Playground compilation shows no progress feedback during ZK proof generation

### Packages versions

miden-base: latest
playground: web (playground.miden.xyz)

### Bug description

During tutorial compilation steps, the UI shows a generic spinning loader
with no progress indicator or estimated time. Compilation can take 1-3 minutes
which is confusing for new users who don't know if it's still working or frozen.

### How can this be reproduced?

1. Open playground.miden.xyz
2. Create a new script (Account Component or Note Script)
3. Click the Compile button
4. Observe the loading state — only a spinner shown, no progress or ETA

### Relevant log output

```shell

```