Progress ticker thread keeps running if a scan panics

[Muawiya-contact]

start_scan spawns a thread that emits scan-progress every 150ms and stops it after the scan finishes:

let result = tauri::async_runtime::spawn_blocking(move || { ... })
    .await
    .map_err(|e| e.to_string())?;   // <- returns here on a panic

stop.store(true, Ordering::Relaxed);
let _ = ticker.join();

The ? is before the stop.store. If the blocking task panics (a rayon or jwalk worker dying on an odd filesystem, say), start_scan returns the join error and the ticker thread is left running for the rest of the process — still emitting progress events every 150ms behind the error state in the UI.

Setting stop before the ?, or wrapping the ticker in a guard that stops on drop, would cover it.

app/src-tauri/src/commands.rs:55