showSessionName only renders after a manual /rename — fallback reads "slug", but Claude Code now writes "ai-title" entries

Summary

display.showSessionName renders nothing until the user manually runs /rename. The fallback path reads a top-level slug field that current Claude Code no longer writes; the auto-generated session title now arrives as a dedicated {"type":"ai-title","aiTitle":"..."} transcript entry, which the parser ignores.

src/transcript.ts (v0.8.0, lines 558-561 and 760):

if (entry.type === 'custom-title' && typeof entry.customTitle === 'string') {
  customTitle = entry.customTitle;
} else if (typeof entry.slug === 'string') {
  latestSlug = entry.slug;
}
// ...
result.sessionName = customTitle ?? latestSlug;

custom-title is matched as an entry type, but the fallback matches slug as a top-level field — and nothing in a current transcript carries it.

Steps to Reproduce

1. Set display.showSessionName: true
2. Start a new session and let Claude Code generate its title
3. Look at the HUD — no session-name segment
4. Run /rename anything — the segment appears

Expected Behavior

The auto-generated session title shows without requiring a manual /rename.

Actual Behavior

The segment is absent for every session that was never renamed, so showSessionName: true looks like a no-op.

Evidence

Across 203 local transcripts (Claude Code 2.1.259, macOS):

• 89 files contain {"type":"ai-title","aiTitle":"..."}, spanning 2026-08-04 → 2026-09-03 (i.e. current and still being written)
• 2 files contain a top-level slug, both from 2026-08-08 / 2026-08-10 — and there it is a random word-triple (frolicking-enchanting-pebble, streamed-bubbling-knuth) carried as a field on system entries, not a dedicated entry type
• 53 files contain {"type":"custom-title","customTitle":"..."} — the only path that currently produces a visible name

Concrete case, a session where the HUD showed no name despite showSessionName: true:

{"type":"ai-title","aiTitle":"Claude-hud session display","sessionId":"8669b86d-..."}

After /rename test, the same transcript gained the following, and the segment appeared:

{"type":"custom-title","customTitle":"test","sessionId":"8669b86d-..."}
{"type":"agent-name","agentName":"test","sessionId":"8669b86d-..."}

Suggested Fix

Add aiTitle to the fallback chain, keeping slug for older transcripts:

result.sessionName = customTitle ?? aiTitle ?? latestSlug;

matched the same way custom-title is (entry.type === 'ai-title' && typeof entry.aiTitle === 'string').

Environment

• OS: macOS 26.6.2
• Bun 1.3.13 (Node v22.22.1 also installed)
• Claude Code version: 2.1.259
• claude-hud: 0.8.0 (same code path in 0.6.0, reproduced on both)