fix(perps-controller): degrade quietly when optional messenger actions are missing

[abretonc7s]

Explanation

RewardsIntegrationService only recognised the "has not been registered" error for a missing optional action. A host whose child messenger doesn't delegate the action gets "has not been delegated to PerpsController" instead. In that case the fee waiver, rewards discount, data-lake report and watchlist sync logged logger.error, and the data-lake report also retried. NetworkController, DataLake and AUS also logged errors when the action was simply unregistered.

An internal isMissingActionHandlerError(error, action) matches the full Messenger message for the action the call site attempted, in either form. Each AUS and NetworkController call checks only its own action. A missing handler deeper in a delegated dependency, such as AUS lacking AuthenticationController:getBearerToken, is still reported, and so are injected-rewards failures. The helper is used only for optional actions:

Action	Class	When missing
SubscriptionController:getBenefits, :registerAddress	optional	no source / DI fallback
NetworkController:getState, :getNetworkClientById (rewards discount)	optional	no discount, debug log
AuthenticationController:getBearerToken (data lake)	optional	skipped, no retry, trace ended
AuthenticatedUserStorageService:get/putNotificationPreferences	optional	local watchlist kept; AUS stays source of truth on the next hydration (init, toggleTestnet, switchProvider)
Account lookups; RFF in the Lighter gate and the kill switch	already silent	unchanged
RFF in the ctor and startEligibilityMonitoring, GeolocationController, KeyringController:*, TransactionController, findNetworkClientIdByChainId	required	still an error

Toggles made while the AUS hydration read is in flight are now replayed onto the remote watchlist instead of being overwritten (a pre-existing race). Tests use a real child Messenger that delegates only the given actions, plus real nested Messenger calls for handlers that fail on a missing dependency of their own.

References

• Undelegated-action errors seen in the Web Terminal host. Its stub handlers can go after this lands.
• Follow-up: a typed MissingActionHandlerError (action and calling namespace) in @metamask/messenger would replace the message match, and separate a handler re-calling the same action from a truly missing one.

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

Medium Risk
Changes fee, reporting, and watchlist sync behavior across messenger integrations; degradation is intentional but affects how partial hosts behave at runtime.

Overview
Hosts that do not register or delegate optional messenger actions (e.g. Web Terminal) no longer get error logs and retries for integrations Perps can live without. A shared isMissingActionHandlerError helper treats both “has not been registered” and “has not been delegated to …” as a missing handler only for the action that was called, so failures inside a delegated handler (missing nested dependency) still surface as real errors.

Optional paths now degrade: subscription benefits/registration fall back like before; rewards discount skips with a debug log when NetworkController reads are absent; data-lake reporting skips without retry and closes the trace when there is no bearer token; AUS watchlist read/write skips keep local watchlist state instead of reverting toggles. Required actions (geolocation, keyring, etc.) are unchanged.

Watchlist: toggles made while an AUS hydration read is in flight are recorded and replayed on top of the remote list when it arrives, fixing a race where late hydration could wipe user favorites.

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