Fix trigger action updates and dialogue continuation semantics

[Eldbury]

Summary

This PR contains the gameplay/runtime fixes split out from the earlier mixed branch.

Included:

• trigger Object::update(dt) fix so delayed/queued trigger actions actually advance
• dialogue continuation fix around ClearAllActions()
• the gameplay/runtime semantics behind the Endar Spire / Trask / Carth progression fixes
• Area::startDialog() fix to use the resolved conversation resref

Not included:

• developer observability tools
• movie/audio suppression changes
• docs/scripts/evals/log junk

ClearAllActions note

The failure mode here is that the currently executing front action can call ClearAllActions() on its owner while it is still running. The old implementation trims from the back, which can delete the queued continuation that the current action is about to hand off to.

This PR tracks the currently executing action via _executingAction and preserves that active front action and its continuation chain when clearAllActions(false) is called during execution.

I did not use a temporary Action::lock() approach here because the goal is not just to preserve the executing action object; it is to preserve the active front-of-queue handoff/continuation semantics without changing the broader action-locking model.

Verification

• manual Endar Spire progression validation covering the affected sequence/dialogue flow
• local Windows Release build passed
• local unit tests passed
• combined smoke-stack test passed

Expected sibling PR overlap

This branch may need a small follow-up rebase if the dev-tools PR lands first.

Expected overlap is limited to:

• src/libs/game/object/area.cpp
• src/libs/game/object/trigger.cpp

[modawan]

Great, thank you!