fix: flow step picker layout and single hover/keyboard highlight (#10488)

* fix: keep flow step picker rows on one line and highlight only one

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: restore hover on standalone picker rows and drop phantom ai slots

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: drop inert picker resize and align hub rows with workspace rows

The step picker popover carried `!resize` but computes `overflow: visible`, so CSS
`resize` never applied and the handle did nothing. Dropping it also pins the inner
height at 464px, keeping `displayPath` off everywhere except the content-sized
trigger picker.

Hub rows there rendered summary and path inside a fixed 28px button; give them the
same `h-auto min-h-7 py-1` the workspace rows got. Guard `hover:bg-transparent` on
`onHover` in both pickers so all three agree, and drop the unconditional `title` on
TopLevelNode, which put a native tooltip on every kind button.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: keep GenAiQuick's CSS hover when it is not wired into the shared index

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

frontend/src/lib/components/flows/content/FlowInputsQuick.svelte

@@ -217,6 +217,13 @@
 		}
 	}
 
+	// Mouse and keyboard share this one index, so rows report hover on mousemove rather than
+	// mouseenter: arrow keys scroll the list, which slides a row under a stationary cursor and
+	// fires mouseenter, which would otherwise hijack the selection mid-navigation.
+	function hover(index: number) {
+		selectedByKeyboard = index
+	}
+
 	onMount(() => {
 		$insertButtonOpen = true
 	})
@@ -247,9 +254,24 @@
 		preFilter
 		untrack(() => onPrefilterChange(preFilter))
 	})
-	let aiLength = $derived(
-		funcDesc?.length > 0 && !disableAi && selectedKind != 'flow' && preFilter == 'all' ? 2 : 0
+	// Gates the two AI rows and their slots in the index space; both must agree or arrow keys land
+	// on indices that render nothing.
+	let showAiRows = $derived(
+		!disableAi &&
+			funcDesc?.length > 0 &&
+			kind != 'failure' &&
+			kind != 'preprocessor' &&
+			(selectedKind == 'script' || selectedKind == 'trigger') &&
+			preFilter == 'all'
 	)
+	let aiLength = $derived(showAiRows ? 2 : 0)
+
+	// Every result row lives in one keyboard index space, and hovering a row moves that index, so
+	// mouse and keyboard can never highlight two different rows. Offsets follow the render order.
+	let inlineOffset = $derived(topLevelNodes.length)
+	let aiOffset = $derived(inlineOffset + (inlineScripts?.length ?? 0))
+	let workspaceOffset = $derived(aiOffset + aiLength)
+	let hubOffset = $derived(workspaceOffset + (filteredWorkspaceItems?.length ?? 0))
 </script>
 
 <svelte:window onkeydown={onKeyDown} />
@@ -281,8 +303,9 @@
 										icon: owner.startsWith('f/') ? Folder : User,
 										props: { width: 14, height: 14 }
 									}}
+									title={owner.slice(2)}
 								>
-									{owner.slice(2)}
+									<span class="truncate">{owner.slice(2)}</span>
 								</Button>
 							</div>
 						{/each}
@@ -355,6 +378,7 @@
 					}}
 					{label}
 					selected={selectedByKeyboard === i}
+					onHover={() => hover(i)}
 				/>
 			{/each}
 		{/if}
@@ -395,7 +419,8 @@
 			{#each inlineScripts as [label, lang], i (lang)}
 				<FlowScriptPickerQuick
 					eeRestricted={!$enterpriseLicense && enterpriseLangs.includes(lang)}
-					selected={selectedByKeyboard === i + topLevelNodes.length}
+					selected={selectedByKeyboard === i + inlineOffset}
+					onHover={() => hover(i + inlineOffset)}
 					{enterpriseLangs}
 					{label}
 					lang={lang == 'docker' ? 'bash' : lang}
@@ -419,13 +444,14 @@
 			{/each}
 		{/if}
 
