Set execute permissions on ALL files in sidecar dir on Unix

Previously only the main sidecar binary got chmod 755. Now all files
in the extraction directory get execute permissions — covers ffmpeg,
ffprobe, and any other bundled binaries. Applied in three places:
- sidecar/mod.rs: after local extraction
- commands/sidecar.rs: after download extraction
- commands/media.rs: removed single-file fix (now handled globally)

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

src-tauri/src/commands/sidecar.rs

@@ -197,15 +197,21 @@ pub async fn download_sidecar(app: AppHandle, variant: String) -> Result<(), Str
     let extract_dir = data_dir.join(format!("sidecar-{}", sidecar_version));
     SidecarManager::extract_zip(&zip_path, &extract_dir)?;
 
-    // Make the binary executable on Unix
+    // Make all binaries executable on Unix (sidecar, ffmpeg, ffprobe, etc.)
     #[cfg(unix)]
     {
         use std::os::unix::fs::PermissionsExt;
-        let binary_path = extract_dir.join("voice-to-notes-sidecar");
-        if let Ok(meta) = std::fs::metadata(&binary_path) {
-            let mut perms = meta.permissions();
-            perms.set_mode(0o755);
-            let _ = std::fs::set_permissions(&binary_path, perms);
+        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);
+                    }
+                }
+            }
         }
     }