Added selectable container that can be focused with keyboard shortcut.

scripts/terminal_panel.gd

@@ -0,0 +1,25 @@
+@tool
+extends SelectableContainer
+signal command_requested(command: String)
+
+@onready var output: RichTextLabel = $Output
+@onready var command_input: LineEdit = $Command
+
+func _ready() -> void:
+	super._ready()
+	if Engine.is_editor_hint():
+		return
+	command_input.text_submitted.connect(_submit)
+
+func _submit(command: String) -> void:
+	if command.strip_edges().is_empty():
+		return
+	append_output("$ " + command + "\n")
+	command_input.clear()
+	if command_requested.get_connections().is_empty():
+		append_output("No SSH transport connected. Command was not sent.\n")
+	else:
+		command_requested.emit(command)
+
+func append_output(text: String) -> void:
+	output.add_text(text)