fix(auth-files): polish selection UI and animate batch action bar

src/components/config/DiffModal.module.scss

@@ -5,6 +5,7 @@
   :global(.modal-body) {
     padding: $spacing-md $spacing-lg;
     max-height: none;
+    overflow: hidden;
   }
 }
 
@@ -39,17 +40,17 @@
 
   :global(.cm-mergeView) {
     height: 100%;
+    overflow: auto !important;
+    -webkit-overflow-scrolling: touch;
     background: var(--bg-primary);
   }
 
-  :global(.cm-mergeViewEditors),
-  :global(.cm-mergeViewEditor),
-  :global(.cm-editor) {
-    height: 100%;
+  :global(.cm-mergeViewEditors) {
+    min-height: 100%;
   }
 
-  :global(.cm-scroller) {
-    overflow: auto;
+  :global(.cm-mergeViewEditor) {
+    height: 100%;
   }
 
   :global(.cm-gutters) {

src/features/authFiles/components/AuthFileCard.tsx

@@ -2,7 +2,7 @@ import { useTranslation } from 'react-i18next';
 import { Button } from '@/components/ui/Button';
 import { LoadingSpinner } from '@/components/ui/LoadingSpinner';
 import { ToggleSwitch } from '@/components/ui/ToggleSwitch';
-import { IconBot, IconCode, IconDownload, IconInfo, IconTrash2 } from '@/components/ui/icons';
+import { IconBot, IconCheck, IconCode, IconDownload, IconInfo, IconTrash2 } from '@/components/ui/icons';
 import { ProviderStatusBar } from '@/components/providers/ProviderStatusBar';
 import type { AuthFileItem } from '@/types';
 import { resolveAuthProvider } from '@/utils/quota';
@@ -102,13 +102,16 @@ export function AuthFileCard(props: AuthFileCardProps) {
         <div className={styles.fileCardMain}>
           <div className={styles.cardHeader}>
             {!isRuntimeOnly && (
-              <input
-                type="checkbox"
-                className={styles.selectionCheckbox}
-                checked={selected}
-                onChange={() => onToggleSelect(file.name)}
-                aria-label={t('auth_files.batch_select_all')}
-              />
+              <button
+                type="button"
+                className={`${styles.selectionToggle} ${selected ? styles.selectionToggleActive : ''}`}
+                onClick={() => onToggleSelect(file.name)}
+                aria-label={selected ? t('auth_files.batch_deselect') : t('auth_files.batch_select_all')}
+                aria-pressed={selected}
+                title={selected ? t('auth_files.batch_deselect') : t('auth_files.batch_select_all')}
+              >
+                {selected && <IconCheck size={12} />}
+              </button>
             )}
             <span
               className={styles.typeBadge}

src/pages/AuthFilesPage.module.scss

@@ -500,7 +500,7 @@
 
 .fileCardSelected {
   border-color: var(--primary-color);
-  box-shadow: 0 0 0 1px var(--primary-color);
+  box-shadow: 0 0 0 1px color-mix(in srgb, var(--primary-color) 70%, transparent);
 
   &:hover {
     border-color: var(--primary-color);
@@ -538,13 +538,43 @@
   min-height: 28px;
 }
 
-.selectionCheckbox {
-  width: 16px;
-  height: 16px;
+.selectionToggle {
+  width: 22px;
+  height: 22px;
   margin: 0;
   flex-shrink: 0;
-  accent-color: var(--primary-color);
+  border-radius: 7px;
+  border: 1px solid var(--border-color);
+  background: color-mix(in srgb, var(--bg-secondary) 92%, transparent);
+  color: var(--primary-contrast, #fff);
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
   cursor: pointer;
+  transition:
+    border-color $transition-fast,
+    background-color $transition-fast,
+    box-shadow $transition-fast,
+    transform $transition-fast;
+
+  &:hover {
+    border-color: var(--primary-color);
+    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 16%, transparent);
+  }
+
+  &:active {
+    transform: scale(0.95);
+  }
+}
+
+.selectionToggleActive {
+  border-color: var(--primary-color);
+  background: var(--primary-color);
+}
+
+.selectionToggleActive svg {
+  display: block;
+  stroke-width: 2.4;
 }
 
 .typeBadge {
@@ -904,6 +934,7 @@
   transform: translateX(-50%);
   z-index: 50;
   width: min(960px, calc(100vw - 24px));
+  will-change: transform, opacity;
 }
 
 .batchActionBar {

src/pages/AuthFilesPage.tsx

@@ -2,6 +2,7 @@ import { useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState, typ
 import { createPortal } from 'react-dom';
 import { useTranslation } from 'react-i18next';
 import { useNavigate } from 'react-router-dom';
+import gsap from 'gsap';
 import { useInterval } from '@/hooks/useInterval';
 import { useHeaderRefresh } from '@/hooks/useHeaderRefresh';
 import { usePageTransitionLayer } from '@/components/common/PageTransitionLayer';
@@ -57,6 +58,7 @@ export function AuthFilesPage() {
   const [selectedFile, setSelectedFile] = useState<AuthFileItem | null>(null);
   const [viewMode, setViewMode] = useState<'diagram' | 'list'>('list');
   const floatingBatchActionsRef = useRef<HTMLDivElement>(null);
+  const previousSelectionCountRef = useRef(0);
 
   const { keyStats, usageDetails, loadKeyStats } = useAuthFilesStats();
   const {
@@ -331,6 +333,23 @@ export function AuthFilesPage() {
     };
   }, [selectionCount]);
 
+  useLayoutEffect(() => {
+    const currentCount = selectionCount;
+    const previousCount = previousSelectionCountRef.current;
+    const actionsEl = floatingBatchActionsRef.current;
+
+    if (currentCount > 0 && previousCount === 0 && actionsEl) {
+      gsap.killTweensOf(actionsEl);
+      gsap.fromTo(
+        actionsEl,
+        { y: 56, autoAlpha: 0 },
+        { y: 0, autoAlpha: 1, duration: 0.28, ease: 'power3.out' }
+      );
+    }
+
+    previousSelectionCountRef.current = currentCount;
+  }, [selectionCount]);
+
   const renderFilterTags = () => (
     <div className={styles.filterTags}>
       {existingTypes.map((type) => {