fix(calendar): persist settings on PUT/POST

Accept calendar.settings (e.g. week_patterns) in validate_update
and convert_field; apply on create like tags. Unblocks Front#42
pattern save which previously got 200 with empty settings.

test/api/users/user_calendar_by_id_tests.erl

@@ -23,6 +23,7 @@ test() ->
   test_get_calendar_unauthorized(CalId),
   test_get_calendar_not_found(Token),
   test_update_calendar(Token, CalId),
+  test_update_calendar_settings(Token, CalId),
   test_update_calendar_forbidden(OtherToken, CalId),
   test_delete_calendar(Token, CalId),
   test_delete_calendar_forbidden(OtherToken, CalId),
@@ -60,6 +61,26 @@ test_update_calendar(Token, CalId) ->
   ?assertEqual(<<"New desc">>, maps:get(<<"description">>, Updated)),
   ct:pal("    OK").
 
+test_update_calendar_settings(Token, CalId) ->
+  ct:pal("  TEST: Persist calendar.settings.week_patterns"),
+  Path = <<"/v1/calendars/", CalId/binary>>,
+  Settings = #{
+    <<"week_patterns">> => [
+      #{
+        <<"id">> => <<"pat1">>,
+        <<"name">> => <<"Mon-Fri">>,
+        <<"slots">> => [
+          #{<<"weekday">> => 1, <<"time">> => <<"10:00">>, <<"duration">> => 60, <<"title">> => <<"Open">>}
+        ]
+      }
+    ]
+  },
+  Updated = api_test_runner:client_put(Path, Token, #{settings => Settings}),
+  ?assertEqual(Settings, maps:get(<<"settings">>, Updated)),
+  Got = api_test_runner:client_get(Path, Token),
+  ?assertEqual(Settings, maps:get(<<"settings">>, Got)),
+  ct:pal("    OK").
+
 test_update_calendar_forbidden(OtherToken, CalId) ->
   ct:pal("  TEST: Update calendar by non-owner (403)"),
   Path = <<"/v1/calendars/", CalId/binary>>,