feat(canvas): 云端 Agent 交互 - 展示错误动作并支持连接器与提示词预填

web/src/components/canvas/canvas-cloud-agent-connectors.css

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+/* Agent 连接器样式 - 极简紧凑版：高度压缩，图标更小，左右紧密排列 */
+
+.agent-connectors {
+    display: flex;
+    align-items: center;
+    gap: var(--space-1-half);
+    padding: var(--space-1-half) var(--space-3) var(--space-2-half);
+    color: var(--agent-caption);
+}
+
+.agent-connectors-label {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+    font-size: 10.5px;
+    font-weight: 500;
+    flex-shrink: 0;
+    opacity: 0.7;
+}
+
+.agent-connectors-label > svg {
+    width: 13px;
+    height: 13px;
+}
+
+.agent-connectors-list {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+    flex: 1;
+    min-width: 0;
+}
+
+.agent-connector-item {
+    width: 24px;
+    height: 24px;
+    padding: 0;
+    border: 0;
+    background: transparent;
+    display: grid;
+    place-items: center;
+    cursor: pointer;
+    flex-shrink: 0;
+    transition: transform 0.16s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.agent-connector-item > svg {
+    width: 20px;
+    height: 20px;
+}
+
+.agent-connector-item:hover {
+    transform: translateY(-1px) scale(1.08);
+}
+
+.agent-connector-item:active {
+    transform: scale(0.96);
+}
+
+.agent-connectors-close {
+    width: 22px;
+    height: 22px;
+    padding: 0;
+    border: 0;
+    border-radius: 999px;
+    background: transparent;
+    color: var(--agent-caption);
+    display: grid;
+    place-items: center;
+    cursor: pointer;
+    flex-shrink: 0;
+    transition: all 0.14s ease;
+    opacity: 0.6;
+}
+
+.agent-connectors-close > svg {
+    width: 12px;
+    height: 12px;
+}
+
+.agent-connectors-close:hover {
+    opacity: 1;
+    background: color-mix(in srgb, var(--agent-ink) 6%, transparent);
+}
+
+.agent-connectors-close:active {
+    transform: scale(0.92);
+}
+
+@media (prefers-reduced-motion: reduce) {
+    .agent-connector-item,
+    .agent-connector-item:hover,
+    .agent-connector-item:active {
+        transform: none;
+    }
+}