resolve /chat/<id> by scanning project groups and make session rows real links

deep-linking or refreshing /chat/<id> only has the id, so add loadClaudeSessionById
to scan every project group for the transcript and return its real cwd. the session
list page resolves on load from that, setting the cwd picker and resuming. session
rows are now <Link to=/chat/<id>> so clicking updates the url and flows through the
same resolve path.

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

src/servers/api/chat/chat.ts

@@ -6,6 +6,7 @@ import {
   listClaudePwds,
   listClaudeSessions,
   loadClaudeSession,
+  loadClaudeSessionById,
   deleteClaudeSession,
   renameClaudeSession,
 } from './claude-sessions';
@@ -50,7 +51,11 @@ chatRouter.get('/sessions/:id', async (ctx) => {
   const email = ctx.get('user').email;
   const id = ctx.req.param('id');
   const cwd = cwdOf(ctx, email);
-  const detail = isOpenCodeSessionId(id) ? await loadOpenCodeSession(id) : loadClaudeSession(email, cwd, id);
+  // Fall back to a by-id scan when the (default) cwd doesn't hold it — a fresh /chat/<id> deep-link/refresh
+  // doesn't know the session's cwd. The returned detail carries the real cwd for the client to scope the UI.
+  const detail = isOpenCodeSessionId(id)
+    ? await loadOpenCodeSession(id)
+    : (loadClaudeSession(email, cwd, id) ?? loadClaudeSessionById(email, id));
   if (!detail) return ctx.text('Not found', 404);
   return ctx.json(detail);
 });