feat(tab-group): make the split pane landing rows outline buttons (#40469)

src/renderer/src/components/tab-group/SplitPaneLanding.tsx

@@ -23,12 +23,9 @@ import {
   ensureSimulatorTab,
   getSimulatorTabForWorktree
 } from '@/lib/simulator/tabs/ensure-simulator-tab'
+import { Button } from '@/components/ui/button'
 import { SplitPaneLandingAgentRow } from './SplitPaneLandingAgentRow'
-import {
-  LANDING_ROW_CLASS,
-  LandingRowShortcut,
-  moveLandingRowFocus
-} from './split-pane-landing-row'
+import { LandingRowLabel, LandingRowShortcut, moveLandingRowFocus } from './split-pane-landing-row'
 
 /** Fills an empty split pane so the user picks what opens there; each action creates into this group. */
 export function SplitPaneLanding({
@@ -142,12 +139,12 @@ export function SplitPaneLanding({
   return (
     <div className="absolute inset-0 overflow-auto scrollbar-sleek bg-background">
       <div className="mx-auto flex min-h-full w-full max-w-sm flex-col justify-center px-4 py-10">
-        <div className="mb-3 px-2.5 text-sm text-muted-foreground">
+        <div className="mb-3 text-sm text-muted-foreground">
           {t('components.tabGroup.splitPaneLanding.heading', 'Open in this pane')}
         </div>
         <div
           ref={listRef}
-          className="flex flex-col gap-1"
+          className="flex flex-col gap-2"
           onKeyDown={(event) => moveLandingRowFocus(event, listRef.current)}
         >
           <SplitPaneLandingAgentRow
@@ -160,7 +157,7 @@ export function SplitPaneLanding({
           ))}
           {canReopen ? (
             <>
-              <div className="mx-2.5 my-1.5 h-px bg-border" />
+              <div className="my-1 h-px bg-border" />
               <LandingRowButton
                 row={{
                   id: 'reopen',
@@ -177,13 +174,17 @@ export function SplitPaneLanding({
           ) : null}
         </div>
         {onClosePane ? (
-          <button
+          <Button
             type="button"
-            className="mt-5 self-center rounded-md px-2.5 py-1 text-xs text-muted-foreground transition-colors hover:bg-accent hover:text-accent-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+            variant="ghost"
+            size="sm"
+            className="mt-4 self-center"
             onClick={onClosePane}
           >
-            {t('components.tabGroup.splitPaneLanding.closePane', 'Close pane')}
-          </button>
+            <span className="text-muted-foreground">
+              {t('components.tabGroup.splitPaneLanding.closePane', 'Close pane')}
+            </span>
+          </Button>
         ) : null}
       </div>
     </div>
@@ -201,10 +202,17 @@ type LandingRow = {
 function LandingRowButton({ row }: { row: LandingRow }): React.JSX.Element {
   const Icon = row.icon
   return (
-    <button type="button" data-landing-row className={LANDING_ROW_CLASS} onClick={row.onSelect}>
-      <Icon className="size-4 text-muted-foreground" />
-      <span className="min-w-0 flex-1 truncate text-left">{row.label}</span>
+    <Button
+      type="button"
+      variant="outline"
+      size="lg"
+      data-landing-row
+      className="w-full justify-start"
+      onClick={row.onSelect}
+    >
+      <Icon className="text-muted-foreground" />
+      <LandingRowLabel label={row.label} />
       <LandingRowShortcut shortcut={row.shortcut} />
-    </button>
+    </Button>
   )
 }

src/renderer/src/components/tab-group/SplitPaneLandingAgentRow.tsx

@@ -2,7 +2,8 @@ import { Bot, ChevronDown } from 'lucide-react'
 import { useAppStore } from '../../store'
 import { useShortcutKeyDetails } from '@/hooks/useShortcutLabel'
 import { useTranslate } from '@/i18n/use-translate'
-import { cn } from '@/lib/utils'
+import { Button } from '@/components/ui/button'
+import { ButtonGroup } from '@/components/ui/button-group'
 import { getAgentCatalog } from '@/lib/agent-catalog/agent-catalog'
 import { AgentIcon } from '@/components/agent/icons/AgentIcon'
 import { focusTerminalTabSurface } from '@/lib/focus-terminal-tab-surface'
@@ -18,9 +19,9 @@ import {
   resolveTerminalAgentTabShortcut
 } from '../terminal-agent-tab-shortcut'
 import { launchAgentTabShortcut } from '../agent-tab-shortcut-launch'
-import { LANDING_ROW_CLASS, LandingRowShortcut } from './split-pane-landing-row'
+import { LandingRowLabel, LandingRowShortcut } from './split-pane-landing-row'
 
