`get_analytics`/`ShipmentStatusSummary` omit `PartiallyDelivered`/`PartiallyRefunded` counts

[dinahmaccodes]

Tier: Medium
Description: Analytics (types.rs:746-765) has fields for only 6 of 8 statuses. increment_status_count genuinely accumulates a PartiallyDelivered counter in storage, but it's never surfaced — total_shipments won't equal the sum of Analytics's per-status fields once any shipment reaches PartiallyDelivered.
Files: contracts/shipment/src/types.rs:746-765, contracts/shipment/src/lib.rs:1290-1330
Tasks:

• Add PartiallyDelivered/PartiallyRefunded fields to Analytics/ShipmentStatusSummary and populate them from existing storage counters
  Acceptance Criteria:
• Analytics's per-status fields sum to total_shipments for all 8 statuses

[xeexco]

@xeexco has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello, I'm interested in taking this issue on.

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[OkpunTakem]

@OkpunTakem has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I can fix this.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @OkpunTakem to this issue.