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>

src/providers/chatgpt.py

@@ -56,6 +56,7 @@ class ChatGPTProvider(BaseProvider):
     def __init__(
         self,
         session_token: str | None = None,
+        session_token_1: str | None = None,
         project_ids: list[str] | None = None,
     ) -> None:
         # Pass a curl_cffi session to the base class instead of a requests.Session.
@@ -82,6 +83,10 @@ class ChatGPTProvider(BaseProvider):
             )
         self._session_token = token
 
+        # Second chunk of the session token (ChatGPT splits large cookies into
+        # __Secure-next-auth.session-token.0 and .1 to stay under the 4KB limit).
+        token_1 = session_token_1 or os.getenv("CHATGPT_SESSION_TOKEN_1", "").strip() or None
+
         # Project gizmo IDs (g-p-xxx) whose conversations we'll fetch.
         # ChatGPT project conversations do not appear in the default
         # /conversations listing — they require explicit project IDs.
@@ -93,13 +98,24 @@ class ChatGPTProvider(BaseProvider):
         # Cache of project_id → display name (avoids re-fetching gizmo details)
         self._project_name_cache: dict[str, str] = {}
 
-        # Set the session cookie in the cookie jar
+        # ChatGPT now splits large session cookies into .0 / .1 chunks.
+        # Always send both named chunks; the server reassembles them.
         self._session.cookies.set(
-            "__Secure-next-auth.session-token",
+            "__Secure-next-auth.session-token.0",
             token,
             domain="chatgpt.com",
             path="/",
         )
+        if token_1:
+            self._session.cookies.set(
+                "__Secure-next-auth.session-token.1",
+                token_1,
+                domain="chatgpt.com",
+                path="/",
+            )
+            logger.debug("[chatgpt] Set both session cookie chunks (.0 and .1)")
+        else:
+            logger.debug("[chatgpt] Set session cookie chunk .0 only (no .1 configured)")
 
         # Set only Referer and sec-fetch-* headers for the auth exchange.
         # Origin is intentionally omitted: Chrome does not send Origin on