Replace text-only tooltips with custom richly styled tooltips (#3436)

* Replace the title attribute with custom FloatingMenu tooltips

* Separate tooltip labels and descriptions into two styled blocks

* Move keyboard shortcut tooltips to a separate section at the bottom

* Update shortcut key styling in tooltips and hints bar

* Fix .to_string()

frontend/src/components/widgets/buttons/ImageButton.svelte

@@ -8,7 +8,9 @@
 	export let image: string;
 	export let width: string | undefined;
 	export let height: string | undefined;
-	export let tooltip: string | undefined = undefined;
+	export let tooltipLabel: string | undefined = undefined;
+	export let tooltipDescription: string | undefined = undefined;
+	export let tooltipShortcut: string | undefined = undefined;
 	// Callbacks
 	export let action: (e?: MouseEvent) => void;
 
@@ -17,7 +19,17 @@
 		.join(" ");
 </script>
 
-<img src={IMAGE_BASE64_STRINGS[image]} style:width style:height class={`image-button ${className} ${extraClasses}`.trim()} title={tooltip} alt="" on:click={action} />
+<img
+	src={IMAGE_BASE64_STRINGS[image]}
+	style:width
+	style:height
+	class={`image-button ${className} ${extraClasses}`.trim()}
+	data-tooltip-label={tooltipLabel}
+	data-tooltip-description={tooltipDescription}
+	data-tooltip-shortcut={tooltipShortcut}
+	alt=""
+	on:click={action}
+/>
 
 <style lang="scss" global>
 	.image-button {