feat: snip a region into chat, and make links clickable (#14)

src/lib/thread.ts

@@ -43,6 +43,8 @@ export function buildThread(turns: ChatTurn[], live: LiveState): ThreadMessage[]
       // Only while there is nothing to read yet. Once tokens land, the
       // placeholder it feeds is gone anyway.
       status: isLive && text.length === 0 ? live.status : undefined,
+      // Only a question carries attachments, so the answer never has one.
+      attachments: [],
     });
 
     messages.push({
@@ -53,6 +55,7 @@ export function buildThread(turns: ChatTurn[], live: LiveState): ThreadMessage[]
       isStreaming: false,
       thinking: "",
       toolCalls: [],
+      attachments: turn.attachments,
     });
   }