Fix/assets 3856 stale balance polling chris - #10029
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…ASSETS-3856) The Accounts API reports a zero balance by omission: a token the account no longer holds is absent from balance responses rather than returned as "0". Subscription poll responses are applied with updateMode 'merge' — an object spread that can only add or overwrite keys — so an omitted token keeps its last non-zero balance through every poll cycle until app restart. Adds a repro driving the real subscription pipeline (unlock, startup fetch, AccountsApiDataSource poll) against a mocked Accounts API client, mirroring the reported scenario: a Linea account max-swaps USDC to USDT and the API omits USDC from subsequent polls. NOTE: the first test asserts the DESIRED behavior and intentionally FAILS on current code (expected "0", received "100"); it becomes the regression test once a fix lands. The second test (explicit zero through the same pipeline) passes, isolating the defect to omission handling. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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The entry cited #10029, a number guessed before the PR existed. CI's changelog check requires the entry to link the PR that introduces the change, which is #10037, and failed with "There are changes made to this package that may not be reflected in the changelog". changelog:validate only checks formatting, so this passed locally while the CI check did not.
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