feat(mobile): polish composer model/agent controls and selection overlay

Redesign the mobile composer model and agent buttons as borderless, full-bleed
labels that hug their content, truncate with an ellipsis when space is tight,
and show the provider logo inline before the model name. Tighten the footer
action buttons (sessions / attach / auto-accept) so they sit close together,
with a small left inset on the group. In the mobile model selection overlay,
make the thinking-variant control text-only with a chevron, vertically center
the variant and favorite controls in each row, and place the provider logo
inline with the model name.

packages/ui/src/components/chat/ChatInput.tsx

@@ -4514,7 +4514,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
                         {isMobile ? (
                             <>
                                 <div className="flex w-full items-center justify-between gap-x-1.5">
-                                    <div className="flex items-center gap-x-1.5">
+                                    <div className="composer-mobile-actions flex items-center gap-x-2 pl-1">
                                         <MobileSessionPanelTrigger
                                             footerIconButtonClass={footerIconButtonClass}
                                             iconSizeClass={iconSizeClass}
@@ -4539,7 +4539,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
                                         />
                                     </div>
                                     <div className="flex items-center min-w-0 gap-x-1 justify-end">
-                                        <div className="flex items-center gap-x-1 min-w-0 max-w-[60vw] flex-shrink">
+                                        <div className="flex items-center gap-x-2 min-w-0 max-w-[60vw] flex-shrink">
                                             <MemoMobileModelButton onOpenModel={() => handleOpenMobilePanel('model')} className="min-w-0 flex-shrink" />
                                             <MemoMobileAgentButton
                                                 onOpenAgentPanel={handleOpenAgentPanel}

packages/ui/src/components/chat/MobileAgentButton.tsx

@@ -73,8 +73,8 @@ export const MobileAgentButton: React.FC<MobileAgentButtonProps> = ({ onCycleAge
             onPointerLeave={handlePointerLeave}
             onContextMenu={(e) => e.preventDefault()}
             className={cn(
-                'inline-flex min-w-0 items-center select-none',
+                'inline-flex min-w-0 items-stretch select-none',
-                'rounded-lg border border-border/50 px-1.5',
+                'rounded-lg',
                 'typography-micro font-medium',
                 'focus:outline-none hover:bg-[var(--interactive-hover)]',
                 'touch-none',
@@ -88,7 +88,9 @@ export const MobileAgentButton: React.FC<MobileAgentButtonProps> = ({ onCycleAge
             }}
             title={agentLabel}
         >
-            <span className="truncate">{agentLabel}</span>
+            <span className="flex h-full w-full min-w-0 items-center">
+                <span className="truncate">{agentLabel}</span>
+            </span>
         </button>
     );
 };

packages/ui/src/components/chat/MobileModelButton.tsx

@@ -2,6 +2,7 @@ import React from 'react';
 import { cn } from '@/lib/utils';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { getModelDisplayName } from './mobileControlsUtils';
+import { ProviderLogo } from '@/components/ui/ProviderLogo';
 import { useI18n } from '@/lib/i18n';
 
 interface MobileModelButtonProps {
@@ -12,6 +13,7 @@ interface MobileModelButtonProps {
 export const MobileModelButton: React.FC<MobileModelButtonProps> = ({ onOpenModel, className }) => {
     const { t } = useI18n();
     const currentModelId = useConfigStore((state) => state.currentModelId);
+    const currentProviderId = useConfigStore((state) => state.currentProviderId);
     const getCurrentProvider = useConfigStore((state) => state.getCurrentProvider);
     const currentProvider = getCurrentProvider();
     const modelLabel = getModelDisplayName(currentProvider, currentModelId, t('chat.modelControls.selectModel'));
@@ -21,8 +23,8 @@ export const MobileModelButton: React.FC<MobileModelButtonProps> = ({ onOpenMode
             type="button"
             onClick={onOpenModel}
             className={cn(
-                'inline-flex min-w-0 items-center justify-center',
+                'inline-flex min-w-0 items-stretch',
-                'rounded-lg border border-border/50 px-1.5',
+                'rounded-lg',
                 'typography-micro font-medium text-foreground/80',
                 'focus:outline-none hover:bg-[var(--interactive-hover)]',
                 className
@@ -30,8 +32,11 @@ export const MobileModelButton: React.FC<MobileModelButtonProps> = ({ onOpenMode
             style={{ height: '26px', maxHeight: '26px', minHeight: '26px' }}
             title={modelLabel}
         >
-            <span className="min-w-0 max-w-full overflow-x-auto whitespace-nowrap scrollbar-hidden">
+            <span className="flex h-full w-full min-w-0 items-center gap-1">
-                {modelLabel}
+                {currentProviderId ? (
+                    <ProviderLogo providerId={currentProviderId} className="size-4 flex-shrink-0" />
+                ) : null}
+                <span className="truncate">{modelLabel}</span>
             </span>
         </button>
     );

