Add node description tooltips in the Properties panel and on secondary inputs in the graph (#2590)

Add tooltips to secondary inputs in graph/Properties panel, and to nodes in Properties panel

frontend/src/components/views/Graph.svelte

@@ -1069,7 +1069,7 @@
 					<div class="secondary" class:in-selected-network={$nodeGraph.inSelectedNetwork}>
 						{#each exposedInputsOutputs as [input, output]}
 							<div class={`secondary-row expanded ${input !== undefined ? "input" : "output"}`}>
-								<TextLabel tooltip={input !== undefined ? input.name : output.name}>
+								<TextLabel tooltip={(input !== undefined ? `${input.name}\n\n${input.description}` : `${output.name}\n\n${output.description}`).trim()}>
 									{input !== undefined ? input.name : output.name}
 								</TextLabel>
 							</div>

frontend/src/components/widgets/WidgetSection.svelte

@@ -26,7 +26,7 @@
 <LayoutCol class={`widget-section ${className}`.trim()} {classes}>
 	<button class="header" class:expanded on:click|stopPropagation={() => (expanded = !expanded)} tabindex="0">
 		<div class="expand-arrow" />
-		<TextLabel bold={true}>{widgetData.name}</TextLabel>
+		<TextLabel tooltip={widgetData.description} bold={true}>{widgetData.name}</TextLabel>
 		<IconButton
 			icon={widgetData.pinned ? "PinActive" : "PinInactive"}
 			tooltip={widgetData.pinned ? "Unpin this node so it's no longer shown here when nothing is selected" : "Pin this node so it's shown here when nothing is selected"}