fix: refresh recycling when extraData changes

[OskarEichler]

Fix

Include extraData in the recycler data-update trigger so changing it re-evaluates active item types before render.

Problem

extraData is the documented marker for list output that depends on state outside data. The recycler only processed updates when the data reference changed, so an extraData-only render could leave active cells assigned to their previous item-type pool.

The regression initializes a real render stack, changes only extraData, and verifies that the active item is reassigned from standard to featured. It fails on untouched main and passes with the dependency change.

Compatibility / observable changes

• public APIs and callback signatures are unchanged
• extraData identity changes now perform the same recycler update already used for data changes
• unchanged extraData does not add work
• this is independent from fix: forward extraData to the documented getItemType callback #2472, which forwards extraData into the callback itself

No breaking change is intended.

Verification

• focused regression passes
• full Jest suite: 15 suites, 188 tests passed
• library TypeScript check passed
• changed-file ESLint and git diff --check passed
• React Doctor: 100/100
• no dependency, lockfile, native SDK, or Songstats application change

Reviewers’ hat-rack 🎩

• Verify the extraData-only recycling case and intended update cost.
• Run the existing test/type/lint commands on a supported environment.