[LBBS-148] net_imap: Soft assertion if APPEND used in non-selected state

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Details

This can happen when an IMAP connection is used for APPEND, where a mailbox is not currently selected. However, APPEND can be used in the non-selected state, so we should be passing the directory to the flag parsing APIs directly, rather than using the default imap->dir.

[2026-03-14 23:10:36.825]   ERROR[248616]: imap_server_flags.c:42 parse_keyword: Failed soft assertion !strlen_zero(directory)
[2026-03-14 23:10:36.826]   ERROR[248616]: backtrace.c:255 bbs_log_backtrace: Got 12 backtrace records
[2026-03-14 23:10:36.967]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  0: lbbs bbs_log_backtrace()
[2026-03-14 23:10:36.967]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  1: lbbs __bbs_assert_nonfatal()
[2026-03-14 23:10:36.967]   ERROR[248616]: backtrace.c:275 bbs_log_backtrace:  2: [0x7f5b510601ce] net_imap.so                                  bbs.h:452   __bbs_soft_assertion_failed()
[2026-03-14 23:10:36.968]   ERROR[248616]: backtrace.c:275 bbs_log_backtrace:  2: [       inlined] net_imap.so                    imap_server_flags.c:42    parse_keyword()
[2026-03-14 23:10:36.968]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  3: [0x7f5b51060a76] net_imap.so                    imap_server_flags.c:180   __parse_flags_string()
[2026-03-14 23:10:36.968]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  4: [0x7f5b51083d7d] net_imap.so                             net_imap.c:2521  handle_append()
[2026-03-14 23:10:36.968]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  5: [0x7f5b51099efd] net_imap.so                             net_imap.c:4805  imap_process()
[2026-03-14 23:10:36.968]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  6: [0x7f5b510a0aac] net_imap.so                             net_imap.c:5095  handle_client()
[2026-03-14 23:10:36.969]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  7: [0x7f5b510a0cda] net_imap.so                             net_imap.c:5129  imap_handler()
[2026-03-14 23:10:36.969]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  8: [0x7f5b510a0f4b] net_imap.so                             net_imap.c:5153  __imap_handler()
[2026-03-14 23:10:36.969]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace:  9: lbbs <unknown>()
[2026-03-14 23:10:36.969]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace: 10: [0x7f5b5403fea7] libpthread.so.0                   pthread_create.c:478   start_thread()
[2026-03-14 23:10:36.969]   ERROR[248616]: backtrace.c:279 bbs_log_backtrace: 11: [0x7f5b53f5facf] libc.so.6                                  clone.S:97    __GI___clone()

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