Display loading icons for upstream model ingestion

[ericokuma]

Resolves APP-259. Previously, the Project Status page displayed an error icon for resources waiting on upstream dependencies to finish processing (e.g., "resource is not idle"). This was confusing as it's a temporary waiting state, not an actual error.

This PR updates ResourceErrorMessage.svelte to:

• Detect specific messages indicating a resource is waiting for upstream dependencies.
• Display a loading spinner with a "Waiting for upstream dependencies to finish processing" tooltip in these cases, instead of an error icon.

This improves user clarity by differentiating between true errors and temporary processing states.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

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Linear Issue: APP-259

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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