Audit improvements: fix Windows atomic rename collisions and clean up compiler warnings

src/transfer/archive.rs

@@ -11,6 +11,7 @@ use zip::{CompressionMethod, ZipArchive, ZipWriter};
 // ─────────────────────────────────────────────────────────────────
 
 /// Compress a whole folder into a ZIP archive with fast Deflate compression
+#[allow(dead_code)]
 pub fn compress_folder_to_zip(
     src_dir: &Path,
     zip_dest: &Path,

src/transfer/client.rs

@@ -96,12 +96,14 @@ impl TransferClient {
         }
     }
 
+    #[allow(dead_code)]
     pub async fn is_paused(&self, session_id: &str) -> bool {
         let flags = self.pause_flags.lock().await;
         flags.get(session_id).map(|f| f.load(Ordering::Relaxed)).unwrap_or(false)
     }
 
     /// Race-ping multiple candidate URLs and return the fastest responding one
+    #[allow(dead_code)]
     pub async fn pick_fastest_url(&self, candidates: &[String]) -> Option<String> {
         if candidates.is_empty() { return None; }
         if candidates.len() == 1 { return Some(candidates[0].clone()); }
@@ -1040,6 +1042,7 @@ impl TransferClient {
     }
 
     /// Fetch active watch-party state from host peer
+    #[allow(dead_code)]
     pub async fn get_watch_party(
         &self,
         peer_url: &str,
@@ -1062,6 +1065,7 @@ impl TransferClient {
     }
 
     /// Send watch-party sync event to host peer
+    #[allow(dead_code)]
     pub async fn send_watch_party_event(
         &self,
         peer_url: &str,

src/transfer/folder_sync.rs

@@ -10,6 +10,7 @@ use tracing::info;
 
 #[derive(Debug, Clone)]
 pub struct SyncStatusUpdate {
+    #[allow(dead_code)]
     pub pair_id: String,
     pub message: String,
     pub is_error: bool,
@@ -78,6 +79,7 @@ impl FolderSyncEngine {
         }
     }
 
+    #[allow(dead_code)]
     pub fn pairs_handle(&self) -> Arc<RwLock<Vec<FolderSyncPairConfig>>> {
         self.pairs.clone()
     }

src/transfer/server.rs

@@ -694,6 +694,9 @@ async fn handle_finish_transfer(
             let part_path = state.download_dir.join(format!("{}.zerosend_part", safe_rel_path.to_string_lossy()));
 
             if part_path.exists() {
+                if target_path.exists() {
+                    let _ = tokio::fs::remove_file(&target_path).await;
+                }
                 let _ = tokio::fs::rename(&part_path, &target_path).await;
                 if let Some(expected_hash) = &f.sha256 {
                     if let Ok(actual_hash) = super::client::compute_file_sha256(&target_path) {

src/transfer/webdav.rs

@@ -14,6 +14,7 @@ use tracing::{info, warn};
 
 pub struct WebDavState {
     pub shared_folders: Arc<RwLock<Vec<SharedFolderConfig>>>,
+    #[allow(dead_code)]
     pub port: u16,
 }
 
@@ -389,6 +390,7 @@ mod urlencoding {
 }
 
 /// Helper function to mount Windows Network Drive via `net use`
+#[allow(dead_code)]
 pub fn mount_webdav_drive(drive_letter: char, port: u16) -> Result<String, String> {
     let drive = format!("{}:", drive_letter);
     let url = format!("http://127.0.0.1:{}/webdav", port);
@@ -412,6 +414,7 @@ pub fn mount_webdav_drive(drive_letter: char, port: u16) -> Result<String, Strin
 }
 
 /// Helper function to unmount Windows Network Drive
+#[allow(dead_code)]
 pub fn unmount_webdav_drive(drive_letter: char) -> Result<(), String> {
     let drive = format!("{}:", drive_letter);
     let output = std::process::Command::new("net")

src/ui/gui.rs

@@ -49,6 +49,7 @@ pub struct AudioTrackInfo {
     pub name: String,
     pub url: String,
     pub peer_name: String,
+    #[allow(dead_code)]
     pub is_playing: bool,
 }
 
@@ -212,6 +213,7 @@ pub struct ZeroSendApp {
 
     // Media & Audio & Watch Party
     pub active_audio: Option<AudioTrackInfo>,
+    #[allow(dead_code)]
     pub audio_volume: f32,
     pub watch_party_session: Option<crate::transfer::WatchPartySyncEvent>,
     pub is_in_watch_party: bool,
@@ -232,8 +234,11 @@ pub struct ZeroSendApp {
     pub new_sync_folder_id: String,
 
     // WebDAV Windows Drive Mount State
+    #[allow(dead_code)]
     pub webdav_mounted: bool,
+    #[allow(dead_code)]
     pub webdav_drive_letter: char,
+    #[allow(dead_code)]
     pub webdav_status_msg: Option<String>,
 
     // Gitea Updater State
@@ -255,6 +260,7 @@ pub struct ZeroSendApp {
     share_text_rx: mpsc::UnboundedReceiver<(String, String, String, String, Option<String>, Option<String>, Option<String>, bool)>,
     share_text_tx: mpsc::UnboundedSender<(String, String, String, String, Option<String>, Option<String>, Option<String>, bool)>,
     sync_status_rx: mpsc::UnboundedReceiver<crate::transfer::SyncStatusUpdate>,
+    #[allow(dead_code)]
     sync_status_tx: mpsc::UnboundedSender<crate::transfer::SyncStatusUpdate>,
     update_rx: mpsc::UnboundedReceiver<Result<UpdateInfo, String>>,
     update_tx: mpsc::UnboundedSender<Result<UpdateInfo, String>>,

src/ui/vim_viewer.rs

@@ -57,6 +57,7 @@ impl Default for VimViewerModal {
 }
 
 impl VimViewerModal {
+    #[allow(dead_code)]
     pub fn open(
         &mut self,
         file_name: String,