Add tooltips to all buttons and tweak hover colors

src/app/components/BtnMenu.tsx

@@ -7,13 +7,14 @@ type BtnMenuProps = {
 	icon?: keyof typeof Octicon,
 	label?: string,
 	relative?: boolean,
+	tooltip?: string,
 	children: ComponentChildren,
 }
-export function BtnMenu({ icon, label, relative, children }: BtnMenuProps) {
+export function BtnMenu({ icon, label, relative, tooltip, children }: BtnMenuProps) {
 	const [active, setActive] = useFocus()
 
 	return <div class={`btn-menu${relative === false ? ' no-relative' : ''}`}>
-		<Btn icon={icon} label={label} onClick={setActive} />
+		<Btn {...{icon, label, tooltip}} onClick={setActive} />
 		{active && <div class="btn-group">
 			{children}
 		</div>}