Vouch request: fix #3316 (scheduled task test page crash)

[itskrishna21]

Why do you want to contribute?

I’d like to contribute a focused fix for #3316. The crash happens when a previous scheduled run has an empty payload and parsePacket returns undefined; the presenter then reads .timezone and throws. Fix: add a defensive guard in the scheduled-run payload parsing path to handle empty/invalid packets (skip or default) so the test page loads normally, with a small regression test.

Prior contributions or relevant experience

I’m a software engineer with 3 YOE, an active contributor to mastra.ai, and I have strong TypeScript experience.

[itskrishna21]

Draft PR opened for this vouch request: #3335, It addresses issue #3316 and includes a focused regression test.