-		{#if !disableAi && funcDesc?.length > 0 && kind != 'failure' && kind != 'preprocessor' && (selectedKind == 'script' || selectedKind == 'trigger') && preFilter == 'all'}
+		{#if showAiRows}
 			<ul class="transition-all">
 				<li
 					><GenAiQuick
 						{funcDesc}
 						lang="TypeScript"
-						selected={selectedByKeyboard === inlineScripts?.length + topLevelNodes.length}
+						selected={selectedByKeyboard === aiOffset}
+						onHover={() => hover(aiOffset)}
 						on:click={() => {
 							lang = 'bun'
 							onGenerate()
@@ -436,7 +462,8 @@
 					<GenAiQuick
 						{funcDesc}
 						lang="Python"
-						selected={selectedByKeyboard === inlineScripts?.length + topLevelNodes.length + 1}
+						selected={selectedByKeyboard === aiOffset + 1}
+						onHover={() => hover(aiOffset + 1)}
 						on:click={() => {
 							lang = 'python3'
 							onGenerate()
@@ -463,11 +490,12 @@
 					bind:filteredWithOwner={filteredWorkspaceItems}
 					{filter}
 					kind={selectedKind}
-					selected={selectedByKeyboard - inlineScripts?.length - aiLength - topLevelNodes.length}
+					selected={selectedByKeyboard - workspaceOffset}
 					on:pickScript
 					on:pickFlow
 					{displayPath}
 					{refreshCount}
+					onHover={(i) => hover(workspaceOffset + i)}
 				/>
 			{/await}
 			<div class="pb-1"></div>
@@ -511,15 +539,12 @@
 						}
 						appFilter={selected?.name}
 						kind={selectedKind}
-						selected={selectedByKeyboard -
-							inlineScripts?.length -
-							aiLength -
-							filteredWorkspaceItems?.length -
-							topLevelNodes.length}
+						selected={selectedByKeyboard - hubOffset}
 						on:pickScript
 						bind:loading
 						{displayPath}
 						{refreshCount}
+						onHover={(i) => hover(hubOffset + i)}
 					/>
 				{/await}
 			{/if}

frontend/src/lib/components/flows/content/GenAiQuick.svelte

@@ -1,17 +1,18 @@
 <script lang="ts">
-	import { createBubbler } from 'svelte/legacy';
+	import { createBubbler } from 'svelte/legacy'
 
-	const bubble = createBubbler();
+	const bubble = createBubbler()
 	import { Wand2 } from 'lucide-svelte'
 	import { createEventDispatcher } from 'svelte'
 
 	interface Props {
-		funcDesc: string;
-		selected: boolean;
-		lang: string;
+		funcDesc: string
+		selected: boolean
+		lang: string
+		onHover?: () => void
 	}
 
-	let { funcDesc, selected, lang }: Props = $props();
+	let { funcDesc, selected, lang, onHover = undefined }: Props = $props()
 	const dispatch = createEventDispatcher()
 
 	const onKeyDown = (e: KeyboardEvent) => {
@@ -24,10 +25,13 @@
 
 <svelte:window onkeydown={onKeyDown} />
 <button
-	class="px-3 py-2 gap-2 w-full text-left hover:bg-surface-hover flex flex-row items-center transition-all rounded-md {selected
+	class="px-3 py-2 gap-2 w-full text-left flex flex-row items-center transition-all rounded-md {selected
 		? 'bg-surface-hover'
-		: ''}"
+		: onHover
+			? ''
+			: 'hover:bg-surface-hover'}"
 	onclick={bubble('click')}
+	onmousemove={() => onHover?.()}
 >
 	<Wand2 size={14} class="text-ai" />
 

frontend/src/lib/components/flows/map/InsertModuleInner.svelte

@@ -43,10 +43,12 @@
 	let loading = $state(false)
 	let small = $derived(kind === 'preprocessor' || kind === 'failure')
 
-	let width = $state(0)
 	let height = $state(0)
 	let owners = $state([])
-	let displayPath = $derived(width > 650 || height > 400)
+	// Only the content-sized host (TriggersWrapper) grows past this. The fixed-height hosts top out
+	// at 464px and must stay under the threshold, or every workspace row goes two-line in the step
+	// picker.
+	let displayPath = $derived(height > 480)
 </script>
 
 <div
@@ -58,7 +60,6 @@
 		e.stopPropagation()
 	}}
 	role="none"
-	bind:clientWidth={width}
 	bind:clientHeight={height}
 >
 	<div class="flex flex-row items-center gap-2">
@@ -84,7 +85,7 @@
 
 	<div class="flex flex-row grow min-h-0 gap-2">
 		{#if kind === 'script'}
-			<div class="flex-none flex flex-col text-xs text-primary overflow-auto gap-1">
+			<div class="flex-none w-40 flex flex-col text-xs text-primary overflow-auto gap-1">
 				<TopLevelNode
 					label="Action"
 					selected={selectedKind === 'script'}
@@ -188,14 +189,14 @@
 						/>
 					{/if}
 					{#if customUi?.aiSandbox != false}
-					<TopLevelNode
-						label="AI Sandbox"
-						selected={selectedKind === 'aisandbox'}
-						onSelect={() => {
-							selectedKind = 'aisandbox'
-						}}
-					/>
-				{/if}
+						<TopLevelNode
+							label="AI Sandbox"
+							selected={selectedKind === 'aisandbox'}
+							onSelect={() => {
+								selectedKind = 'aisandbox'
+							}}
+						/>
+					{/if}
 				{/if}
 			</div>
 		{/if}

