Reject native AI Credits reports

[asizikov]

Summary

June and later billing exports use native AI Credits units, which this preview app does not support yet. This PR rejects those reports early with a clear message and clarifies that the app currently accepts April and May PRU vs usage-based billing reports.

Changes

Commit	Change
fix: reject native AI Credits reports	Adds first-row report format validation so native AI Credits reports fail before aggregation, with tests for rejection and PRU acceptance.
fix: clarify supported report uploads	Updates upload-page helper copy to describe the supported April and May report scope.

Testing

• npm run build
• npm run lint -- --quiet
• npm test

Checklist

• Specs lint passes (npm run lint)
• Tests updated if applicable
• Documentation updated if applicable

[Copilot]

Pull request overview

This PR rejects unsupported native AI Credits billing exports early while clarifying the upload UI around the currently supported April/May PRU vs usage-based billing CSV reports.

Changes:

• Adds first-data-row report format validation before pipeline aggregation.
• Introduces a specific unsupported native AI Credits report error.
• Updates parser and pipeline tests plus upload helper copy.

Show a summary per file

File	Description
src/pipeline/runPipeline.ts	Validates header and first record format before analysis/processing.
src/pipeline/runPipeline.test.ts	Covers native AI Credits rejection and existing pipeline behavior.
src/pipeline/parser.ts	Adds native AI Credits report detection and error type.
src/pipeline/parser.test.ts	Tests native report rejection and PRU acceptance without exceeds_quota.
src/components/UploadPage.tsx	Updates upload copy to describe supported April/May reports.

Copilot's findings

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• Files reviewed: 5/5 changed files
• Comments generated: 0