fix(chat): make cloud the only truth for charts, synastry, and pin/archive

Local fallbacks were creating fake saves and resurrecting deleted rows.
Pin and archive now live on chat_sessions so they follow the account.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_supabase_user_data_contract.py

@@ -126,7 +126,9 @@ def test_chat_page_uses_authenticated_cloud_persistence() -> None:
     assert "系统正在以账户记录为准同步点数" in source
     assert "回答中途断开，已保留现有内容，本次已计费。" not in source
     assert "本次已开始生成并计费" not in source
-    assert 'localStorage.setItem(chartLibraryStorageKey(accountId)' in source
+    # Former value: `localStorage.setItem(chartLibraryStorageKey(accountId)`
+    # wrote a local library copy on cloud save failure.
+    assert "localStorage.setItem(chartLibraryStorageKey(accountId)" not in source
     assert 'localStorage.setItem("chat_sessions"' not in source
 
 
@@ -180,19 +182,24 @@ def test_chart_profile_library_has_cloud_table_api_and_local_fallback() -> None:
         "draftSynastryQuestionFromChart",
         "synastryReportCard",
         "synastryHistory",
-        "synastryHistoryStorageKey",
+        "discardLegacyCloudMirrorKeys",
         "synastry-report-card",
         "synastry-history-list",
         'fetch("/api/synastry"',
         "Ashtakoot",
-        "chartLibraryStorageKey",
-        "Cloud chart library is best-effort",
+        "jyotisha_chart_library",
+        "保存失败，请重试",
         "星盘库",
         "添加其他星盘",
         "用于合盘",
         "设为默认",
     ):
         assert token in page
+    # Former values: synastryHistoryStorageKey, chartLibraryStorageKey,
+    # and the comment "Cloud chart library is best-effort".
+    assert "synastryHistoryStorageKey" not in page
+    assert "chartLibraryStorageKey" not in page
+    assert "Cloud chart library is best-effort" not in page
     assert "ayanam-profile" not in page
     assert "ayanam-sessions" not in page
 
@@ -251,11 +258,14 @@ def test_synastry_reports_are_cloud_persisted_per_user() -> None:
         "fetchCloudSynastryHistory",
         "saveCloudSynastryReport",
         'fetch("/api/synastry-reports"',
-        "writeSynastryHistory(accountId, next)",
+        "未能存入历史",
         "cloud_synastry_history_unavailable",
         "cloud_synastry_report_save_failed",
     ):
         assert token in page
+    # Former value: writeSynastryHistory(accountId, next) wrote a local
+    # history copy when cloud save failed.
+    assert "writeSynastryHistory(accountId, next)" not in page
 
 
 def test_consultation_credit_lifecycle_is_idempotent_and_server_only() -> None: