v1.0.4-beta.4

[1.0.4-beta.4]

Added

• WiFi connection failed popup — when the captive portal WiFi connection
  fails (wrong password, out of range, etc.), an error message now appears on
  the photo frame display with guidance to check the password or try a
  different network (30 s auto-dismiss)
• WiFi connection profile fallback — if the one-shot nmcli device wifi connect fails with a "key-mgmt property is missing" error (common on
  routers with mixed WPA2/WPA3 or certain TP-Link/ASUS models), the code
  now creates an explicit connection profile with WPA2-PSK settings and
  retries automatically
• Setup script channel prompt — asks for stable or beta channel
  before installing; stable pins to the latest non-prerelease v* tag,
  beta tracks the dev branch
• Setup script WiFi country prompt — asks for the regulatory domain
  (e.g. AU, US, GB) upfront alongside the channel choice; both
  answers are written to config.json for the Web UI

Changed

• Boot welcome delay eliminated — the network monitor no longer waits
  ap_timeout_seconds when a network is already connected at boot; the
  welcome message appears as soon as the slideshow is ready instead of
  60+ seconds later
• Captive portal error messaging — the WiFi failure popup on the frame
  display uses a single clean message instead of concatenating the raw
  nmcli error with boilerplate text

Fixed

• Setup script CRLF line endings — .gitattributes now enforces
  eol=lf for *.sh files; the setup script was renormalized so it
  runs correctly when downloaded from GitHub raw on a Pi