feat(kimi-web): consistent rules for the right-side detail layer

The transient detail panels (thinking, compaction summary, subagent
detail, mobile file/media preview) now share one set of rules:
- the aside is a labelled role=complementary region (aria-hidden when
  collapsed),
- Escape closes whichever panel is open — handled in App on the capture
  phase so it takes precedence over the conversation's "Esc interrupts a
  run" handler instead of firing both,
- every close button has an aria-label (not just a title) and a
  focus-visible ring; thinking/subagent close targets bumped to 28x28,
- FilePreview toolbar buttons get focus-visible rings too.

apps/kimi-web/src/App.vue

@@ -1,6 +1,6 @@
 <!-- apps/kimi-web/src/App.vue -->
 <script setup lang="ts">
-import { computed, nextTick, onMounted, provide, ref, watch } from 'vue';
+import { computed, nextTick, onMounted, onUnmounted, provide, ref, watch } from 'vue';
 import { useI18n } from 'vue-i18n';
 import Sidebar from './components/Sidebar.vue';
 import ResizeHandle from './components/ResizeHandle.vue';
@@ -75,8 +75,33 @@ function openOnboarding(): void {
 
 onMounted(() => {
   void client.load();
+  // Capture-phase so Escape closes the side detail layer BEFORE the
+  // conversation pane's bubble-phase handler interrupts a running prompt.
+  document.addEventListener('keydown', onGlobalKeydown, true);
 });
 
+onUnmounted(() => {
+  document.removeEventListener('keydown', onGlobalKeydown, true);
+});
+
+// Escape closes whichever transient right-side detail panel is open (thinking,
+// compaction summary, subagent detail, or the mobile file/media preview).
+function closeOpenSidePanel(): boolean {
+  if (thinkingVisible.value) { closeThinkingPanel(); return true; }
+  if (compactionPanelVisible.value) { closeCompactionPanel(); return true; }
+  if (agentPanelVisible.value) { closeAgentPanel(); return true; }
+  if (sidePreviewVisible.value) { closeFilePreview(); return true; }
+  return false;
+}
+
+function onGlobalKeydown(e: KeyboardEvent): void {
+  if (e.key !== 'Escape') return;
+  if (closeOpenSidePanel()) {
+    e.stopPropagation();
+    e.preventDefault();
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Layout: resizable session column. ResizeHandle owns the column width (with
 // localStorage persistence); we mirror it here to drive the App grid.
@@ -849,6 +874,9 @@ function openPr(url: string): void {
       v-if="!isMobile || sidePanelVisible"
       class="global-preview"
       :class="{ open: sidePanelVisible, mobile: isMobile, 'no-anim': panelDragging }"
+      role="complementary"
+      :aria-label="t('layout.detailPanelAria')"
+      :aria-hidden="!sidePanelVisible"
     >
       <ThinkingPanel
         v-if="thinkingVisible"

apps/kimi-web/src/components/AgentDetailPanel.vue

@@ -55,7 +55,7 @@ watch(
       <span class="ap-title">{{ t('common.preview') }}</span>
       <span class="ap-sub">{{ member.name }}</span>
       <span class="ap-phase" :class="`phase-${member.phase}`">{{ phaseLabel(member.phase) }}</span>
-      <button type="button" class="ap-close" :title="t('thinking.close')" @click="emit('close')">
+      <button type="button" class="ap-close" :title="t('thinking.close')" :aria-label="t('thinking.close')" @click="emit('close')">
         <svg viewBox="0 0 12 12" width="11" height="11" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" aria-hidden="true"><line x1="2" y1="2" x2="10" y2="10"/><line x1="10" y1="2" x2="2" y2="10"/></svg>
       </button>
     </div>
@@ -134,8 +134,8 @@ watch(
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  width: 24px;
-  height: 24px;
+  width: 28px;
+  height: 28px;
   background: none;
   border: none;
   border-radius: 5px;
@@ -146,6 +146,10 @@ watch(
   background: var(--hover);
   color: var(--ink);
 }
+.ap-close:focus-visible {
+  outline: 2px solid var(--blue);
+  outline-offset: -2px;
+}
 
 .ap-body {
   flex: 1;

apps/kimi-web/src/components/FilePreview.vue

@@ -439,7 +439,7 @@ function truncatePath(path: string, maxLen = 55): string {
           <svg v-if="!copied" viewBox="0 0 16 16" width="13" height="13" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="3" y="3" width="9" height="9" rx="1.5"/><path d="M6 1h7a1 1 0 0 1 1 1v7"/></svg>
           <svg v-else viewBox="0 0 16 16" width="13" height="13" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><polyline points="3,8 6.5,11.5 13,5"/></svg>
         </button>
-        <button v-if="closable" type="button" class="fp-close" :title="t('filePreview.close')" @click="emit('close')">
+        <button v-if="closable" type="button" class="fp-close" :title="t('filePreview.close')" :aria-label="t('filePreview.close')" @click="emit('close')">
           ×
         </button>
       </div>
@@ -685,6 +685,13 @@ function truncatePath(path: string, maxLen = 55): string {
   color: var(--blue2);
   border-color: var(--bd);
 }
+.fp-action:focus-visible,
+.fp-icon-btn:focus-visible,
+.fp-close:focus-visible,
+.fp-seg-btn:focus-visible {
+  outline: 2px solid var(--blue);
+  outline-offset: -1px;
+}
 .fp-action.copied {
   color: var(--ok);
   border-color: color-mix(in srgb, var(--ok) 35%, var(--bg));

apps/kimi-web/src/components/ThinkingPanel.vue

@@ -41,7 +41,7 @@ watch(
     <div class="tp-header">
       <span class="tp-title">{{ t('common.preview') }}</span>
       <span class="tp-sub">{{ subtitle ?? t('thinking.panelTitle') }}</span>
-      <button type="button" class="tp-close" :title="t('thinking.close')" @click="emit('close')">
+      <button type="button" class="tp-close" :title="t('thinking.close')" :aria-label="t('thinking.close')" @click="emit('close')">
         <svg viewBox="0 0 12 12" width="11" height="11" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" aria-hidden="true"><line x1="2" y1="2" x2="10" y2="10"/><line x1="10" y1="2" x2="2" y2="10"/></svg>
       </button>
     </div>
@@ -95,8 +95,8 @@ watch(
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  width: 24px;
-  height: 24px;
+  width: 28px;
+  height: 28px;
   background: none;
   border: none;
   border-radius: 5px;
@@ -107,6 +107,10 @@ watch(
   background: var(--hover);
   color: var(--ink);
 }
+.tp-close:focus-visible {
+  outline: 2px solid var(--blue);
+  outline-offset: -2px;
+}
 
 .tp-body {
   flex: 1;

apps/kimi-web/src/i18n/locales/en/layout.ts

@@ -1,4 +1,5 @@
 export default {
   resizeHandleAria: 'Resize sidebar width',
   resizePreviewAria: 'Resize preview panel width',
+  detailPanelAria: 'Detail panel',
 } as const;

apps/kimi-web/src/i18n/locales/zh/layout.ts

@@ -1,4 +1,5 @@
 export default {
   resizeHandleAria: '调整侧栏宽度',
   resizePreviewAria: '调整预览面板宽度',
+  detailPanelAria: '详情面板',
 };