fix(charts): a fieldless count aggregate keyed its value column undefined (framework#3701)

[os-zhuang]

Companion to objectstack-ai/objectstack#3725 (framework issue #3701).

Context

framework#3701 pinned down what an object-bound chart aggregate names its result columns: the raw field names it was given — groupBy for the category, field for the value, with no sum_-style decoration (unlike a dataset measure) — plus the literal count when a count omits field, which is the alias the engine projects COUNT(*) under. os validate now lints react page sources against that convention, so every path that builds these rows has to honour it exactly.

The bug

Three of the four paths did. The odd one out was count — the one function that may legitimately omit field — because every row builder read params.field directly:

• aggregateRecords (plugin-charts) and ObjectDataSource.aggregateClientSide (data-objectstack) emitted { [groupBy]: key, [undefined]: value }, i.e. a column literally named undefined that no axis binding could ever name;
• the legacy analytics path was worse: it remapped the server's count measure onto params.field and deleted the original key, throwing away the value the server had returned before the chart ever saw it.

Net effect: <ObjectChart aggregate={{ function: 'count', groupBy: 'status' }} /> rendered axes and no bars.

The fix

All of them now resolve the column through one helper (aggregateValueKey), so a fieldless count lands under count:

• plugin-charts — aggregateValueKey + COMPARISON_SUFFIX exported from ObjectChart.tsx; the structured-groupBy alias, the comparison-overlay merge, and the synthesized comparison series all derive from it (count__comparison instead of undefined__comparison).
• data-objectstack — the analytics remap, the missing-measure guard, and aggregateClientSide all use the same rule.
• aggregate.field is typed optional throughout, matching the spec's new ChartAggregateSchema.

Charts that name a field are unchanged — aggregateValueKey returns field whenever it is present.

Verification

• New ObjectChart.aggregateResultColumns.test.ts pins the convention, including the regression: a fieldless count must not produce a key named undefined.
• plugin-charts + data-objectstack: 232 tests pass (20 files).
• type-check clean on both packages.

🤖 Generated with Claude Code

https://claude.ai/code/session_01UMHZBHTjH4rw8xmDYirFC7

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✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	27.9 KB	350 KB
Entry file	index-CcfVApXt.js	—
Status	PASS	—

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📦 Bundle Size Report

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Size Limits

• ✅ Core packages should be < 50KB gzipped
• ✅ Component packages should be < 100KB gzipped
• ⚠️ Plugin packages should be < 150KB gzipped