fix(perps): preserve Lighter executed size on cancellation

[abretonc7s]

Explanation

Lighter clears remaining_base_amount on cancellation, so initial - remaining incorrectly reports an unfilled canceled order as fully filled. Prefer the validated optional filled_base_amount; retain the existing calculation when the field is omitted.

References

• Consumer and temporary package patch: feat(perps): integrate Lighter with funded Lite order entry metamask-mobile#34865
• Reusable Core recipe and contract
• Controller driver

Live controller proof

The recipe invokes PerpsController.getOrders() through the real Lighter provider and HTTP client. No Jest or mocked venue responses. The existing Mobile signer supplies read-token signatures; venue writes and transaction signing are blocked.

Same testnet account 59, key slot 8, BTC cancellation 844424924447876, client receipt 188515645512169:

Read	Original BTC	Remaining BTC	Filled BTC	Recipe
Live Lighter response	0.00029	0	0	Exact receipt matched
Original calculation	0.00029	0	0.00029	Failed as expected
Patched controller	0.00029	0	0	Passed

The published library recipe passed 4/4 steps on the pushed Core commit. No orders, funding or key registration were needed. Reproduction inputs and signer requirements are in the linked contract.

Validation

• Nine regression cases failed before the fix; all 132 focused tests passed afterward.
• Full Perps suite: 3,617 passed, 40 skipped.
• Full production build, changed-file lint, driver typecheck, formatting and package changelog validation passed.
• Independent review found no actionable issues.
• The broader test-inclusive typecheck reports errors in untouched tests, including orderCalculations.advanced-orders.test.ts; no unrelated type fixes are included.

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Localized Lighter order normalization and display logic with backward-compatible fallback when filled_base_amount is omitted; no trading, auth, or signing path changes.

Overview
Fixes incorrect fully-filled display for Lighter orders that were canceled with zero remaining size but no execution. The adapter no longer infers fill size only from initial - remaining; when the venue sends filled_base_amount, that value drives filledSize (including 0 on cancel). If the field is absent, the previous derivation is unchanged.

Validation and types: optional filledBaseAmount is accepted on inactive/active order payloads with strict decimal checks; malformed values still fail as invalid venue data.

Tests: Jest covers adapter and client parsing; a new tsx e2e driver asserts PerpsController.getOrders matches live testnet inactive-order wire data for a known canceled receipt (read-only, no venue writes).

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