fix(frontend): remove unsupported purchase cancellation assurance

[cristim]

The purchase modal's Execute Now warning promised AWS-style cancellation regardless of the selected provider or product. That reassurance was also inaccurate as a general AWS guarantee. The warning now preserves the immediate upfront charge and approval-bypass disclosure while removing only the unsupported cancellation sentence.

Closes #251.

Independent adversarial gpt-6-astra review approved exact commit 9d7ad04f59275395cfa5ec290677fb0ff4638121 with no actionable findings, under the owner's authorized local-review alternative. The reviewer checked the complete three-file committed diff, provider documentation, committed source and the matching freshly built production artifact.

Fresh independent post-commit checks passed 118 Jest tests and four production-browser scenarios. They exercise the actual modal for AWS, Azure and GCP, exact upfront amounts, include-checkbox totals, approval and reopen behavior, mixed-provider fan-out and phone readability. No execute POSTs were emitted. Independent original-source browser tests and an old-sentence mutation failed specifically on the visible warning after the modal, selected recommendation, amount and mode controls passed. Author checks also passed the existing recommendations browser smoke tests, typecheck, lint, build and normal commit hooks.

The production change is one text line. Browser and provider inputs are synthetic HTTP fixtures at the boundary, exercising the real production frontend without a purchase or live cloud call. The correction makes no new cancellation or refund promise. No permission or execution behavior changes.

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📥 Commits

Reviewing files that changed from the base of the PR and between 6d9a70f and 9d7ad04.

📒 Files selected for processing (3)

• frontend/src/__tests__/purchase-modal-submit.test.ts
• frontend/src/recommendations.ts
• frontend/tests-e2e/execute-now-warning.spec.ts

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