[DmfsTask] implement status field handlers

[sunkup]

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[Copilot]

Pull request overview

This PR factors dmfs task “status-related” field mapping (priority, classification, status, completed timestamp, percent complete) out of DmfsTaskProcessor into dedicated DmfsTaskFieldHandler implementations and adds Robolectric unit tests for each handler.

Changes:

• Added PriorityHandler, ClassificationHandler, StatusHandler, CompletedHandler, and PercentCompleteHandler to map dmfs Tasks.* columns into at.bitfire.ical4android.Task.
• Wired the new handlers into DmfsTaskProcessor and removed the inlined mapping code.
• Added handler-level Robolectric tests covering default behavior and known/unknown values.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/src/main/kotlin/at/bitfire/synctools/mapping/tasks/handler/StatusHandler.kt	New field handler mapping dmfs STATUS to iCal Status.
lib/src/main/kotlin/at/bitfire/synctools/mapping/tasks/handler/PriorityHandler.kt	New field handler mapping dmfs PRIORITY into Task.priority.
lib/src/main/kotlin/at/bitfire/synctools/mapping/tasks/handler/PercentCompleteHandler.kt	New field handler mapping dmfs PERCENT_COMPLETE into Task.percentComplete.
lib/src/main/kotlin/at/bitfire/synctools/mapping/tasks/handler/CompletedHandler.kt	New field handler mapping dmfs COMPLETED epoch millis into iCal Completed.
lib/src/main/kotlin/at/bitfire/synctools/mapping/tasks/handler/ClassificationHandler.kt	New field handler mapping dmfs CLASSIFICATION into iCal Clazz.
lib/src/main/kotlin/at/bitfire/synctools/mapping/tasks/DmfsTaskProcessor.kt	Uses the new handlers and removes the previously inlined status-field mapping.
lib/src/test/kotlin/at/bitfire/synctools/mapping/tasks/handler/StatusHandlerTest.kt	Tests for StatusHandler mappings and defaults.
lib/src/test/kotlin/at/bitfire/synctools/mapping/tasks/handler/PriorityHandlerTest.kt	Tests for PriorityHandler default + value passthrough.
lib/src/test/kotlin/at/bitfire/synctools/mapping/tasks/handler/PercentCompleteHandlerTest.kt	Tests for PercentCompleteHandler null/default + common values.
lib/src/test/kotlin/at/bitfire/synctools/mapping/tasks/handler/CompletedHandlerTest.kt	Tests for CompletedHandler null/default + epoch millis conversion.
lib/src/test/kotlin/at/bitfire/synctools/mapping/tasks/handler/ClassificationHandlerTest.kt	Tests for ClassificationHandler known values + unknown handling.