fix: v0.2.1 — chunked ChatGPT cookies and Claude project path

- Support __Secure-next-auth.session-token.0/.1 split cookies; ChatGPT
  now issues tokens that exceed the 4KB per-cookie limit and must be
  sent as two named chunks or the auth endpoint returns no accessToken.
  Add CHATGPT_SESSION_TOKEN_1 env var; update auth wizard instructions.

- Fix Claude conversations exported to wrong directory when project name
  is present in the listing but absent from the detail endpoint response.
  Explicitly propagate "project" alongside _-prefixed annotation keys.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

@@ -6,9 +6,12 @@
 
 # --- ChatGPT ---
 # How to get: open chatgpt.com in Chrome → F12 → Application tab
-# → Cookies → https://chatgpt.com → find "__Secure-next-auth.session-token" → copy Value
-# Token type: JWT (starts with "eyJ"). Typically valid for ~7 days.
+# → Cookies → https://chatgpt.com → find the two cookie chunks:
+#   __Secure-next-auth.session-token.0  (starts with "eyJ") → CHATGPT_SESSION_TOKEN
+#   __Secure-next-auth.session-token.1  (the remainder)     → CHATGPT_SESSION_TOKEN_1
+# Token type: JWE. Typically valid for ~7 days.
 CHATGPT_SESSION_TOKEN=
+CHATGPT_SESSION_TOKEN_1=
 
 # ChatGPT Projects (optional): comma-separated list of project gizmo IDs.
 # Project conversations are NOT included in the default /conversations listing.