refactor(reporting): extract paginate_dependency helper and fix tests…

[OG-wura]

close #738

PR Description

Summary

Extracts the duplicated pagination logic shared by 4 reporting reports into a
single generic paginate_dependency helper. Also fixes 55 pre-existing
compilation errors in tests.rs that blocked running any tests.

Changes

Refactor — reporting/src/lib.rs

• New types: PaginatedResult<T> (items + data_availability)
• New generic fn: paginate_dependency(env, fetch_page) — bounded loop
  (MAX_DEP_PAGES cap), drains pages until next_cursor == 0
• Refactored 4 reports to use the helper:
  • get_bill_compliance_report_internal
  • get_insurance_report_internal
  • get_top_bills_report_internal
  • get_top_savings_report_internal
• Note: get_savings_report_internal unchanged — it uses a single
  non-paginated get_all_goals call

New tests — reporting/src/paginate_dependency_tests.rs

12 unit tests covering:

• DataAvailability::Missing (first page empty)
• DataAvailability::Complete (cursor=0 within MAX_DEP_PAGES)
• DataAvailability::Partial (cap reached)
• Non-advancing cursor termination guarantee
• Edge cases (empty middle pages, mixed empty/non-empty)

Fixed pre-existing tests.rs errors (55 total)

• Added missing _caller arg to get_savings_report, get_bill_compliance_report,
  get_insurance_report, get_financial_health_report, get_stored_report,
  check_dependencies
• Fixed Result unwrapping for try_ variants across the file
• Added mock family_wallet module for check_dependencies test
• Removed unused CoverageType import

Test results

• 104 passed, 1 pre-existing runtime failure
  (test_verify_dependency_address_set_does_not_write_storage — storage
  accessed outside contract context, pre-dates this PR)
• 12/12 new paginate tests: PASS

[Baskarayelu]

clean refactor - folding the cross-contract dependency pagination into a shared paginate_dependency helper cuts a lot of duplication, and the snapshot tests still line up. merging 👍