fix(wdk): prevent resetting cron job lastRun timestamps to 0 in storage

[Ysh204]

Description

This PR resolves a critical bug in the WDK Cron scheduler utility (packages/wallet/wdk/src/sequence/cron.ts) that caused persisted cron job lastRun timestamps to be overwritten with 0 in localStorage when WDK reloaded or initialized.

The Bug

1. When WDK is instantiated, registered jobs are initialized with lastRun = 0.
2. The background checking loop runJobs() loads the persisted last run timestamps from localStorage asynchronously.
3. If the elapsed time since the persisted lastRun is less than the job's interval, the job's handler is not executed.
4. Because the handler did not execute, the in-memory job.lastRun remained at 0.
5. At the end of runJobs(), syncWithStorage() serialized the in-memory this.jobs (where the job's lastRun was 0) and wrote it back to localStorage, erasing the actual last run timestamp.
6. Consequently, on the very next tick, the scheduler loaded lastRun: 0 and triggered the job prematurely.

In practice, this meant every background cron job (such as checking queued recovery payloads) would run on every single app restart/tab refresh plus exactly 1 tick later, completely ignoring the configured execution interval.

The Fix

Update runJobs() in cron.ts to sync the in-memory job.lastRun state with the loaded lastRun value from storage before evaluating the elapsed time. This ensures that non-triggered jobs preserve their actual persisted timestamps when writing back to storage.

Testing & Verification

• Added a comprehensive unit test suite in packages/wallet/wdk/test/cron.test.ts to verify last run persistence, check skip behavior, and ensure correct interval triggers.
• Verified the tests pass successfully (4ms execution time).
• Verified the tests fail on the original buggy implementation.

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Add wallet-wdk to the changeset

This commit changes packages/wallet/wdk/src/sequence/cron.ts in the public @0xsequence/wallet-wdk package, but the changeset only lists @0xsequence/dapp-client. With the repo's Changesets release flow, only packages named in the frontmatter are versioned/changelogged, so the cron persistence fix will not be published to consumers unless @0xsequence/wallet-wdk is included here as a patch release.

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