-/** The default agent as one row; the chevron opens the + menu's agent list for any other. */
+/** The default agent as a split button; the chevron opens the + menu's agent list for any other. */
 export function SplitPaneLandingAgentRow({
   worktreeId,
   groupId,
@@ -59,36 +60,32 @@ export function SplitPaneLandingAgentRow({
   }
 
   return (
-    // Why: a stretched button keeps the row one click target while the chevron stays its own button.
-    <div
-      className={cn(
-        LANDING_ROW_CLASS,
-        'relative has-[[data-landing-row]:focus-visible]:bg-accent has-[[data-landing-row]:focus-visible]:text-accent-foreground'
-      )}
-    >
-      <button
+    <ButtonGroup className="w-full">
+      <Button
         type="button"
+        variant="outline"
+        size="lg"
         data-landing-row
-        aria-label={label}
-        className="absolute inset-0 rounded-md focus-visible:outline-none"
+        className="min-w-0 flex-1 justify-start"
         onClick={launchDefault}
         autoFocus={autoFocus}
-      />
-      <span className="pointer-events-none flex text-muted-foreground">
-        {defaultAgent ? <AgentIcon agent={defaultAgent} size={16} /> : <Bot className="size-4" />}
-      </span>
-      <span className="pointer-events-none min-w-0 truncate">{label}</span>
+      >
+        {defaultAgent ? <AgentIcon agent={defaultAgent} size={16} /> : <Bot />}
+        <LandingRowLabel label={label} />
+        <LandingRowShortcut shortcut={shortcut} />
+      </Button>
       <DropdownMenu>
         <DropdownMenuTrigger asChild>
-          <button
+          <Button
             type="button"
+            variant="outline"
+            size="icon-lg"
             aria-label={t('components.tabGroup.splitPaneLanding.chooseAgent', 'Choose agent')}
-            className="relative -ml-1.5 flex size-6 items-center justify-center rounded text-muted-foreground transition-colors hover:bg-foreground/10 hover:text-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring data-[state=open]:bg-foreground/10 data-[state=open]:text-foreground"
           >
-            <ChevronDown className="size-3.5" />
-          </button>
+            <ChevronDown className="text-muted-foreground" />
+          </Button>
         </DropdownMenuTrigger>
-        <DropdownMenuContent align="start" sideOffset={6} className="w-64">
+        <DropdownMenuContent align="end" sideOffset={6} className="w-64">
           <QuickLaunchAgentMenuItems
             worktreeId={worktreeId}
             groupId={groupId}
@@ -96,10 +93,7 @@ export function SplitPaneLandingAgentRow({
           />
         </DropdownMenuContent>
       </DropdownMenu>
-      <span className="pointer-events-none ml-auto flex">
-        <LandingRowShortcut shortcut={shortcut} />
-      </span>
-    </div>
+    </ButtonGroup>
   )
 }
 

src/renderer/src/components/tab-group/split-pane-landing-row.tsx

@@ -1,8 +1,9 @@
 import type { ShortcutKeyComboDetails } from '@/hooks/useShortcutLabel'
 import { ShortcutKeyCombo } from '../ShortcutKeyCombo'
 
-export const LANDING_ROW_CLASS =
-  'flex h-9 w-full items-center gap-3 rounded-md px-2.5 text-sm text-foreground transition-colors hover:bg-accent hover:text-accent-foreground focus-visible:bg-accent focus-visible:text-accent-foreground focus-visible:outline-none'
+export function LandingRowLabel({ label }: { label: string }): React.JSX.Element {
+  return <span className="min-w-0 flex-1 truncate text-left">{label}</span>
+}
 
 export function LandingRowShortcut({
   shortcut