[ML 0.1/UI.04.9] - Wire swipe actions to legacy swipe handlers

Blocked by

• #10775

Description

The Compose UI detects swipe gestures and dispatches MessageItemEvent.OnSwipeMessage(message, swipeAction), but the state machine has no handler for this event. The legacy MessageListFragment.onSwipeAction() method contains all the business logic (archive, delete, spam, move, toggle read, toggle star, toggle selection) but is never invoked.

Connect MessageItemEvent.OnSwipeMessage to the legacy swipe action handlers so that swiping a message executes the corresponding action, matching legacy behaviour.

Acceptance Criteria

• MessageItemEvent.OnSwipeMessage is handled in the state machine.
• A MessageListEffect is emitted that triggers the appropriate legacy action.
• The side effect or bridge invokes MessageListFragment's existing swipe handler.
• All swipe action types are supported: Archive, Delete, Spam, Move, Toggle Read, Toggle Star, Toggle Selection.
• No swipe action business logic is migrated - only wiring.
• Behaviour matches the legacy swipe actions.

Out of Scope:

• Changing swipe gesture detection or thresholds.
• Modifying the legacy swipe action implementations.