Built the lease management

[Qoder-Undefined]

[FE-47] Build lease management UI — create on-chain lease agreements and view lease terms
Overview
Assets can be leased to third parties with terms recorded on the Stellar blockchain. This UI allows creating a lease, viewing its terms, and terminating it. Depends on BE-64.

Context
Add a "Lease" section to the asset detail page Overview tab (or a dedicated sub-tab)
API endpoints (from BE-64): POST /stellar/assets/:id/lease, GET /stellar/assets/:id/lease, PATCH /stellar/assets/:id/lease/terminate
Acceptance Criteria
If no active lease: show "Create Lease" button with form: lessee Stellar address, start date, end date, monthly rent (XLM), deposit amount
Form validation: end date must be after start date, rent must be > 0
On submit: show "Recording on Stellar..." loader, display success with transaction hash
If active lease: show lease details card — lessee address, period, monthly rent, deposit, days remaining, transaction hash
"Terminate Lease" button (admin only) with confirmation dialog: "This will record the termination on-chain. Are you sure?"
Lease duration countdown chip (e.g., "127 days remaining")
closes #984

[FE-48] Build insurance management UI — attach insurance policies to assets on-chain
Overview
Insurance details for assets can be stored on the Stellar blockchain for immutable record-keeping. This UI allows attaching an insurance policy to an asset and viewing the policy details. Depends on BE-64.

Context
Add an "Insurance" section to the asset detail page (Overview tab or sub-tab)
API endpoints (from BE-64): POST /stellar/assets/:id/insurance, GET /stellar/assets/:id/insurance
Off-chain insurance records (without blockchain) are a future consideration
Acceptance Criteria
Show current insurance status on the asset detail page: "No Insurance Recorded" or a policy summary card
"Add Insurance" button opens a form: insurer name, policy number, coverage amount, premium (annual), start date, end date
On submit: records to blockchain, shows confirmation with tx hash
Policy card shows: insurer, policy number, coverage amount, premium, dates, status chip (ACTIVE / EXPIRING / EXPIRED based on end date), transaction hash
Expiring policies (within 30 days) show a warning banner: "Policy expires in X days. Renew soon."
closes #985

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