test: add comprehensive lifecycle and component test coverage

[codellins]

What

Comprehensive test coverage for order/withdrawal lifecycle events in the indexer and trade UI components.

Issues Resolved

Closes #264
Closes #263
Closes #228
Closes #229

Changes

#264 - Indexer: order lifecycle mapping tests

Added fixtures and tests covering the full order lifecycle from creation through cancellation:

• Tests for ord_crt (create), ord_upd (update), ord_frz (freeze), ord_exe (execute), ord_can (cancel)
• Validates order status transitions and key fields (account, market, order type, price)
• Verifies frozen orders remain queryable with correct status
• Tests idempotency of event dispatch

#263 - Indexer: withdrawal lifecycle mapping tests

Added comprehensive withdrawal lifecycle tests:

• Tests for wth_crt (create), wth_exe (execute), wth_can (cancel)
• Validates entity IDs, account, market, ledger, and status fields
• Tests idempotency across event reruns
• Ensures withdrawal states transition correctly

#228 - Web trade: referral prompt flow

Added full test coverage for ApplyReferralCodePrompt component:

• Render states: with/without account, loading, existing code, completed prompt
• Code normalization to uppercase
• Submission with validation and callback assertions
• Error handling for validation and apply failures
• Button state management during pending operations
• Skip flow and prompt dismissal
• Error clearing on user input

#229 - Web trade: circuit breaker banner

Added comprehensive CircuitBreakerBanner component tests:

• Hidden state when inactive or dismissed
• Visible frozen state with correct message
• Alert role for accessibility
• Amber warning styling verification
• Dismiss button functionality and styling
• Behavior when status remains active after dismissal
• Explanatory copy display with accessible text

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