Skip late tick sounds after the round-change alert

[tiendo1011]

What I observe

With tick sounds on, when a work round ends and the break starts, the first few ticks of the break play rushed together. After that, the ticks go back to one per second.

What I think causes it

I don't have experience with Rust or Tauri, so please correct me if I've misread this.

The audio thread in src-tauri/src/audio/mod.rs plays one sound at a time and waits for each one to finish (sleep_until_end). The round-change alert is about 3 seconds long. The ticks requested during those 3 seconds wait in the channel, then play back-to-back once the alert ends.

The change

Each play request now records when it was made. The audio thread skips a tick if it is more than 500 ms late. Alerts are never skipped.

As a side effect, no ticks play while the alert is playing. After the alert, ticks resume on schedule.

A fuller fix would mix sounds so ticks play over the alert. I kept this one small on purpose.

Testing

• cargo test passes.
• I ran the app and checked a work → break transition: ticks no longer bunch up after the alert.