entry(std::path::Path::new(path.as_ref()))
+}
+
 #[tauri::command]
 pub fn save_image(vault_path: String, filename: String, data: String) -> Result<String, String> {
     let vault_path = expand_tilde(&vault_path);
@@ -671,6 +677,28 @@ mod tests {
         assert!(content.contains("Trashed at"));
     }
 
+    #[test]
+    fn test_reload_vault_entry_reads_from_disk() {
+        let dir = tempfile::TempDir::new().unwrap();
+        let note = dir.path().join("note.md");
+        std::fs::write(&note, "---\nStatus: Active\n---\n# Test\n").unwrap();
+
+        let entry = reload_vault_entry(note.to_str().unwrap().to_string()).unwrap();
+        assert_eq!(entry.title, "Test");
+        assert_eq!(entry.status, Some("Active".to_string()));
+
+        // Modify file on disk
+        std::fs::write(&note, "---\nStatus: Done\n---\n# Test\n").unwrap();
+        let fresh = reload_vault_entry(note.to_str().unwrap().to_string()).unwrap();
+        assert_eq!(fresh.status, Some("Done".to_string()));
+    }
+
+    #[test]
+    fn test_reload_vault_entry_nonexistent() {
+        let result = reload_vault_entry("/nonexistent/path.md".to_string());
+        assert!(result.is_err());
+    }
+
     #[test]
     fn test_check_vault_exists_false() {
         assert!(!check_vault_exists("/nonexistent/path/abc123".to_string()));

src-tauri/src/lib.rs

@@ -137,6 +137,7 @@ pub fn run() {
             commands::check_claude_cli,
             commands::stream_claude_chat,
             commands::stream_claude_agent,
+            commands::reload_vault_entry,
             commands::save_image,
             commands::copy_image_to_vault,
             commands::purge_trash,

src-tauri/src/vault/mod.rs

@@ -435,6 +435,15 @@ fn pod_to_json(pod: gray_matter::Pod) -> serde_json::Value {
     }
 }
 
+/// Re-read a single file from disk and return a fresh VaultEntry.
+/// Used after failed optimistic updates to restore the true filesystem state.
+pub fn reload_entry(path: &Path) -> Result<VaultEntry, String> {
+    if !path.exists() {
+        return Err(format!("File does not exist: {}", path.display()));
+    }
+    parse_md_file(path)
+}
+
 /// Read the content of a single note file.
 pub fn get_note_content(path: &Path) -> Result<String, String> {
     if !path.exists() {
@@ -543,6 +552,27 @@ mod tests {
         parse_md_file(&dir.path().join(name)).unwrap()
     }
 
+    #[test]
+    fn test_reload_entry_returns_fresh_data() {
+        let dir = TempDir::new().unwrap();
+        create_test_file(dir.path(), "note.md", "---\nStatus: Active\n---\n# My Note\n\nOriginal.");
+        let entry = reload_entry(&dir.path().join("note.md")).unwrap();
+        assert_eq!(entry.title, "My Note");
+        assert_eq!(entry.status, Some("Active".to_string()));
+
+        // Modify on disk and reload — must see the new content
+        create_test_file(dir.path(), "note.md", "---\nStatus: Done\n---\n# My Note\n\nUpdated.");
+        let fresh = reload_entry(&dir.path().join("note.md")).unwrap();
+        assert_eq!(fresh.status, Some("Done".to_string()));
+    }
+
+    #[test]
+    fn test_reload_entry_nonexistent_file() {
+        let result = reload_entry(std::path::Path::new("/nonexistent/path/note.md"));
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("does not exist"));
+    }
+
     const FULL_FM_CONTENT: &str = "---\nIs A: Project\naliases:\n  - Laputa\n  - Castle in the Sky\nBelongs to:\n  - Studio Ghibli\nRelated to:\n  - Miyazaki\nStatus: Active\nOwner: Luca\nCadence: Weekly\n---\n# Laputa Project\n\nThis is a project note.\n";
 
     #[test]