Fix waypoints

[RCGV1]

The iOS app sends non-expiring waypoints as expire=0; we will now treat those as never expiring and always show them. Additionally, the Date and Time formatted strings sometimes did not display, so we now initialize them instead of using onChange.

[RCGV1]

Fixes #2224

[Copilot]

Pull Request Overview

This PR updates waypoint expiration logic to treat expire=0 as never expiring and always show those waypoints, and fixes date/time display in the Edit Waypoint dialog by initializing formatted strings up front.

• Include non-expiring waypoints (expire == 0) in the live view.
• Initialize selectedDate and selectedTime with current values instead of relying on onChange.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
app/src/main/java/com/geeksville/mesh/ui/map/components/EditWaypointDialog.kt	Move initialization of selectedDate, selectedTime, and epochTime to setup with current calendar values.
app/src/main/java/com/geeksville/mesh/model/UIState.kt	Extend filter to include expire == 0 as a non-expiring waypoint.

Comments suppressed due to low confidence (1)

app/src/main/java/com/geeksville/mesh/model/UIState.kt:565

• Add or update unit tests to verify that waypoints with expire = 0 are correctly retained, and that the filtering logic still excludes expired entries.

            }