Poll compute data to keep ui in sync
- every 3s when state is transitioning
- every 10s when idle
## To test
- open compute
- deploy compute instance via cli
- check ui updates automatically while state changes (new -> active ->
deleting -> removal)
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## Summary by CodeRabbit
* **New Features**
* Compute data now refreshes automatically, with faster updates while
instances are building or being deleted.
* Added clearer manual refresh feedback in the compute interface.
* **Improvements**
* Improved compute table layout with fixed column sizing and truncated
long instance names.
* Region and resource columns remain responsive while maintaining
consistent widths.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->