Resolve assigned issues #167, #174, #175, and #180

[codeX-james]

Closes astera-hq#167
Closes astera-hq#174
Closes astera-hq#175
Closes astera-hq#180

Summary

• Implement dashboard search/filter/sort upgrades with debounced query, multi-select status chips, extended sort options, URL state persistence, and a status-filter unit test.
• Enforce pool pause policy for deposit and withdraw, document pause policy in-contract, and add pause consistency tests for blocked user ops and allowed admin ops.
• Add frontend error-handling coverage with contract error mapping tests, an ErrorBoundary component plus tests, and extend store failure-path tests.
• Add docs/contract-upgrade-guide.md and link it from docs/mainnet-deployment.md and README.md.

Test plan

• ReadLints on all touched files (no lints reported)
• npm --prefix frontend test -- --runTestsByPath __tests__/lib/dashboardFilters.test.ts __tests__/lib/contracts.test.ts __tests__/components/error-boundary.test.tsx __tests__/lib/store.test.tsx (blocked in this environment: jest not installed)
• cargo test -p pool test_deposit_blocked_when_paused
• cargo test -p pool test_withdraw_blocked_when_paused
• cargo test -p pool test_admin_ops_allowed_when_paused
• note: pool test runs are currently blocked by a pre-existing compile error in contracts/pool/tests/fuzz_tests.rs (repay_invoice call missing the amount argument)

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