fix(ui): cursor z-index 100, adjacent wraps, panel clamp with reset_size

- CursorRenderer z_index=100 so it renders above all HUD/implant layers
- Adjacent systems uses ImplantTextBlock (wraps) instead of ImplantDataRow (clips)
- Panel calls reset_size() before clamping to get accurate height on first frame

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client/scripts/rendering/cursor_renderer.gd

@@ -56,6 +56,7 @@ var _alpha: float = 0.45
 
 func _ready() -> void:
 	Input.set_mouse_mode(Input.MOUSE_MODE_HIDDEN)
+	z_index = 100  # D-170: cursor must always render above all HUD/implant layers
 	_from = _snapshot()
 
 

client/ui/star_map.gd

@@ -345,11 +345,13 @@ func _draw() -> void:
 	if _info_panel:
 		_info_panel.visible = _selected_system != ""
 		if _info_panel.visible:
+			# Force layout so size.y is accurate for clamping
+			_info_panel.reset_size()
 			var px: float = sz.x - POPUP_WIDTH - POPUP_MARGIN
 			var py: float = POPUP_MARGIN
 			# Clamp to keep panel fully on screen
 			var panel_h: float = _info_panel.size.y
-			if py + panel_h > sz.y - POPUP_MARGIN:
+			if panel_h > 0.0 and py + panel_h > sz.y - POPUP_MARGIN:
 				py = sz.y - panel_h - POPUP_MARGIN
 			px = maxf(POPUP_MARGIN, px)
 			py = maxf(POPUP_MARGIN, py)
@@ -519,7 +521,7 @@ func _rebuild_info_panel() -> void:
 			var neighbor: Dictionary = _node_lookup.get(neighbor_id, {})
 			var n_name: String = neighbor.get("proper_name", "")
 			adj_names.append(n_name if not n_name.is_empty() else neighbor_id)
-		_info_panel.add_component(ImplantDataRow.new(" · ".join(adj_names)))
+		_info_panel.add_component(ImplantTextBlock.new(" · ".join(adj_names)))
 
 
 func _draw_title() -> void: