#9128 fix(desktop): let computer use type into date and time pickers

Summary

• #9112's type_text gate didn't recognize AXDateTimeArea, the role an NSDatePicker field reports, so typing a time into Clock alarms or Calendar events was refused with "Keyboard focus is not in a text input"
• Date and time pickers now count as text controls, like the legacy date/time field roles already did
• The fixture gains a time picker whose action updates a Time: label, and live.py types an hour into it

Type of Change

• Bug fix

Testing

• Paired benchmark of #9112 against the previous helper (84 episodes): 53 vs 55, McNemar p=0.63; all three lost episodes (calendar-1_3, clock-1_1, clock-1_4) were this refusal on AXDateTimeArea
• live.py on macOS 26: fails on current staging's helper with the same unsupported_action refusal, passes with this fix
• Targeted Clock/Calendar benchmark result is posted below

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing (new tests pass the test-audit authoring gate)
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)