## Summary
Full Suite shard 3 (run 29640624429) failed mobile multi-select + Other:
submit payload only had `_other` and dropped `q-priorities: [\"speed\"]`
under load.
Hardens the test to click the Speed **checkbox by accessible name**,
wait for checked, then combine Other (FN-8245 settle discipline).
## Test plan
- [x] Local multi-select planning tests green
- [ ] PR gate
- [ ] Post-merge Full Suite all shards green
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Tests**
* Improved mobile planning-flow test reliability by ensuring
multi-select choices are committed before entering additional “Other”
text.
* Reduced the risk of intermittent CI failures when combining predefined
options with custom responses.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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