Workbench bill editor — tap a workbench, see/edit bills

Tap-to-select chain extended to workbenches (pawn always wins on shared
tile). Mutually exclusive with pawn selection via EventBus —
selecting one clears the other.

New WorkbenchPanel (scenes/ui/workbench_panel.gd, ~432 LOC, layer 18,
right-anchored 360 px) mirrors PawnDetailPanel shape. Bill rows expose
recipe name, mode (FOREVER / COUNT / UNTIL_N), target count, completed
progress, pause, and remove. Add-bill popup filters RecipeCatalog.all()
by accepted_skill so a Hearth only offers cooking recipes.

Supporting plumbing:
- EventBus.workbench_selected / workbench_deselected signals.
- Workbench.remove_bill() — interrupts mid-craft cleanly via
  on_craft_interrupted() before erasing.
- RecipeCatalog.all() static enumerator + Recipe.display_name() helper.
- World.workbench_at_tile() lookup.
- i18n keys ui.bill.* and ui.workbench.* in strings.gd.

Closes the deferred Phase 17 "Bill UI for workbenches" item. Player-
built workbenches are now functionally configurable; before this
landed, only world.gd-hardcoded bills worked.

scenes/world/selection.gd

@@ -14,6 +14,9 @@ const CLICK_MAX_DURATION_MS: int = 300
 
 var _pathfinder: Pathfinder = null
 var _selected_pawn: Pawn = null
+## Currently selected workbench, or null.  Mutually exclusive with _selected_pawn —
+## selecting one clears the other (see _select / _select_workbench).
+var _selected_workbench: Workbench = null
 var _camera = null  # Camera2D (CameraRig) — set via bind_camera(); duck-typed to avoid circular preload
 
 # When Designation paint mode is active this flag is raised by Designation so
@@ -62,23 +65,32 @@ func _unhandled_input(event: InputEvent) -> void:
 	# ── Keyboard: Escape → deselect (lowest-priority; consumed last) ─────────────
 	# Designation._input handles Escape first; panels handle it in _unhandled_input
 	# before reaching here.  If we still see it and have a selection, consume it.
-	if event.is_action_pressed("cancel") and _selected_pawn != null:
-		_deselect()
-		get_viewport().set_input_as_handled()
-		Audit.log("selection", "escape: deselected")
-		return
+	if event.is_action_pressed("cancel"):
+		if _selected_pawn != null:
+			_deselect()
+			get_viewport().set_input_as_handled()
+			Audit.log("selection", "escape: deselected pawn")
+			return
+		if _selected_workbench != null:
+			_deselect_workbench()
+			get_viewport().set_input_as_handled()
+			Audit.log("selection", "escape: deselected workbench")
+			return
 
 	# ── Mouse: only handle button events below ───────────────────────────────────
 	if not (event is InputEventMouseButton):
 		return
 
-	# ── Right-click: cancel designation (if active) or deselect pawn ─────────────
+	# ── Right-click: cancel designation (if active) or deselect pawn / workbench ──
 	if event.button_index == MOUSE_BUTTON_RIGHT and event.pressed:
 		# Designation cancellation is handled by Designation._input; if we see
-		# this right-click, no designation was active.  Deselect any selected pawn.
+		# this right-click, no designation was active.  Deselect whatever is selected.
 		if _selected_pawn != null:
 			_deselect()
 			get_viewport().set_input_as_handled()
+		elif _selected_workbench != null:
+			_deselect_workbench()
+			get_viewport().set_input_as_handled()
 		return
 
 	if event.button_index != MOUSE_BUTTON_LEFT:
@@ -114,14 +126,23 @@ func _handle_click(screen_pos: Vector2) -> void:
 		floori(world_pos.y / float(Pawn.TILE_SIZE_PX)),
 	)
 
-	# Click on a pawn → select.
+	# Click on a pawn → select.  Pawn wins over workbench when they share a tile
+	# (a pawn working at a bench is selectable; tap empty bench tile to inspect bills).
 	var hit_pawn: Pawn = World.pawn_at_tile(tile)
 	if hit_pawn != null:
 		_select(hit_pawn)
 		return
 
-	# Empty tile with no current selection → no-op.
+	# Click on a workbench → open the bill-editor panel.
+	var hit_workbench = World.workbench_at_tile(tile)
+	if hit_workbench != null:
+		_select_workbench(hit_workbench)
+		return
+
+	# Empty tile with no current pawn selection → also clear any workbench selection.
 	if _selected_pawn == null:
+		if _selected_workbench != null:
+			_deselect_workbench()
 		return
 
 	# Empty walkable tile with a selection → queue a forced job. Decision picks
@@ -140,6 +161,9 @@ func _handle_click(screen_pos: Vector2) -> void:
 func _select(pawn: Pawn) -> void:
 	if _selected_pawn == pawn:
 		return
+	# Mutual exclusion with workbench selection: clear it before promoting pawn.
+	if _selected_workbench != null:
+		_deselect_workbench()
 	if _selected_pawn != null:
 		_selected_pawn.set_selected(false)
 		EventBus.pawn_deselected.emit()
@@ -159,6 +183,28 @@ func _deselect() -> void:
 	_selected_pawn = null
 
 
+## Select a workbench → opens the bill-editor panel via EventBus.
+## Mutually exclusive with pawn selection: clears _selected_pawn first.
+func _select_workbench(wb) -> void:
+	if _selected_workbench == wb:
+		return
+	if _selected_pawn != null:
+		_deselect()
+	if _selected_workbench != null:
+		EventBus.workbench_deselected.emit()
+	_selected_workbench = wb
+	EventBus.workbench_selected.emit(wb)
+	Audit.log("selection", "selected workbench %s at %s" % [wb.label_text, wb.tile])
+
+
+func _deselect_workbench() -> void:
+	if _selected_workbench == null:
+		return
+	Audit.log("selection", "deselected workbench %s" % _selected_workbench.label_text)
+	_selected_workbench = null
+	EventBus.workbench_deselected.emit()
+
+
 ## Cycle the selection forward (dir=1) or backward (dir=-1) through World.pawns.
 ## Wraps around.  If no pawn currently selected, picks World.pawns[0].
 ## Pans the camera to the newly selected pawn's tile.