[JOY (JOY)]

Upstream Sync - v2.12.1

Auto-merge with upstream v2.12.1 failed due to conflicts.

To resolve:

1. Check out this branch locally
2. Resolve conflicts
3. Push and merge this PR
4. Then create tag v2.12.1 to trigger Docker build

Upstream release notes

[claude]

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[coderabbitai]

Walkthrough

Warning

Review details and warnings were omitted to fit the comment limit.

[gemini-code-assist]

Code Review

This pull request introduces significant infrastructure and tooling improvements, including a new PostHog analytics provider, a migration of paginated lists to table-based layouts, and the addition of mutation testing and cognitive complexity gates. My review identified several potential runtime errors related to optional chaining in analytics configuration access and a few TypeScript narrowing issues in the new filter handling logic. I have provided actionable suggestions to address these stability concerns.

[gemini-code-assist]

Since analyticsConfig is optional, accessing analyticsConfig?.account_link_info.source will throw a TypeError if analyticsConfig is undefined. Use optional chaining on account_link_info as well to prevent runtime crashes.

Suggested change

	Source: analyticsConfig?.account_link_info.source ?? 'Profile dropdown',
	Source: analyticsConfig?.account_link_info?.source ?? 'Profile dropdown',

[gemini-code-assist]

Since analyticsConfig is optional, accessing analyticsConfig?.account_link_info.source will throw a TypeError if analyticsConfig is undefined. Use optional chaining on account_link_info as well to prevent runtime crashes.

Suggested change

	Source: analyticsConfig?.account_link_info.source ?? 'Profile dropdown',
	Source: analyticsConfig?.account_link_info?.source ?? 'Profile dropdown',

[gemini-code-assist]

Since analyticsConfig is optional, accessing analyticsConfig?.account_link_info.source will throw a TypeError if analyticsConfig is undefined. Use optional chaining on account_link_info as well to prevent runtime crashes.

Suggested change

	}, [ initialScreen, analyticsConfig?.account_link_info.source, onNextStep, csrfQuery, queryClient, onRewardsLoginSuccess ]);
	}, [ initialScreen, analyticsConfig?.account_link_info?.source, onNextStep, csrfQuery, queryClient, onRewardsLoginSuccess ]);

[gemini-code-assist]

Since analyticsConfig is optional, accessing analyticsConfig?.account_link_info.source will throw a TypeError if analyticsConfig is undefined. Use optional chaining on account_link_info as well to prevent runtime crashes.

        analyticsConfig?.account_link_info?.source !== 'Profile' && analytics.logEvent(analytics.EventTypes.ACCOUNT_LINK_INFO, {\n          Source: analyticsConfig?.account_link_info?.source ?? 'Profile dropdown',

[gemini-code-assist]

Since analyticsConfig is optional, accessing analyticsConfig?.account_link_info.source will throw a TypeError if analyticsConfig is undefined. Use optional chaining on account_link_info as well to prevent runtime crashes.

Suggested change

	}, [ recaptcha, sendCodeFetchFactory, isAuth, onSubmit, analyticsConfig?.account_link_info.source ]);
	}, [ recaptcha, sendCodeFetchFactory, isAuth, onSubmit, analyticsConfig?.account_link_info?.source ]);

[gemini-code-assist]

If crossChainTxsFeature.bridgeIds is undefined or not loaded yet, accessing .length will throw a TypeError. Use optional chaining or fallback to an empty array to prevent runtime crashes.

    const bridgeIds = crossChainTxsFeature.bridgeIds;\n\n    if (hasFocalChain || !bridgeIds || bridgeIds.length === 0) {\n      return;\n    }\n\n    return bridgeIds.join(',');

[gemini-code-assist]

TypeScript control flow analysis might not narrow pendingFilters.current to be non-null after the if block, leading to 'Object is possibly null' compilation errors under strict null checks. Using a local variable safely narrows the type.

  const handleFilterChange = React.useCallback(<T extends keyof AdvancedFilterParams>(field: T, val: AdvancedFilterParams[T]) => {\n    let currentPending = pendingFilters.current;\n    if (currentPending === null) {\n      currentPending = { ...latestFilters.current };\n      pendingFilters.current = currentPending;\n      queueMicrotask(() => {\n        const nextFilters = pendingFilters.current ?? {};\n        pendingFilters.current = null;\n        onFilterChange(nextFilters.age ? omit(nextFilters, AGE_RANGE_FIELDS) : nextFilters);\n      });\n    }\n    currentPending[field] = val;\n  }, [ onFilterChange ]);

[gemini-code-assist]

Code Review

This pull request introduces major tooling and feature upgrades, including upgrading Node.js to v24, integrating PostHog analytics via a provider-neutral facade, adding cognitive-complexity and mutation-testing gates, and optimizing Playwright visual tests. It also implements ERC-8056 token multiplier support, replaces mobile list views with scrollable tables, and refactors paginated query hooks to prevent redundant requests. Feedback on the changes highlights a potential runtime error in buildAppActionUrl when parsing relative URLs, and a potential undefined assignment in AddressFilter when handling empty arrays.

[gemini-code-assist]

The new URL() constructor throws if the URL is relative. If template can be a relative path, this will cause a runtime error. Use a base URL to safely resolve relative paths.

try {
    const url = new URL(substituted, 'https://blockscout.com');
    url.searchParams.set('utm_source', 'blockscout');
    url.searchParams.set('utm_medium', UTM_MEDIUM[source]);
    return url.toString();
  } catch {
    return undefined;
  }

[gemini-code-assist]

Accessing value[0] without checking if the array is empty can lead to undefined being assigned to mode, which may cause runtime issues if AddressFilterMode expects a string.

const newVal = [ ...prev ];
      if (value.length > 0) {
        newVal[index] = { ...newVal[index], mode: value[0] as AddressFilterMode };
      }
      return newVal;

[claude]

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