Fix job queueing system: add JobId tracking for failed job reassignment

- Add JobId (rolling u16 counter) to track jobs through their lifecycle
- Add job_id field to all Task variants (Idle, GoTo, ChopTree, HaulCargo, DropHauled)
- Add unclaim_job() method to requeue failed jobs for reassignment
- Change task failure paths to use unclaim_job() instead of complete_job_by_id()
  - This allows failed jobs to be picked up by another dorf instead of being stuck
- Add to_job_kind() and get_job_id() helper methods to Task
- Fix pathfinding is_standable_tile debug logging spam
- Fix chunk bounds check in ChunkData::is_standable (was checking wrong z range)

src/entities/sentient/dorf.rs

@@ -4,6 +4,7 @@ use crate::constants::*;
 use crate::entities::behaviour::{EntityBehaviourRegistry, EntityType};
 use crate::entities::cargo::{CarryVisualState, HaulSlot};
 use crate::entities::shared_components::Ambulatory;
+use crate::entities::tasks::job_queue::JobId;
 use crate::entities::tasks::{IdleState, Task, TaskQueue, TaskState};
 use crate::game::SpawnDelay;
 use crate::world::VisibleGameEntity;
@@ -57,6 +58,7 @@ impl Dorf {
             carry_visual: CarryVisualState::new(normal_sprite, carry_sprite),
             task_queue: TaskQueue {
                 tasks: VecDeque::from([Task::Idle {
+                    job_id: JobId::default(),
                     origin,
                     sigma_world: behaviour.idle.sigma_world,
                     state: IdleState::Picking {