test(fe): null-vs-zero matrix for IC KPI rendering (#1337)

[SharedQA]

What

A not-ingested metric arrives as NULL and must never render as a real 0 — a confident wrong zero misrepresents a contributor (the recurring silent-wrong-number class). Pinned end to end:

• transforms.null-vs-zero: every nullable numeric field × every wire format (integer/decimal1/percent/hours) — NULL stays null, a real 0 renders the formatted zero. 32 parametrized cases so no field/format can regress alone.
• kpi-tile.null: the component renders — for a null value and never a literal 0 (the user-visible symptom), and drops the peer median bar.

Verified

vitest (112 pass), tsc --noEmit, eslint --max-warnings 0 — all clean.

Separate branch from the theme-crash / general regression PR, per request.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: a69dd6a9-cdef-4b5b-b285-bf1e3e505a20

📥 Commits

Reviewing files that changed from the base of the PR and between bddede7 and 7d198d5.

📒 Files selected for processing (2)

• src/api/transforms.null-vs-zero.test.ts
• src/components/widgets/v2/kpi-tile.null.test.tsx

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🧪 Generate unit tests (beta)

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