Enable native budget simulation

[asizikov]

Summary

Native usage-based billing reports already contain AI Credits quantities and costs, but cost management still disabled budget simulation for those reports. This PR enables the simulator end to end for native reports while preserving transition-period PRU comparison behavior.

Changes

Commit	Change
feat: support native budget simulation parsing	Passes report metadata into budget simulation so native reports use native parsing, date normalization, and included-credit policy context, and removes the Apply-time native report blocker.
feat: enable native budget simulation UI	Shows budget controls/results for native reports, switches native result labels to usage-based billing / AI Credits semantics, and keeps transition reports on PRU blocked-usage copy.

Testing

• npm test
• npm run lint
• npm run build

Checklist

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

[Copilot]

Pull request overview

Enables budget simulation end-to-end for native usage-based billing (AI Credits) reports by wiring report format metadata into the simulator/parsing path and updating the Cost Management UI to display budget controls/results for native reports while preserving transition-period PRU labeling behavior.

Changes:

• Removed the native-report UI blocker and updated Cost Management copy/labels to use AI Credits semantics for native reports.
• Extended runBudgetSimulation to accept report format metadata and switch parsing/date normalization accordingly.
• Added view and simulation tests covering native vs transition report behavior.

Show a summary per file

File	Description
src/views/CostManagementView.tsx	Enables budget simulation UI for native reports and updates labels/copy to AI Credits semantics.
src/views/CostManagementView.test.ts	Adds coverage to ensure native reports show budget controls and AI Credits labels while transition reports keep PRU labeling.
src/utils/budgetSimulation.ts	Threads report metadata through included-credits context and switches parsing for native reports.
src/utils/budgetSimulation.test.ts	Adds a native-report simulation test to validate native parsing + policy context usage.
src/App.tsx	Removes the native simulation apply-time blocker and passes report metadata into budget simulation.

Copilot's findings

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