fix(story-mode): the rest of the PR review: lookups, polling, frame budget, linear links

From review round 7 (PR review):

- With no hook path (normal after a server restart), the transcript was
  looked up by conversation id only; it now also tries the Codeman id and
  a recovered session's `restored-<fragment>` transcript, as
  last-response does, and keeps what it found briefly (a lookup reads
  every project folder; a miss is kept only 4 s).
- A session Story Mode cannot draw is not polled, and a page with nothing
  drawn yet is polled like a finished one (every 15 s), not every 4 s.
- Helper steps: one request per helper is drawn, the newest; a failed
  refetch never writes over steps already shown.
- The Director's cut toggle, a skin change and the fonts arriving redraw
  within the frame budget, not every panel in one task.
- A bare name under an `ls` header finds its folder in one pass over the
  lines; a search per link over the text before it was quadratic (about
  1.5 s for 700 links on agent output).
- A page of many questions still keeps to 12 panels: questions fold last.
- Opening Story Mode while it is open never starts a second runtime; the
  status announcer carries data-i18n-skip; the turn key in the ETag is
  clipped.
- The crafted-input timing test runs at sizes where the old code took 6
  to 29 s and the new one under 10 ms, with a 1.5 s bound.
- Docs: `older`, `origin` (`scheduled`), which route answers a 500;
  mobile.css's stale comment; an orphaned doc comment.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/utils/claude-transcript.ts

@@ -47,6 +47,44 @@ export function claudeProjectsDir(configDir?: string): string {
   return join(configDir || fromEnv || join(homedir(), '.claude'), 'projects');
 }
 
+/**
+ * The one top-level transcript a recovered session (`restored-<first 8+ hex of its uuid>`, how
+ * reconcileSessions() names a session whose mux record was lost) belongs to, or null when none or
+ * more than one matches. The same recovery `last-response` makes (session-routes.ts).
+ */
+export async function findRestoredClaudeTranscriptPath(
+  codemanSessionId: string,
+  configDir?: string
+): Promise<string | null> {
+  const restored = /^restored-([a-f0-9]{8,})$/i.exec(codemanSessionId);
+  if (!restored) return null;
+  const fragment = restored[1].toLowerCase();
+  const uuid = /^[a-f0-9]{8}-[a-f0-9]{4}-[1-5][a-f0-9]{3}-[89ab][a-f0-9]{3}-[a-f0-9]{12}$/i;
+  const projectsDir = claudeProjectsDir(configDir);
+  let projectDirs: string[];
+  try {
+    projectDirs = await readdir(projectsDir);
+  } catch {
+    return null;
+  }
+  const found = new Map<string, string>();
+  for (const projectDir of projectDirs) {
+    let files: string[];
+    try {
+      files = await readdir(join(projectsDir, projectDir));
+    } catch {
+      continue;
+    }
+    for (const file of files) {
+      const id = file.endsWith('.jsonl') ? file.slice(0, -'.jsonl'.length) : '';
+      if (!id.toLowerCase().startsWith(fragment) || !uuid.test(id)) continue;
+      const path = join(projectsDir, projectDir, file);
+      if ((await stat(path).catch(() => null))?.isFile()) found.set(id, path);
+    }
+  }
+  return found.size === 1 ? [...found.values()][0] : null;
+}
+
 /**
  * Path of the transcript for `conversationId` under any project directory, or null. Unlike
  * {@link claudeTranscriptExists} it answers with the file (Story Mode reads it), so the id is