Populate AIC panel from ai-credits rows in current exports

[Rob Bos (rajbos)]

Problem

The "Estimated Cost & AI Credits Usage" panel was permanently empty for current GitHub AI usage exports, showing:

The AIC fields are present in the data but contain no non-zero values for the selected period.

Those exports (header date,username,product,sku,model,quantity,unit_type,...,aic_quantity,aic_gross_amount,...) emit aic_quantity and aic_gross_amount as a literal 0 on every row. The actual AI credit consumption is carried in quantity (with unit_type = ai-credits) and the cost in gross_amount / net_amount:

2026-09-01,nemo-chen_Barco,copilot,copilot_ai_credit,"Auto: Claude Haiku 4.5",4.212603,ai-credits,0.01,0.04212603,0.04212603,0,1900,...,0,0,16,475,32507,32932

getAICDataStatus / getAICData only read the aic_* columns, so the panel always concluded there was no data.

Fix

src/lib/utils.ts now derives effective AIC values:

• isAICreditRecord() — identifies AI credit rows via sku = copilot_ai_credit or unit_type = ai-credits.
• getEffectiveAICQuantity() — uses aic_quantity when it is non-zero, otherwise falls back to quantity for AI credit rows.
• getEffectiveAICGrossAmount() — uses aic_gross_amount when non-zero, otherwise falls back to gross_amount, then net_amount.

getAICDataStatus and getAICData use these helpers. No changes were needed in AICCostChart.tsx.

Behaviour preserved:

• Older exports that populate aic_quantity / aic_gross_amount still use those values (explicit non-zero values win).
• Rows that are AI credits but have zero consumption still render the empty state.
• Non AI-credit rows (e.g. copilot_premium_request / premium_requests) never derive AIC values, so exports without credits still show the "no AIC fields" state.

Tests

New src/test/aic-credit-fallback.test.ts covers both export shapes: derivation from the current format (day + month aggregation, net_amount fallback), backwards compatibility with explicit aic_* values, the genuine empty state, and non AI-credit rows.

npx vitest run → 252 passed, 1 failed (src/test/smoke-test-validation.test.ts — known pre-existing cold-run timeout flake; passes standalone). npm run build succeeds.

Screenshots

Run against a representative export of the new shape (21 days, 4 users, 3 models, all aic_* columns zero).

Before

After

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