Fix permissions on already-extracted sidecar dirs

The chmod fix only ran after fresh extraction, but existing sidecar
dirs extracted by older versions still lacked execute permissions.
Now set_executable_permissions() runs on EVERY app launch (both the
early-return path for existing dirs and after fresh extraction).

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

src-tauri/src/sidecar/mod.rs

@@ -98,6 +98,9 @@ impl SidecarManager {
 
         // Already extracted — use it directly
         if binary_path.exists() {
+            // Ensure all binaries are executable (fixes previously extracted dirs)
+            #[cfg(unix)]
+            Self::set_executable_permissions(&extract_dir);
             Self::cleanup_old_sidecars(data_dir, &current_version);
             return Ok(binary_path);
         }
@@ -113,23 +116,8 @@ impl SidecarManager {
             ));
         }
 
-        // Make all binaries executable on Unix (sidecar, ffmpeg, ffprobe, etc.)
         #[cfg(unix)]
-        {
-            use std::os::unix::fs::PermissionsExt;
-            if let Ok(entries) = std::fs::read_dir(&extract_dir) {
-                for entry in entries.flatten() {
-                    let path = entry.path();
-                    if path.is_file() {
-                        if let Ok(meta) = std::fs::metadata(&path) {
-                            let mut perms = meta.permissions();
-                            perms.set_mode(0o755);
-                            let _ = std::fs::set_permissions(&path, perms);
-                        }
-                    }
-                }
-            }
-        }
+        Self::set_executable_permissions(&extract_dir);
 
         Self::cleanup_old_sidecars(data_dir, &current_version);
         Ok(binary_path)
@@ -214,6 +202,24 @@ impl SidecarManager {
 
     /// Remove old sidecar-* directories that don't match the current version.
     /// Called after the current version's sidecar is confirmed ready.
+    /// Set execute permissions on all files in a directory (Unix only).
+    #[cfg(unix)]
+    fn set_executable_permissions(dir: &Path) {
+        use std::os::unix::fs::PermissionsExt;
+        if let Ok(entries) = std::fs::read_dir(dir) {
+            for entry in entries.flatten() {
+                let path = entry.path();
+                if path.is_file() {
+                    if let Ok(meta) = std::fs::metadata(&path) {
+                        let mut perms = meta.permissions();
+                        perms.set_mode(0o755);
+                        let _ = std::fs::set_permissions(&path, perms);
+                    }
+                }
+            }
+        }
+    }
+
     pub(crate) fn cleanup_old_sidecars(data_dir: &Path, current_version: &str) {
         let current_dir_name = format!("sidecar-{}", current_version);