Test: cover bulk shipment and checkout component flows

[Agbeleshe]

Summary

Adds automated component coverage for the requested bulk shipment, delivery tier, cargo insurance, and USDC escrow checkout flows.

What changed

• Added drag-and-drop CSV mapping assertions that verify the parsed row reaches deliveriesService.createDelivery with the expected field values.
• Added delivery form coverage for the currently implemented small, medium, and large package-size shipping tiers.
• Added cargo insurance pricing coverage that verifies selecting coverage updates the premium and estimated escrow total.
• Added USDC escrow confirmation coverage for delivery ID, amount, currency, and wallet address mapping.
• Corrected stale escrow test fixtures so success/error callbacks are tested through the actual confirmation interaction.
• Mocked the escrow service boundary to prevent Stellar SDK and network dependencies from entering the component suite.

Validation

• Targeted Jest suites: 4 passed, 52 tests passed.
• Touched-file ESLint: passed with no errors.
• Full Jest suite: attempted; existing unrelated failures remain in wallet services, delivery filters, account menu, audit timeline, balance warning, and handoff QR service resolution.
• Type-check: attempted; existing JSX errors remain in app/page.tsx involving an unclosed h2 and section.

Notes

The current repository implementation exposes package-size tiers rather than dimensional weight inputs, and cargo insurance is represented by mutually exclusive coverage radios rather than a boolean toggle. Tests follow those existing production contracts so they remain executable and stable.

Closes #498
Closes #501
Closes #503
Closes #502

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