(#43) Move Duplicate and Delete actions to Edit Alarm

[bfalls]

Fixes #43

• Removed duplicate and delete affordances from alarm list rows so they now only expose edit and enable/disable behaviors, shifting destructive actions into the editor sheet.
• Added an editor action row with cancel, delete, duplicate, and save controls, including proper spacing, discard-changes confirmation/back handling, and save enablement tied to edits and validity, with delete/duplicate limited to edit mode.
• Updated duplication logic to clone the current alarm, append "(copy)" labels when present, and insert the new alarm adjacent to the source, and aligned UI tests with the new callbacks and cancel icon control.