Polish server and session management UI

app/src/main/java/com/neatstudio/tmuxandroid/ConversationMessage.java

@@ -0,0 +1,85 @@
+package com.neatstudio.tmuxandroid;
+
+import org.json.JSONObject;
+
+final class ConversationMessage {
+    final String messageId;
+    final String sessionName;
+    final String role;
+    final String contentType;
+    final String content;
+    final String status;
+    final String toolName;
+    final String parentMessageId;
+    final String createdAt;
+    final boolean local;
+
+    ConversationMessage(
+            String messageId,
+            String sessionName,
+            String role,
+            String contentType,
+            String content,
+            String status,
+            String toolName,
+            String parentMessageId,
+            String createdAt,
+            boolean local
+    ) {
+        this.messageId = messageId;
+        this.sessionName = sessionName;
+        this.role = role;
+        this.contentType = contentType;
+        this.content = content;
+        this.status = status;
+        this.toolName = toolName;
+        this.parentMessageId = parentMessageId;
+        this.createdAt = createdAt;
+        this.local = local;
+    }
+
+    static ConversationMessage fromJson(JSONObject object) {
+        return new ConversationMessage(
+                value(object, "messageId", object.optString("id", "")),
+                object.optString("sessionName", ""),
+                object.optString("role", "assistant"),
+                object.optString("contentType", "text"),
+                object.optString("content", ""),
+                object.optString("status", "complete"),
+                object.optString("toolName", ""),
+                value(object, "parentMessageId", ""),
+                object.optString("createdAt", ""),
+                false
+        );
+    }
+
+    static ConversationMessage localUser(String sessionName, String content) {
+        long now = System.currentTimeMillis();
+        return new ConversationMessage(
+                "local-" + now,
+                sessionName,
+                "user",
+                "text",
+                content,
+                "sending",
+                "",
+                "",
+                "~" + now,
+                true
+        );
+    }
+
+    boolean isTool() {
+        return "tool".equals(role)
+                || "tool".equals(contentType)
+                || "command".equals(contentType)
+                || "code".equals(contentType);
+    }
+
+    private static String value(JSONObject object, String key, String fallback) {
+        if (!object.has(key) || object.isNull(key)) {
+            return fallback;
+        }
+        return object.optString(key, fallback);
+    }
+}

app/src/main/java/com/neatstudio/tmuxandroid/TerminalScreenBuffer.java

@@ -130,6 +130,20 @@ final class TerminalScreenBuffer {
         return output;
     }
 
+    String renderTail(int maxRows) {
+        List<String> visible = new ArrayList<>();
+        for (int row = rows - 1; row >= 0 && visible.size() < maxRows; row--) {
+            String text = rowText(row).trim();
+            if (!text.isEmpty()) {
+                visible.add(0, text);
+            }
+        }
+        if (visible.isEmpty()) {
+            return "Waiting for terminal output";
+        }
+        return String.join("\n", visible);
+    }
+
     CharSequence renderFocused(Set<String> expandedBlocks, FocusToggle toggle) {
         SpannableStringBuilder output = new SpannableStringBuilder();
         List<String> hiddenRows = new ArrayList<>();