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fix(studio): stop stacking overlaid area series in report charts (#48034)

Line-style report charts (auth processing time, percentiles, edge
functions, realtime, etc.) hardcoded `stackId="1"` on every `<Area>`, so
recharts summed the series additively instead of overlaying them.

When multiple series share a value (e.g. Max/Min/Avg all `153.98`), they
rendered as three stacked bands at 1x/2x/3x the value, even though the
tooltip showed the true identical values.

## Fix

Default each area to its own `stackId` (its attribute name) so series
overlay, while still honoring an explicit per-attribute `stackId` from
config — matching the existing bar-chart path directly above it.
`normalizeVisibleStackToPercent`, the only flag that would make stacked
areas intentional, is never enabled anywhere.

## Before / after

Before: three equal values drawn at `0→153.98`, `153.98→307.96`,
`307.96→461.94`.
After: all three overlay at `153.98`.

Affects every line-style multi-series report, not just auth.

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

## Summary by CodeRabbit

- **Bug Fixes**
- Improved stacked chart behavior by consistently applying configured
series stacking settings.
- Ensured area charts can overlay correctly when no explicit stacking
configuration is provided.
  - Added safeguards for missing or invalid chart attribute data.

- **Tests**
- Added coverage for configured stack IDs, fallback behavior, empty
values, and invalid inputs.

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

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