Add session activity dock and auto naming

src/server/sessions/sessionNameGenerator.ts

@@ -0,0 +1,66 @@
+import { getApiProvider, type Api, type AssistantMessage, type Model } from "@earendil-works/pi-ai";
+import type { ModelRegistry } from "@earendil-works/pi-coding-agent";
+
+const SESSION_NAME_TIMEOUT_MS = 10_000;
+const SESSION_NAME_MAX_INPUT_CHARS = 4_000;
+const SESSION_NAME_MAX_LENGTH = 60;
+
+export async function generateShortSessionName<TApi extends Api>(modelRegistry: ModelRegistry, model: Model<TApi>, firstMessage: string): Promise<string | undefined> {
+  const provider = getApiProvider(model.api);
+  if (provider === undefined) return undefined;
+
+  const auth = await modelRegistry.getApiKeyAndHeaders(model);
+  if (!auth.ok) return undefined;
+
+  const stream = provider.streamSimple(
+    model,
+    {
+      systemPrompt: "Generate a concise title for a coding-agent chat session. Return only the title, with no quotes or punctuation wrapper.",
+      messages: [{
+        role: "user",
+        content: `Create a 2-6 word title for this request:\n\n${truncateInput(firstMessage)}`,
+        timestamp: Date.now(),
+      }],
+    },
+    {
+      temperature: 0.2,
+      maxTokens: 24,
+      reasoning: "minimal",
+      signal: AbortSignal.timeout(SESSION_NAME_TIMEOUT_MS),
+      ...(auth.apiKey === undefined ? {} : { apiKey: auth.apiKey }),
+      ...(auth.headers === undefined ? {} : { headers: auth.headers }),
+    },
+  );
+
+  let streamedText = "";
+  let finalMessage: AssistantMessage | undefined;
+  for await (const event of stream) {
+    if (event.type === "text_delta") streamedText += event.delta;
+    if (event.type === "done") finalMessage = event.message;
+    if (event.type === "error") return undefined;
+  }
+
+  return cleanSessionName(finalMessage === undefined ? streamedText : textFromAssistant(finalMessage));
+}
+
+export function cleanSessionName(value: string): string | undefined {
+  const title = (value.split("\n", 1)[0] ?? "")
+    .replace(/^\s*["'`]+|["'`.]+\s*$/g, "")
+    .replace(/^(title|session title)\s*:\s*/i, "")
+    .replace(/\s+/g, " ")
+    .trim()
+    .slice(0, SESSION_NAME_MAX_LENGTH)
+    .trim();
+  return title === "" ? undefined : title;
+}
+
+function textFromAssistant(message: AssistantMessage): string {
+  return message.content
+    .filter((part) => part.type === "text")
+    .map((part) => part.text)
+    .join("");
+}
+
+function truncateInput(value: string): string {
+  return value.length <= SESSION_NAME_MAX_INPUT_CHARS ? value : `${value.slice(0, SESSION_NAME_MAX_INPUT_CHARS)}…`;
+}