新增: L3 完整上下文面板(对话透明化)

- 底部工具区加上下文图标(i),点击展开面板
- 系统提示: 显示目标数/环境/压缩摘要条数
- 增强上下文: 显示 @项目 mentions 列表
- 点击外部/Escape 关闭,对齐已有下拉交互模式

src/components/ai/TopBar.vue

@@ -151,6 +151,42 @@
         </div>
       </div>
     </div>
+    <!-- L3 完整上下文 -->
+    <div v-if="contextInfo.goals.length || contextInfo.summaryCount > 0" class="ai-context-inline">
+      <span class="ai-context-inline-badge ai-tool-badge" @click="contextExpanded = !contextExpanded" title="查看 AI 上下文">
+        <svg width="9" height="9" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M12 16v-4"/><circle cx="12" cy="8" r="1" fill="currentColor"/></svg>
+      </span>
+      <div v-if="contextExpanded" class="ai-context-inline-list">
+        <!-- 系统提示 -->
+        <div class="ai-context-section">
+          <div class="ai-context-section-title">系统提示</div>
+          <div class="ai-context-section-body">
+            <div class="ai-context-row">
+              <span class="ai-context-label">目标({{ contextInfo.goals.length }})</span>
+              <span class="ai-context-value">{{ contextInfo.goals.join('; ') || '无' }}</span>
+            </div>
+            <div class="ai-context-row">
+              <span class="ai-context-label">环境</span>
+              <span class="ai-context-value">{{ contextInfo.osInfo }}</span>
+            </div>
+            <div class="ai-context-row">
+              <span class="ai-context-label">压缩摘要</span>
+              <span class="ai-context-value">{{ contextInfo.summaryCount }} 条</span>
+            </div>
+          </div>
+        </div>
+        <!-- 增强上下文 -->
+        <div class="ai-context-section">
+          <div class="ai-context-section-title">增强上下文</div>
+          <div class="ai-context-section-body">
+            <div class="ai-context-row">
+              <span class="ai-context-label">@项目</span>
+              <span class="ai-context-value">{{ contextInfo.projectNames || '无' }}</span>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
     </div>
   </div>
 
@@ -324,6 +360,9 @@ function onBottomToolsClickOutside(e: MouseEvent) {
   if (summaryExpanded.value && !goalsRef.value.contains(e.target as Node)) {
     summaryExpanded.value = false
   }
+  if (contextExpanded.value && !goalsRef.value.contains(e.target as Node)) {
+    contextExpanded.value = false
+  }
 }
 // ── 📄 上下文摘要(压缩/归档的系统消息) ──
 interface SummaryItem { id: string; text: string }
@@ -337,12 +376,44 @@ const summaryMsgs = computed<SummaryItem[]>(() => {
 })
 const summaryExpanded = ref(false)
 
+// ── L3 完整上下文 ──
+interface ContextInfo {
+  goals: string[]
+  summaryCount: number
+  osInfo: string
+  projectNames: string
+}
+const contextExpanded = ref(false)
+
+const contextInfo = computed<ContextInfo>(() => {
+  const convId = store.state.activeConversationId
+  const conv = convId ? store.state.conversations.find(c => c.id === convId) : undefined
+  // 从所有 user 消息中收集 mentionSpans(kind === 'project'),去重
+  const projectLabels = new Set<string>()
+  for (const m of store.state.messages) {
+    if (m.role === 'user' && m.mentionSpans?.length) {
+      for (const sp of m.mentionSpans) {
+        if (sp.kind === 'project' && sp.label) {
+          projectLabels.add(sp.label)
+        }
+      }
+    }
+  }
+  return {
+    goals: conv?.pinned_goals ?? [],
+    summaryCount: summaryMsgs.value.length,
+    osInfo: 'Windows 11 / PowerShell',
+    projectNames: Array.from(projectLabels).join(', ') || '无',
+  }
+})
+
 /** 按 Escape 关闭所有下拉 */
 function onBottomToolsKeydown(e: KeyboardEvent) {
   if (e.key === 'Escape') {
     goalsExpanded.value = false
     historyExpanded.value = false
     summaryExpanded.value = false
+    contextExpanded.value = false
   }
 }
 onMounted(() => {
@@ -718,6 +789,56 @@ onBeforeUnmount(() => {
   overflow: hidden;
 }
 
+/* ═══ L3 完整上下文(底部) ═══ */
+.ai-context-inline {
+  position: relative;
+  display: inline-flex;
+  align-items: center;
+}
+.ai-context-inline-list {
+  position: absolute;
+  left: auto; right: 0;
+  top: 100%;
+  z-index: 100;
+  min-width: 280px;
+  max-width: 420px;
+  background: var(--df-bg);
+  border: 0.5px solid var(--df-border);
+  border-radius: var(--df-radius-sm);
+  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
+  margin-top: 2px;
+}
+.ai-context-section {
+  padding: 6px 10px;
+  border-bottom: 0.5px solid var(--df-border);
+}
+.ai-context-section:last-child { border-bottom: none; }
+.ai-context-section-title {
+  font-size: 10px;
+  font-weight: 600;
+  color: var(--df-accent);
+  margin-bottom: 4px;
+}
+.ai-context-section-body {
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+}
+.ai-context-row {
+  display: flex;
+  gap: 6px;
+  font-size: 11px;
+}
+.ai-context-label {
+  flex-shrink: 0;
+  color: var(--df-text-dim);
+  min-width: 56px;
+}
+.ai-context-value {
+  color: var(--df-text-secondary);
+  word-break: break-all;
+}
+
 /* header 中间区:provider + 模型选择器并排 */
 .ai-header-center {
   display: flex;