fix(ui): companion rail loads current space on initial page load

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/app.js

@@ -35,6 +35,10 @@ async function renderView(ctx) {
   } else {
     state.view = null;
   }
+  // Notify subscribers (right rail) of the active Space. The state bus replays
+  // the last value on subscribe, so this covers both the initial route() call
+  // and every subsequent navigation with one path.
+  emit('space-active', state.spaceId);
 
   const main = document.getElementById('main');
   const loader = VIEWS[ctx.name] || VIEWS.home;

public/components/rightrail.js

@@ -3,7 +3,7 @@ import { el, mount, clear } from '../dom.js';
 import { api } from '../api.js';
 import { streamTurn } from '../sse.js';
 import { renderMarkdown } from '../markdown.js';
-import { state } from '../state.js';
+import { state, on } from '../state.js';
 
 const COLLAPSE_KEY = 'void_rail_collapsed';
 
@@ -118,17 +118,16 @@ export async function renderRightrail(root) {
     input.addEventListener('keydown', handler);
   }
 
-  // Initial render — state.spaceId may be null if route hasn't fired yet.
-  await initChat(state.spaceId);
-
-  // Re-init when navigation brings a new Space into focus.
-  let lastSpaceId = state.spaceId;
-  window.addEventListener('hashchange', async () => {
-    // Wait a tick so app.js's renderView can update state first.
-    await Promise.resolve();
-    if (state.spaceId !== lastSpaceId) {
-      lastSpaceId = state.spaceId;
-      await initChat(state.spaceId);
-    }
+  // Load (and re-load) the chat whenever the active Space changes. The state
+  // bus replays its last value on subscribe, so this fires for the initial
+  // route() call (covering hard loads to #/space/<id>) as well as every later
+  // navigation. We only re-init when the id actually changes so navigating
+  // within a Space (page/ref/etc.) doesn't wipe the conversation.
+  let lastSpaceId; let inited = false;
+  on('space-active', (spaceId) => {
+    if (inited && spaceId === lastSpaceId) return;
+    inited = true;
+    lastSpaceId = spaceId;
+    initChat(spaceId);
   });
 }