v0.5.4

Changes since v0.5.3:

1. AS11 settings EDF mapping fixes (edf_gen.c):

   • Added "Auto" → 3 to on_off_to_edf() for HeatedTubeSettingEnable
     and other On/Off/Auto enum fields. Fixes Temperature and
     Temperature Enable not displaying in OSCAR when set to "Auto".
   • Added "Off" → 0 for AutoSetComfort (S.AS.Comfort / Response).
   • Added "Full" → 1 for PatientView (S.PtAccess), treating it as
     a firmware rename of "Advanced".

2. SMB upload timestamp preservation (uploader_smb.c):

   • Added smb_set_mtime() — sends SMB2 SET_INFO with
     FILE_BASIC_INFORMATION to set remote file last_write_time
     and change_time to match the local file's mtime.
   • Called before smb2_close() so destination files retain
     original modification timestamps instead of upload time.

3. FAT32 rename / HTTP header fixes (uploader_state.c, sdkconfig.defaults):

   • Remove destination file before rename() to avoid FAT32 EEXIST
     errors on the uploader state file.
   • Increase HTTPD_MAX_REQ_HDR_LEN from 2048 to 4096 to accommodate
     Cloudflare Access proxy headers (cookies + JWT).