- uses old data source for charts
- uses new chart styles
- adapts the chart tooltip to be configurable
- removes animations from tooltip to prevent weird position transitions
- hides tooltip when there's no data
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## Summary by CodeRabbit
* **Improvements**
* Project usage now shows log-based statistics and filled time-series
for request trends.
* UI simplified to display total requests per service; error/warning
counts removed from main view.
* Functions service removed from usage list.
* Chart tooltips hide zero-value series when enabled and support
configurable series labeling.
* **Chores**
* Telemetry adjusted to make error count optional when not available.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Jordi Enric
f237b7bf2e