[kitlangton]

On macOS and Windows, switching to a speech model that's already downloaded now says "Verifying model" and then "Loading model" instead of "Downloading 0%".
Linux already showed the real stage. Downloads look the same as before.

❌ Before

1. You pick a model you already have, in the picker or the menu bar.
2. Hex checks the file and loads it; nothing is downloaded.
3. ❌ The picker and General's model row said "Downloading" the whole time, because the stage the model worker knew was thrown away and the window was always told "Downloading".

✅ After

1. Same pick.
2. The worker records its own stage (verifying, downloading, loading) and the window is told that.
3. ✅ The picker says "Verifying model", then "Loading model · Ns"; a real download still shows its percentage.

- worker: verify or download -> load        (stage kept in a throwaway counter)
- window: stage = preparing ? Downloading : none
+ worker: Verifying | Downloading -> Loading (stage kept with the task)
+ window: stage = the task's stage

📊 Proof: the picker with a model being prepared, before (what macOS and Windows always showed) and after (an installed model being checked).

	Light	Dark
Before
After

These stills use the picker's fixture scene with its stage set by hand; the goldens don't change because the scenes set the stage themselves. New test status_reports_the_worker_s_own_stage checks an installed-only pick starts at Verifying, follows the worker to Loading, and a waiting download starts at Downloading.

👀 Read: status() in preparation.rs: a waiting request has no task yet, so it reports the stage its worker will start in. The rest is routine.

_{Found in a code audit (findings 08.5 and 06.3, the same defect) · no user reports}

Checks run

• scripts/check preparation macos_rune (macOS): 30 passed
• cargo clippy --locked --all-targets --features onnx-benchmark -- -D warnings (macOS): clean
• check-windows.yml on this branch: passed, https://github.com/anomalyco/hex/actions/runs/43313107101