feat: initial conversational flow (#37)

* chore: only set visibility for container particles

* create reusable controls indicator for reply or new

* compress the size of top bar

* refactor: restructure state, routing, and more

* introduce stream compose flow

* feat: compose new stream full flow

* implement stream player

* fix: prevent redirect for signed object urls

* fix: implement stream playback cleaner structure

* refactor: layout file name

* feat: show stream name in breadcrumbs

* chore: tweak padding

* chore: adjust position of audio bars

* feat: show latest particle preview in stream list

* fix: remove console log

* refactor: reorder classes

* fix: avoid passing in updated_at to firestore particle

* refactor: extract properties for container particles to flat fields in firestore

* make the stream previews look alive

* feat: show audio bars during audio clip playback

* feat: order streams by last child creation

* feat: playback where I left off

* chore: remove unused store

* fix: recording mode not using shared state

* chore: clean unused variable

* remove unused imports

* fix: improve controls indicator immersion

* feat: show playback progress in bar & auto-play text

* feat: auto-exit stream on playback completion

* fix: jittery media playback progress

* fix: navigate during state change is invalid with react router

* fix: buggy exit progress when changing clips

* feat: add app icon

* update package.json info

* feat: only show streams visible to me

* feat: show seen indicator on particles

* fix: prevent unnecessary effects

* fix: play new particle after playback is ended

* use contols indicator for exit timer

js/src/features/network-root.tsx

@@ -0,0 +1,22 @@
+import { useParams } from "react-router-dom";
+import { particlePath } from "@/lib/particle-path";
+import { ParticleListView } from "@/features/particles/particle-list-view";
+import ControlsIndicator from "@/features/compose/controls-indicator";
+import { ComposeOverlay } from "./compose/compose-overlay";
+
+/**
+ * Route-level component for /:networkId (index).
+ * Shows root-level particles for the selected network.
+ */
+export default function NetworkRoot() {
+  const { networkId } = useParams();
+  const path = particlePath(networkId!, []);
+
+  return (
+    <div className="flex flex-col h-full relative">
+      <ParticleListView path={path} />
+      <ComposeOverlay networkId={networkId!} />
+      <ControlsIndicator type={"new"} />
+    </div>
+  );
+}