enable simple chat

frontend/src/styles.css

@@ -65,6 +65,12 @@ button:disabled {
   gap: 8px;
 }
 
+.agent-item-row {
+  display: grid;
+  gap: 6px;
+  grid-template-columns: 1fr auto;
+}
+
 .agent-item {
   align-items: flex-start;
   display: flex;
@@ -109,6 +115,11 @@ button:disabled {
   color: #5f6f82;
 }
 
+.agent-chat-button {
+  align-self: stretch;
+  min-width: 64px;
+}
+
 .content {
   padding: 20px;
 }
@@ -535,3 +546,85 @@ button:disabled {
   margin: 6px 0;
 }
 
+.chat-modal-overlay {
+  align-items: center;
+  background: rgba(16, 24, 40, 0.45);
+  display: flex;
+  inset: 0;
+  justify-content: center;
+  position: fixed;
+  z-index: 20;
+}
+
+.chat-modal {
+  background: #fff;
+  border: 1px solid #d7e6f6;
+  border-radius: 12px;
+  display: grid;
+  gap: 10px;
+  max-height: 86vh;
+  max-width: 820px;
+  padding: 12px;
+  width: min(92vw, 820px);
+}
+
+.chat-modal-header {
+  align-items: center;
+  border-bottom: 1px solid #dbe2ea;
+  display: flex;
+  justify-content: space-between;
+  padding-bottom: 8px;
+}
+
+.chat-modal-header small {
+  color: #687788;
+  display: block;
+  margin-top: 2px;
+}
+
+.chat-modal-messages {
+  background: #f8fbff;
+  border: 1px solid #d7e6f6;
+  border-radius: 10px;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  max-height: 56vh;
+  overflow-y: auto;
+  padding: 10px;
+}
+
+.chat-modal-message {
+  background: #fff;
+  border: 1px solid #dbe2ea;
+  border-radius: 8px;
+  padding: 8px;
+}
+
+.chat-modal-message.user {
+  border-left: 3px solid #4d7ef3;
+}
+
+.chat-modal-message.assistant {
+  border-left: 3px solid #26a269;
+}
+
+.chat-modal-message p {
+  margin: 6px 0 0 0;
+  white-space: pre-wrap;
+}
+
+.chat-modal-input {
+  display: grid;
+  gap: 8px;
+  grid-template-columns: 1fr auto;
+}
+
+.chat-modal-input textarea {
+  border: 1px solid #c9d4e2;
+  border-radius: 8px;
+  font-size: 14px;
+  padding: 8px;
+  resize: vertical;
+}
+