supabase / supabase / 28502183435

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feat(studio): clean up service health chart labels (DEBUG-148) (#47217)

## What

Cleans up the service health chart labels so they are consistent across
the project homepage usage charts (behind the `newHomepageUsageDeltas`
flag) and the `/observability` service health table. Part of DEBUG-148.

## Changes

- Per-level charts now read `Errors / Warnings / Infos` (the success
series was `Ok` on `/observability` and `Requests` on the homepage).
- Homepage service cards use full-word `Warnings` / `Errors` headers
(was `Warn` / `Err`).
- The `Total Requests` headline keeps the `Requests` wording and its
existing value.

## Not in this PR

- Grouping the API Gateway chart by product. Summing every service's log
levels and labeling it "API Gateway" is not accurate data; real
per-product grouping needs the service-health matview to group API
Gateway requests by product first. Tracked as a follow-up.
- The 30-day interval option mentioned in the thread.

## Testing

- typecheck, prettier, ratchet, and unit tests green in CI.
- Pending manual confirmation in Studio that the tooltips read Errors /
Warnings / Infos on both surfaces.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **UI Improvements**
* Updated service health charts to show clearer segment labels for
errors, warnings, and healthy states.
* Refined project usage metrics text to use more user-friendly labels
like “Warnings” and “Errors.”
* Adjusted chart labeling for one usage view so the healthy/OK series is
presented more clearly.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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