frontend/src/lib/components/flows/map/InsertModulePopover.svelte

@@ -36,7 +36,7 @@
 <Popover
 	bind:this={popover}
 	portal={portalTarget()}
-	contentClasses="p-2 max-w-lg h-[400px] !resize bg-surface"
+	contentClasses="p-2 max-w-lg h-[480px] bg-surface"
 	class="inline-block"
 	usePointerDownOutside
 	floatingConfig={{

frontend/src/lib/components/flows/pickers/FlowScriptPickerQuick.svelte

@@ -11,6 +11,7 @@
 		selected?: boolean
 		eeRestricted: boolean
 		enterpriseLangs?: string[]
+		onHover?: () => void
 	}
 
 	let {
@@ -18,7 +19,8 @@
 		lang = undefined,
 		selected = false,
 		eeRestricted,
-		enterpriseLangs = []
+		enterpriseLangs = [],
+		onHover = undefined
 	}: Props = $props()
 
 	const dispatch = createEventDispatcher()
@@ -44,12 +46,12 @@
 
 <Button
 	id={`flow-editor-new-${lang}`}
-	{selected}
 	onClick={click}
+	onmousemove={() => onHover?.()}
 	role="menuitem"
 	variant="subtle"
 	unifiedSize="sm"
-	btnClasses="justify-start"
+	btnClasses="justify-start {selected ? 'bg-surface-hover' : onHover ? 'hover:bg-transparent' : ''}"
 >
 	{#if lang}
 		<LanguageIcon {lang} width={13} height={13} />

frontend/src/lib/components/flows/pickers/FlowToplevelNode.svelte

@@ -3,11 +3,12 @@
 	import TopLevelNode from './TopLevelNode.svelte'
 
 	interface Props {
-		label: string;
-		selected?: boolean;
+		label: string
+		selected?: boolean
+		onHover?: () => void
 	}
 
-	let { label, selected = false }: Props = $props();
+	let { label, selected = false, onHover = undefined }: Props = $props()
 	const dispatch = createEventDispatcher()
 	function handleKeydown(event: KeyboardEvent & { currentTarget: EventTarget & Window }) {
 		if (selected && event.key === 'Enter') {
@@ -23,4 +24,4 @@
 
 <svelte:window onkeydown={handleKeydown} />
 
-<TopLevelNode {label} {selected} returnIcon onSelect={click} />
+<TopLevelNode {label} {selected} returnIcon neutral onSelect={click} {onHover} />

frontend/src/lib/components/flows/pickers/PickHubScriptQuick.svelte

@@ -74,6 +74,7 @@
 		displayPath?: boolean
 		apps?: string[]
 		refreshCount?: number
+		onHover?: (index: number) => void
 	}
 
 	let {
@@ -85,7 +86,8 @@
 		items = $bindable([]),
 		displayPath = false,
 		apps = $bindable([]),
-		refreshCount = 0
+		refreshCount = 0,
+		onHover = undefined
 	}: Props = $props()
 
 	let allApps: string[] = $state([])
@@ -199,7 +201,14 @@
 	<ul class="gap-1 flex flex-col">
 		{#each items as item, index (item.path)}
 			<li class="w-full">
-				<Popover class="w-full" placement="right" forceOpen={index === selected}>
+				<!-- Only the selected row may show a tooltip: the Popover opens on its own hover too, and a
+				     row scrolled under a stationary cursor would otherwise open a second one. -->
+				<Popover
+					class="w-full"
+					placement="right"
+					forceOpen={index === selected}
+					disablePopup={index !== selected}
+				>
 					{#snippet text()}
 						<div class="flex flex-col">
 							<div class="text-left text-xs font-normal leading-tight py-0"
@@ -211,10 +220,14 @@
 						</div>
 					{/snippet}
 					<Button
-						selected={selected === index}
 						variant="subtle"
 						unifiedSize="sm"
-						btnClasses="justify-start"
+						btnClasses="justify-start h-auto min-h-7 py-1 {selected === index
+							? 'bg-surface-hover'
+							: onHover
+								? 'hover:bg-transparent'
+								: ''}"
+						onmousemove={() => onHover?.(index)}
 						onClick={() => handlePickScript(item)}
 					>
 						<div class={classNames('flex justify-center items-center')}>
@@ -229,11 +242,11 @@
 						</div>
 
 						<div class="flex flex-col grow min-w-0">
-							<div class="grow truncate text-left font-normal leading-tight py-0.5"
+							<div class="min-w-0 truncate text-left font-normal leading-tight"
 								>{item.summary ?? ''}</div
 							>
 							{#if displayPath && item.path}
-								<div class="grow truncate text-left text-2xs font-thin">
+								<div class="min-w-0 truncate text-left text-2xs font-thin leading-tight">
 									{item.path}
 								</div>
 							{/if}

frontend/src/lib/components/flows/pickers/TopLevelNode.svelte

@@ -19,10 +19,14 @@
 		label: string
 		selected?: boolean
 		returnIcon?: boolean
+		/** Highlight with the neutral hover surface instead of the accent, for transient
+		 * (hover/keyboard) selection rather than the persistent category selection. */
+		neutral?: boolean
 		onSelect: () => void
+		onHover?: () => void
 	}
 
