make the stream previews look alive

js/src/features/particles/particle-list-view.tsx

@@ -1,7 +1,19 @@
 import { useMemo } from "react";
 import { useNavigate } from "react-router-dom";
-import { Radio } from "lucide-react";
+import {
+  Radio,
+  MessageSquare,
+  Video,
+  Mic,
+  Image,
+  FileText,
+  CircleCheck,
+  StickyNote,
+  type LucideIcon,
+} from "lucide-react";
+import { cn } from "@/lib/utils";
 import { useLiveParticleChildren, useLiveLatestChild } from "@/hooks/use-particle";
+import { useAuthStore } from "@/stores/auth-store";
 import {
   parseParticlePath,
   particlePath,
@@ -16,12 +28,39 @@ import { Progress } from "@/components/ui/progress";
 import { Small } from "@/components/ui/typography";
 import type { Particle, StreamProperties } from "@/api/types";
 
+function getParticleTypeIcon(particle: Particle): LucideIcon {
+  switch (particle.type) {
+    case "text":
+      return MessageSquare;
+    case "media": {
+      const mime = particle.properties.mime_type;
+      if (mime.startsWith("video/")) return Video;
+      if (mime.startsWith("audio/")) return Mic;
+      if (mime.startsWith("image/")) return Image;
+      return Video;
+    }
+    case "file":
+      return FileText;
+    case "quest":
+      return CircleCheck;
+    case "paper":
+      return StickyNote;
+    default:
+      return Radio;
+  }
+}
+
 function getMessagePreview(particle: Particle): string {
   switch (particle.type) {
     case "text":
       return particle.properties.content;
-    case "media":
-      return "Clip received";
+    case "media": {
+      const mime = particle.properties.mime_type;
+      if (mime.startsWith("video/")) return "Video clip";
+      if (mime.startsWith("audio/")) return "Voice note";
+      if (mime.startsWith("image/")) return "Photo";
+      return "Media";
+    }
     case "file":
       return particle.properties.filename;
     case "quest":
@@ -44,44 +83,115 @@ function StreamRow({
 }) {
   const streamPath = particlePath(networkId, [particle.id]);
   const { latestChild } = useLiveLatestChild(streamPath);
+  const user = useAuthStore((s) => s.user);
+  const userEmail = user?.email ?? "";
 
-  const initials = latestChild
-    ? getInitials(latestChild.created_by_email)
-    : particle.properties.name.slice(0, 2).toUpperCase();
+  const isDM =
+    particle.visible_to.length === 2 &&
+    particle.visible_to.every((v) => v.startsWith("human:"));
+
+  const initials = useMemo(() => {
+    if (isDM) {
+      const otherEntry = particle.visible_to.find(
+        (v) => v !== `human:${userEmail}`,
+      );
+      if (otherEntry) {
+        const otherEmail = otherEntry.replace("human:", "");
+        return getInitials(otherEmail);
+      }
+    }
+    return particle.properties.name.slice(0, 2).toUpperCase();
+  }, [isDM, particle.visible_to, particle.properties.name, userEmail]);
+
+  const isUnseen = useMemo(() => {
+    if (!latestChild) return false;
+    const latestChildTimestamp = latestChild.created_at.getTime();
+    const userPlaybackPosition =
+      particle.markers?.[userEmail]?.getTime() ?? 0;
+    return latestChildTimestamp > userPlaybackPosition;
+  }, [latestChild, particle.markers, userEmail]);
+
+  const senderPrefix = useMemo(() => {
+    if (!latestChild) return null;
+    const isCurrentUser = latestChild.created_by_email === userEmail;
+    if (isDM) {
+      return isCurrentUser ? "You: " : null;
+    }
+    // Group stream
+    if (isCurrentUser) return "You: ";
+    const emailPrefix = latestChild.created_by_email.split("@")[0];
+    const capitalized =
+      emailPrefix.charAt(0).toUpperCase() + emailPrefix.slice(1);
+    return `${capitalized}: `;
+  }, [latestChild, userEmail, isDM]);
 
   const subtitle = latestChild
     ? getMessagePreview(latestChild)
     : particle.properties.status;
 
+  const TypeIcon = latestChild ? getParticleTypeIcon(latestChild) : Radio;
+
   return (
     <button
       type="button"
       onClick={onClick}
       className="flex w-full items-center gap-3 px-4 py-3 text-left transition-colors hover:bg-accent"
     >
-      <Avatar>
+      <Avatar
+        className={cn(isUnseen && "ring-2 ring-primary")}
+      >
         <AvatarFallback className="bg-primary/10 text-primary font-medium">
           {initials}
         </AvatarFallback>
       </Avatar>
       <div className="min-w-0 flex-1">
         <div className="flex items-center justify-between gap-2">
-          <p className="truncate text-sm font-medium">
+          <p
+            className={cn(
+              "truncate text-sm",
+              isUnseen
+                ? "font-semibold text-foreground"
+                : "font-medium text-muted-foreground",
+            )}
+          >
             {particle.properties.name}
           </p>
           {latestChild && (
-            <Small className="text-muted-foreground shrink-0">
+            <Small
+              className={cn(
+                "shrink-0",
+                isUnseen ? "text-primary" : "text-muted-foreground",
+              )}
+            >
               {formatDistanceToNow(latestChild.created_at.toISOString())}
             </Small>
           )}
         </div>
-        <div className="text-muted-foreground flex items-center gap-1">
-          {!latestChild && <Radio className="size-3" />}
-          <Small className="text-muted-foreground truncate">
+        <div className="flex items-center gap-1">
+          <TypeIcon
+            className={cn(
+              "size-3.5 shrink-0",
+              isUnseen ? "text-foreground" : "text-muted-foreground",
+            )}
+          />
+          <Small
+            className={cn(
+              "truncate",
+              isUnseen
+                ? "text-foreground font-medium"
+                : "text-muted-foreground font-normal",
+            )}
+          >
+            {senderPrefix && (
+              <span className="text-muted-foreground">{senderPrefix}</span>
+            )}
             {subtitle}
           </Small>
         </div>
       </div>
+      {isUnseen && (
+        <span className="size-2 shrink-0 rounded-full bg-primary" />
+      )}
     </button>
   );
 }