packages/ui/src/components/chat/ModelControls.tsx

@@ -1671,7 +1671,7 @@ export const ModelControls: React.FC<ModelControlsProps> = ({
                         isSelected && 'bg-interactive-selection/15 text-interactive-selection-foreground'
                     )}
                 >
-                    <div className="flex items-start gap-2 px-2 py-1.5">
+                    <div className="flex items-center gap-2 px-2 py-1.5">
                         <button
                             type="button"
                             onClick={() => handleMobileModelApply(providerId, modelId, resolvedVariant)}
@@ -1680,15 +1680,15 @@ export const ModelControls: React.FC<ModelControlsProps> = ({
                                 'focus:outline-none focus-visible:ring-1 focus-visible:ring-primary rounded-lg'
                             )}
                         >
-                            {showProviderLogo ? (
-                                <ProviderLogo providerId={providerId} className="mt-0.5 size-3.5 flex-shrink-0" />
-                            ) : null}
                             <div className="flex min-w-0 flex-1 flex-col gap-0.5">
-                                <div className="flex min-w-0 items-start gap-2">
+                                <div className="flex min-w-0 items-center gap-1.5">
+                                    {showProviderLogo ? (
+                                        <ProviderLogo providerId={providerId} className="size-3.5 flex-shrink-0" />
+                                    ) : null}
                                     <span className="typography-meta font-medium text-foreground truncate">
                                         {getModelDisplayName(model)}
                                     </span>
-                                    {isSelected ? <Icon name="check" className="mt-0.5 size-4 flex-shrink-0 text-primary" /> : null}
+                                    {isSelected ? <Icon name="check" className="size-4 flex-shrink-0 text-primary" /> : null}
                                 </div>
                                 {contextText || indicatorIcons.length > 0 ? (
                                     <div className="flex min-w-0 items-center gap-1.5 overflow-hidden typography-micro text-muted-foreground">
@@ -1722,7 +1722,7 @@ export const ModelControls: React.FC<ModelControlsProps> = ({
                             <button
                                 type="button"
                                 onClick={() => setExpandedMobileModelKey((prev) => prev === rowKey ? null : rowKey)}
-                                className="flex items-center gap-1 rounded-lg border border-border/40 px-2 py-1 typography-micro font-medium text-muted-foreground hover:bg-interactive-hover/50 flex-shrink-0"
+                                className="flex items-center gap-0.5 typography-micro font-medium text-muted-foreground hover:text-foreground flex-shrink-0"
                                 aria-expanded={isExpanded}
                                 aria-label={isExpanded ? t('chat.modelControls.hideThinkingModes') : t('chat.modelControls.showThinkingModes')}
                             >
@@ -1730,7 +1730,7 @@ export const ModelControls: React.FC<ModelControlsProps> = ({
                                 {isExpanded ? <Icon name="arrow-down-s" className="size-3.5" /> : <Icon name="arrow-right-s" className="size-3.5" />}
                             </button>
                         ) : null}
-                        <div className="flex flex-shrink-0 items-start gap-1.5">
+                        <div className="flex flex-shrink-0 items-center gap-1.5">
                             <button
                                 type="button"
                                 onClick={(event) => {

packages/ui/src/styles/mobile.css

@@ -85,6 +85,16 @@
     min-width: 36px;
   }
 
+  /* Composer footer action buttons (sessions / attach / auto-accept): hug the
+     icon so the group stays tight. The container only renders in the mobile
+     JSX, so no pointer/runtime gating is needed; !important overrides both the
+     w-8 utility and the global mobile touch-target min-width regardless of
+     cascade layer or specificity. */
+  .composer-mobile-actions button {
+    width: 1.5rem !important;
+    min-width: 0 !important;
+  }
+
   /* Improve input field touch targets */
   :root.mobile-pointer:not(.desktop-runtime) input,
   :root.mobile-pointer:not(.desktop-runtime) textarea,