-	let { label, selected, returnIcon, onSelect }: Props = $props()
+	let { label, selected, returnIcon, neutral = false, onSelect, onHover }: Props = $props()
 
 	interface IconConfig {
 		icon: ComponentType
@@ -51,21 +55,23 @@
 </script>
 
 {#snippet iconWithText(icon: ComponentType, showChevron = false, iconClass = '')}
-	{label}
+	<span class="truncate">{label}</span>
 	{#if showChevron}
-		<ChevronRight size={12} class="ml-auto text-secondary" />
+		<ChevronRight size={12} class="ml-auto shrink-0 text-secondary" />
 	{/if}
 {/snippet}
 
 <Button
 	id={`flow-editor-flow-kind-${label.replaceAll(' ', '-').toLowerCase()}`}
-	{selected}
+	selected={neutral ? false : selected}
 	onClick={onSelect}
+	onmousemove={() => onHover?.()}
 	variant="subtle"
 	unifiedSize="sm"
 	startIcon={{ icon: config?.icon }}
+	btnClasses={neutral ? (selected ? 'bg-surface-hover' : 'hover:bg-transparent') : ''}
 >
-	<span class="grow flex items-center gap-2">
+	<span class="grow min-w-0 flex items-center gap-2">
 		{#if config}
 			{@render iconWithText(config.icon, config.showChevron, config.iconClass ?? '')}
 		{/if}

frontend/src/lib/components/flows/pickers/WorkspaceScriptPickerQuick.svelte

@@ -80,6 +80,7 @@
 			| { kind: 'inline' | 'owner' | 'integrations'; name: string | undefined }
 			| undefined
 		refreshCount?: number
+		onHover?: (index: number) => void
 	}
 
 	let {
@@ -91,7 +92,8 @@
 		filter = '',
 		owners = $bindable([]),
 		ownerFilter = $bindable(undefined),
-		refreshCount = 0
+		refreshCount = 0,
+		onHover = undefined
 	}: Props = $props()
 
 	const dispatch = createEventDispatcher()
@@ -163,7 +165,14 @@
 	<ul class="gap-1 flex flex-col">
 		{#each filteredWithOwner ?? [] as { path, hash, summary, marked }, index}
 			<li class="w-full">
-				<Popover class="w-full " placement="right" forceOpen={index === selected}>
+				<!-- Only the selected row may show a tooltip: the Popover opens on its own hover too, and a
+				     row scrolled under a stationary cursor would otherwise open a second one. -->
+				<Popover
+					class="w-full "
+					placement="right"
+					forceOpen={index === selected}
+					disablePopup={index !== selected}
+				>
 					{#snippet text()}
 						<div class="flex flex-col">
 							<div class="text-left text-xs font-normal leading-tight py-0">{summary ?? ''}</div>
@@ -173,10 +182,14 @@
 						</div>
 					{/snippet}
 					<Button
-						selected={selected === index}
 						variant="subtle"
 						unifiedSize="sm"
-						btnClasses="justify-start transition-all"
+						btnClasses="justify-start transition-all h-auto min-h-7 py-1 {selected === index
+							? 'bg-surface-hover'
+							: onHover
+								? 'hover:bg-transparent'
+								: ''}"
+						onmousemove={() => onHover?.(index)}
 						onClick={() => {
 							if (kind == 'flow') {
 								dispatch('pickFlow', { path: path })
@@ -189,7 +202,7 @@
 						}}
 					>
 						<div class="flex flex-col grow min-w-0">
-							<div class="grow min-w-0 truncate text-left">
+							<div class="min-w-0 truncate text-left leading-tight">
 								{#if marked}
 									{@html marked}
 								{:else}
@@ -197,7 +210,7 @@
 								{/if}
 							</div>
 							{#if displayPath && path}
-								<div class="grow min-w-0 truncate text-left text-2xs font-thin">
+								<div class="min-w-0 truncate text-left text-2xs font-thin leading-tight">
 									{path}
 								</div>
 							{/if}

frontend/src/lib/components/home/ListFiltersQuick.svelte

@@ -49,8 +49,9 @@
 				startIcon={icon}
 				unifiedSize="sm"
 				btnClasses="justify-start"
+				title={filter}
 			>
-				{filter}
+				<span class="truncate">{filter}</span>
 			</Button>
 		</div>
 	{/each}