fix(ui): address PR #124 review — navigation, error handling, cleanup

- Economics panel: replace dead _gui_input LEFT/RIGHT with public
  navigate() method, wire [ ] keys in main.gd (avoids movement
  key conflict, fixes focus_mode=NONE issue)
- Debug console: add explicit effect guard in econ inject no-commodity
  branch so invalid effects don't fall to commodity-form error
- Snapshot consumer: null-clear GameState.economy_snapshot after
  consuming (matches one-shot consumer invariant)
- Star map: remove duplicate doc comment above set_insert_active()
- Generate script: remove stale comment, dead _WORKTREE_PARENT var,
  dead field extraction in parse_wiki_index, add try/except around
  DB queries

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/scripts/main.gd

@@ -176,6 +176,14 @@ func _unhandled_key_input(event: InputEvent) -> void:
 			# #824: E — toggle Economics Monitor implant panel
 			if economics_panel:
 				economics_panel.toggle_visible()
+		elif event is InputEventKey and event.keycode == KEY_BRACKETLEFT:
+			# #824: [ — cycle economics panel system selector backward
+			if economics_panel and HudGroups.is_app_active("implant/economics"):
+				economics_panel.navigate(-1)
+		elif event is InputEventKey and event.keycode == KEY_BRACKETRIGHT:
+			# #824: ] — cycle economics panel system selector forward
+			if economics_panel and HudGroups.is_app_active("implant/economics"):
+				economics_panel.navigate(1)
 
 
 func _process(delta: float) -> void:

client/scripts/snapshot_consumers.gd

@@ -183,6 +183,7 @@ func consume_economy_snapshot() -> void:
 		return
 	if economics_panel.has_method("receive_economy_data"):
 		economics_panel.receive_economy_data(GameState.economy_snapshot)
+	GameState.economy_snapshot = null
 
 
 # #174: Consume examine result — show overlay when server sends character-filtered observation.

client/ui/debug_console.gd

@@ -287,6 +287,12 @@ func _econ_inject(parts: Array) -> void:
 		magnitude_str = args[2]
 		if args.size() >= 4:
 			ticks_str = args[3]
+	elif args.size() == 3:
+		# 3 args but args[1] isn't shock/boost — bad effect keyword, not a commodity
+		_append_text(
+			"econ inject: effect must be 'shock' or 'boost', got '%s'" % args[1], ERROR_COLOR
+		)
+		return
 	else:
 		# With commodity_id: econ inject <system> <commodity> <effect> <magnitude> [ticks]
 		commodity_id = args[1]

client/ui/implant/economics_panel.gd

@@ -167,10 +167,11 @@ func _load_system_list() -> void:
 		var sid: String = node.get("system_id", "")
 		if not sid.is_empty():
 			_systems.append(node)
-	_systems.sort_custom(func(a: Dictionary, b: Dictionary) -> bool:
-		var na: String = a.get("proper_name", a.get("system_id", ""))
-		var nb: String = b.get("proper_name", b.get("system_id", ""))
-		return na < nb
+	_systems.sort_custom(
+		func(a: Dictionary, b: Dictionary) -> bool:
+			var na: String = a.get("proper_name", a.get("system_id", ""))
+			var nb: String = b.get("proper_name", b.get("system_id", ""))
+			return na < nb
 	)
 	if not _systems.is_empty():
 		selected_system = _systems[0].get("system_id", "")
@@ -256,7 +257,7 @@ func _rebuild_panel() -> void:
 	_panel.add_component(_placeholder_notice)
 
 	_panel.add_component(ImplantSeparator.new())
-	_panel.add_component(ImplantTextBlock.new("◄ ► select · E close"))
+	_panel.add_component(ImplantTextBlock.new("[ ] select system · E close"))
 
 
 func _current_node() -> Dictionary:
@@ -304,27 +305,11 @@ func _on_economy_data_updated(system_id: String, data: Dictionary) -> void:
 		_placeholder_notice.text = "LIVE DATA ACTIVE"
 
 
-# =============================================================================
-# Input — LEFT/RIGHT arrow navigation between systems
-# =============================================================================
-
-
-func _gui_input(event: InputEvent) -> void:
-	if not visible:
-		return
-	if event is InputEventKey and event.pressed and not event.is_echo():
-		match event.keycode:
-			KEY_LEFT:
-				_cycle_system(-1)
-				get_viewport().set_input_as_handled()
-			KEY_RIGHT:
-				_cycle_system(1)
-				get_viewport().set_input_as_handled()
-
-
-func _cycle_system(direction: int) -> void:
+## Cycle the system selector by delta steps (+1 or -1).
+## Called from main.gd _unhandled_key_input — [ and ] keys when panel is active.
+func navigate(delta: int) -> void:
 	if _systems.is_empty():
 		return
-	_selected_idx = wrapi(_selected_idx + direction, 0, _systems.size())
+	_selected_idx = wrapi(_selected_idx + delta, 0, _systems.size())
 	selected_system = _systems[_selected_idx].get("system_id", "")
 	_rebuild_panel()

client/ui/star_map.gd

@@ -135,7 +135,6 @@ func _process(_delta: float) -> void:
 		_dirty = false
 
 
-## Called from main.gd when insert state changes.
 ## Called from main.gd when insert state changes.
 func set_insert_active(active: bool) -> void:
 	_insert_active = active